LTE-Lite User Manual - Jackson Labs Technologies, Inc.
Contents
1. J3 1PPS OUTPUT O 2014 Jackson Labs Technologies Inc RF OUTPUT EA gt E UN ay ay vl E a y e D a D Jackson Ke LTE Lite User Manual 2 3 3 Using the LTE Lite SMT Module Synthesized Frequency Output The following schematics show an example of how to use the un buffered synthesized RF output of the LTE Lite SMT Module Figure 2 11 Using the synthesized frequency output of the LTE Lite SMT Module ano epou Suruwezbo1g we sks uy y bur qeue cn XSWPOZSZON prone o3 uo iemod Hutinp MoT peTTnd Bi LMO 44 TId ange Suo 6 SR eq jou snu utd 4SI 10032010 E N ano Che ANdINO 38 HINAS D Ase anod he AU In00 SddT aNd HT NH i KH TAHOE i aman 7 JIndlno sadi ro BON EX 100 NI NI ET EI N 3S My sd9 Sad y gr a tono Nd9_OXL EX NI up NI ZEKO SZ 7HWL999999 97 F INVA Sdo A and YAE E _ nd Qi X ss io 100 NI ZHH9E ST 997 ano eee ae VINN T y aNd 13638 ANO A0 EX m KI m ZENB ZT ERCCECECE CT Net Ec dsl 10000010 zang L I 100 34 OXOL suyo 022 cu id T E x 100 NI 100 HIEN ZHAOT suo D S KZ EC We H TVS 8 ED AN 1135 0384 X901 wg H X SUYO 022 Lo ES 3 T NI ino 100 DM ZENG CNA Z CIS 0244 Ol ZHNOL 5 pe EE 40ND H Deg ec AN AAUNS JIno Sddi 100 100 100 Q3TSYSIQ D reg and e yO 201 ANS UN t y 9r Di vi D OCH2. Always use a UL certified properly installed Antenna Lightning suppressor on the antenna cable when mounting the GPS antenna Without proper Lightning Protection damage to equipment injury or death may result 1 2 3 Power Connections Make sure to connect the DC power to the device following the polarity indicated in Section 2 1 Do not reverse the power pins as this will cause serious damage to the circuit board 1 2 4 Environmental Conditions This instrument is intended for indoor use It is designed to operate at a maximum relative non condensing humidity of 95 and at altitudes of up to 4000 meters Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range 2 O 2014 Jackson Labs Technologies Inc Ja ck S on LTE Lite User Manual Labs Usage Instructions 2 1 Powering Up the Evaluation Board The LTE Lite Evaluation Board is essentially a plug and play product that only requires a power source and a GPS antenna to be connected to start generating highly accurate output frequency and 1PPS signals that are phase and frequency aligned to UTC USNO and thus allow NIST tracability To use the Evaluation Board simply plug in the power supply using the supplied USB cable plug in the antenna and wait about 15 minutes typically for the GREEN LOCK OK LED to light up to indicate that the unit is locked to UTC with better than 250ns phase accuracy and a frequency accuracy
3. 22 2014 Jackson Labs Technologies Inc Jackson LTE Lite User Manual 18 RF IN GPS Antenna RF 1575MHz L1 GPS signal input Connect to passive or active Input OdBm max Contains DC power GPS antenna OdB to 30dB supplied to VANT pin 20 for antenna gain 3 0V to 5 25V DC antenna amplifier power antenna DC power 19 GND4 Ground Ground Ground Connect all module grounds together 20 VANT DC Antenna Bias OV to 5V max Connect DC power for antenna Power Input power supply Typically 3 3V or SV This power pin is internally bypassed and connected via Bias T to the antenna RF pin 18 21 3 3VA 3 3V Power 3 3V 0 1V 0 2V 0 06A Main 3 3V DC Power Input Pin Input typical Internally bypassed 22 3 3VB 3 3V Power 3 3V 0 1V 0 2V 0 06A Main 3 3V DC Power Input Pin Input typical Internally bypassed 23 RESET Reset Input Pull to ground for gt 50ms to Pull to ground to manually reset initiate a system reset system Leave floating during normal operation 24 CLOCKOUT RF Synthesizer Do not pull low at any time This pin generates the ISP output and In 3 3V CMOS output Can drive synthesized RF output Pin 7 System up to 10mA ISP mode for indicates when this pin is active Programming factory use only Do not pull low externally to ISP mode avoid initiating ISP mode during initialization power on Can be buffered by external CMOS gate Output frequency is determined by FSO FS 1 FS2 pins 25
4. ZHWC et OXOL ZHWQC c ve Sc E H AONINOFAA NANO AONINOTHA Anen amp x JNdINO 48 AAZISAHINAS 404 SNOILdO ONIddUuLS WOLSISHH an INdINO AONHNOWYA CHZISHHINAS ONISN WIdNVXS O 2014 Jackson Labs Technologies Inc 16 LTE Lite User Manual Jackson 7 2 3 4 Adding a USB output to the LTE Lite SMT Module for NTP applications The following schematics show an example of how to connect a USB serial adaptor chip to the LTE Lite SMT Module to supply NMEA PVT status information and a 1PPS pulse to NTP applications Figure 2 12 Adding a USB output to the LTE Lite SMT Module HE 015 090 aNd az SN lt 0 x 9WN3z086 100LkHdoW 6n See SVLNIA A TO3eTnpsy AC CH i AOL ANY 69 090 1SG gN 09XN in ano a 090 ML Y L QN9 an9a q dSN INIW Tea 090 89 3 E gt ro NI 3H yaN9 INVA VAE E Der em ds 1000015 07138 0384 11350384 Z13S 0344 9NINYHL dNNEVM 3NLOV AJA NS 30 201 Waviv SONO al SA F 3 kx 1o DS a as aq Si a 2 o x ZE anan lo fo gr 8N _ A gt MVY Sd9 Sdd avo ano a er 090 Fr 19 d9_OXL g oo 000 OXXXX XL D Vat 5 oez Eck Ji e e MS ano i 6 E pas ecczzooo z x XOT 35 IER SSES pue sech BEY TUE x0 LEES
5. message on the serial output pin 14 3l ALARM Alarm output 3 3V CMOS Alarm output Goes high if hardware or software fault is detected 3 3V CMOS ALARM output Can be used to drive an LED with up to 10mA A hard or software fault has occured if this signal goes high 32 GND5 Ground Ground Ground Connect all module grounds together 2 4 Connecting a GPS Antenna 24 Connect the GPS antenna to the MMCX connector J4 shown in Figure 2 3 Alternatively the GPS antenna may be connected to the small U Fl coax connector on the LTE Lite SMT Module itself Do not use both antenna connectors at the same time as they are wired in parallel Please make sure to connect the GPS antenna prior to connecting the USB or power cable to the unit Caution use a Lightning Arrestor on your Antenna setup The unit will provide 3 3V DC to the external antenna with up to 60mA of current The LTE Lite Evaluation Board GPS receiver includes a 65 channel high sensitivity GPS receiver with very fast lock time that supports QZSS WAAS EGNOS MSAS Satellite Based Augmentation Systems SBAS By default a self survey position hold mode auto survey establishes the antenna position over the first 2000 fixes after which the unit only requires a single satellite in view to operate properly or it can be used in mobile platforms by disabling the Auto Survey mode by inserting a jumper between pins 1 and 2 of the three pin header J
6. rom Cc SEI Lsy e EE E xH beer n HL eono VON LX x ON amp LA aen ano EE nore E da ae 9 oa FEROX d X 20088228 ou z oo 19 an Fin 92589829 o 2 aye SERIES sn Mr LAdLAO diN SddT ANY YAWN You HOVHAAINI gen V S9NILOWNNOO p d IdNWVX4 17 2014 Jackson Labs Technologies Inc LTE Lite User Manual J a ck S on Labs 2 3 5 SMT Module Power Connection The LTE Lite SMT Module is powered by an external 3 3V power supply with 0 15V and 0 25V range on pins 21 and 22 of the module The module typically draws less then 60mA of current The module also supplies pin 20 for antenna power biasing and this pin is typically connected to the external 3 3V power supply or it may be alternatively connected to 5V power supplies for 5V antenna systems All three power pins are internally bypassed for noise filtering The module generates a low noise low pass filtered 3 0V internal power rail for the TCXO DAC s and other sensitive circuits and this power rail is available on pin 10 of the module for optional additional bypassing and powering external circuitry such as optional external TCXO s or buffer IC s with a low noise 3 0V power rail No noise should be injected into this power rail as that may adversely affect the RF signal quality The 3 0V output may source up to 50mA 2 3 6 SMT Module Antenna Connection The LTE Lite SMT Module has an internal U Fl coax antenna connector that is connected in parallel to pin 18 of
7. 19 2MHz and 20MHz 7 PHASELOCK Indicates Phase 3 3V CMOS indicates Indicates readiness of the RESET Lock of internal PHASE LOCK OV indicates synthesized RF outputon the Synthesizer unit is not ready yet Goes high CLOGKOUT pin 24 can be used as y y yet 8 a generic RESET signal by external typically 1 second after system user circuitry as it stays low for about reset 1 second then goes high and stays high after system power on or system reset 8 DISABLE Disables Internal Pull high to disable internal Pulling this pin high disables the TCXO TCXO and output TCXO Internally pulled to internal TCXO and output buffer ground buffer and allows an external oscillator to feed RF into pin 6 for disciplining of external oscillators 9 GND2 Ground Ground Ground Connect all module grounds together O 2014 Jackson Labs Technologies Inc 21 LTE Lite User Manual kson Jac son ss 10 3 0V Out 3 0V output of 3 0V 0 1V can supply up to This pin connects to the internal internal Low 50mA Low Noise Low Dropout 3 0V Noise Linear Linear Regulator Can be used to regulator attach optional external bypassing caps for lower noise or to power external 3 0V TCXOs or buffers 11 NMEA Hai Selects NMEA Pull to ground to initiate 5Hz Pulling this pin low initiates 5Hz 5Hz output Rate GPS NMEA output rate NMEA GPS fix outputs Leave 1Hz 5Hz Leave floating for 1Hz rate floating for defau
8. Function Specification Usage 1 EFC Output External Oscillator OV to 3 0V 4 6K Ohms output Connect to frequency control input of EFC control impedance optional external oscillator 2 NC No Connect Do Not Connect Do Not Connect 3 INIT_SURVEY Initiates an Auto Pull to ground to activate internally Pulling this pin low manually initiates Survey process pulled up an Auto Survey process when in Timing GPS mode 4 1PPS OUT 1PPS Signal 3 3V CMOS 1PPS Output can This 1PPS output signal is aligned to Aligned to UTC drive up to 10mA UTC GPS and has very low jitter It is generated by the TCXO and will be active asynchronously if the GPS receiver has not had a GPS fix after power on and it will continue to be generated in GPS holdover mode 5 GND1 20MHz output return Ground Electrical Ground return for the 20MHz RF output pin 6 RF OUT IN 19 2MHz 20MHz 3 3V CMOS can supply up to By default this pin is a buffered RF Output from 24mA buffered TCXO output version of the internal TCXO RF TCXO default or by default output This pin becomes a RF input External 3 3V CMOS or TTL input when Geer Se S gei ine TCXO option internal TCXO is disabled by interna by pulling pin amp high lli in 8 hieh Must be bet In external TCXO mode this pin Siete RN di S n ween receives the RF output of the external MON to SEP maz on this pin shen Oscillator Allowable frequencies for driving from external sources external oscillator mode 10MHz 15 36MHz
9. h 2480 pts TimePod 5330A 2014 Jackson Labs Technologies Inc LTE Lite User Manual Ja ck S on Labs 2 1 6 Evaluation Board Mechanical Dimensions Figure 2 6 Mechanical dimensions CH lt GN i p NI Oo Fr mo Nan 1PPS OUT RESET ALARM SURVEY CLOCKOUT ANT IN 1 6 OO mm CR IW S 5 TN o 3 Sisa Oe oe J5 17 m a d CT IL v z zle 1 08 re Se z z 3 z ze Ri bail ef Be iss la ze j M Seer EXTERNAL TCXO OPTION 65 OS T zi Mop e e e 53 BR on m m ojo emm 2 nu Qu um 595 start AUTO SURVEYS mim EXT ON z A S 3 5V ALTERNATE POWER A 25 Jackson Labs Technologies Inc m s LTE LITE EVAL BOARD 3 3 O 20t RE 200 2 730 2 950 8 2014 Jackson Labs Technologies Inc Ja ck S on LTE Lite User Manual Labs 2 1 7 LTE Lite SMT Module Mechanical Dimensions Figure 2 7 Mechanical dimensions of the LTE Lite SMT Module f PAD SIZE 35 X 50 MIL 32 PLACES PIN 1 PIN 32 915 969 865 815 765 715 665 615 565 515 465 415 365 315 265 mo 215 Pr maa D PIN 1 PIN 17 mumum 0 Ou NO D RO O on VIEWED FROM TOP VIEWED FROM TOP 2 1 8 LTE Lite Evaluation Board Schematics The following schematics may be used as an example of how to connect the LTE Lite SMT Module and to maximize the features of
10. of better than 1ppb has been achieved The internal software will auto configure and auto calibrate the unit without any user interaction and the longer the unit runs the more accurate it will become For units with a Timing GPS receiver the unit will start an Auto Survey process to establish the stationary antenna position as soon as power is applied and this is indicated by the SURVEY LED on the Evaluation Board The Auto Survey process will take at least 2000 seconds to finish at which time the antenna position is stored in internal memory and operation with 1 satellite is possible 4 sats are required for Mobile mode non Position Hold operation The Evaluation Board is powered directly from the USB cable and or from an optional external 5V DC source on the 5V header The USB cable and the external 5V DC source may be connected at the same time as they are diode protected from one another The current is typically less than 0 07A at 5V Connect a clean 5V power supply to the 5V header block if the USB cable is not going to be used or is plugged in intermittently See Figure 2 3 for the proper polarity of the optional external 5V DC power connection Reversing the polarity on the power connector will not damage the unit as it is diode reverse polarity protected When communicating to the unit through the USB cable Windows Vista Windows 7 8 and Linux will auto recognize the unit as a USB serial COM adaptor and automatically assign a serial
11. port to the unit Windows will automatically load the USB COM driver for the board and may need to have access to the Internet to download the latest driver from the Microsoft update website The user can verify the COM port that windows assigned to the unit under the Computer Management window right click on computer and press the MANAGE button under Windows 7 or go to Control Panel Computer Management The unit should show up as a standard serial port adaptor under the Ports COM amp LPT Icon Please note the COM port number as it is required for the initialization of application software 2014 Jackson Labs Technologies Inc 3 LTE Lite User Manual Ja ck S on Labs The unit will start to search for satellites as soon as power is applied and will start to lock the internal TCXO to UTC as soon as a GPS antenna is attached and more than 4 sats become visible After 30 minutes or less the unit should stabilize the frequency and all ALARM indicators should be off resulting in the Green LOCK OK LED to be lit up At this time the Green LED will indicate the unit is fully synchronized to UTC and generating a stable and accurate 20MHz 19 2MHz 10MHz output signal The Green LED may go off momentarily from time to time as airflow touches the unit or sats come in and out of view this is normal behavior You may place the GPS antenna in a window but it is recommended to place the GPS antenna with a full view of the sky for be
12. thus all bits are orthogonal to each other and can be easily decoded The definition of the health parameter is as follows If the TCXO coarse DAC is maxed out at 255 HEALTH STATUS l 0x1 If the TCXO coarse DAC is mined out at O HEALTH STATUS l 0x2 If the phase offset to UTC is gt 250ns HEALTH STATUS Iz 0x4 If the run time is 300 seconds HEALTH STATUS 0x8 If the GPS is in holdover gt 60s HEALTH STATUS Iz 0x10 If the Frequency Estimate is out of bounds HEALTH STATUS Iz 0x20 If the TCXO voltage is too high HEALTH STATUS 0x40 26 2014 Jackson Labs Technologies Inc Jackson Ke LTE Lite User Manual If the TCXO voltage is too low HEALTH STATUS l 0x80 For the first 2 minutes after a phase reset or a coarse DAC change HEALTH STATUS l 0x200 2014 Jackson Labs Technologies Inc 27 LTE Lite User Manual Jackson 28 O 2014 Jackson Labs Technologies Inc Ja ck S on LTE Lite User Manual Labs Certification and Warranty 3 1 Certification Jackson Labs Technologies Inc certifies that this product met its published specifications at time of shipment 3 1 1 Warranty This Jackson Labs Technologies Inc hardware product is warranted against defects in material and workmanship for a period of 1 one year from date of delivery During the warranty period Jackson Labs Technologies Inc will at its discretion either repair or replace produ
13. 1 LTE Lite Evaluation Board connectors buttons switches and LEDs Ref Name Function Specification Pinning Usage JP2 5V Optional External 5V DC 20 lt 0 08A lt 10mVac Pin close to USB connector 5V 5V Supply Use Pin close to Mounting Hole GND when USB power supply is not available J3 Position Hold Selects if the unit is Open default Auto Survey mode Insert a jumper between Pin 1 to Pin Mode or Mobile used in stationary with Position Hold function is 2 to disable Auto Survey mode Only Mode selector mode or mobile enabled change this jumper with power to the mode Jumper Inserted Auto Survey mode unit being turned off is disabled and Mobile 3D mode is selected WARNING DO NOT CHANGE THE WARNING DO NOT CHANGE THE SETTING OF THIS JUMPER WITH SETTING OF THIS JUMPER WITH POWER APPLIED TO THE UNIT POWER APPLIED TO THE UNIT THIS MAY CORRUPT THE FLASH THIS MAY CORRUPT THE FLASH OF THE GPS RECEIVER OF THE GPS RECEIVER PERMANENTLY PERMANENTLY J2 20MHz 10MHz Buffered RF output 3 0V CMOS 20MHz 10MHz or Center RF Output Shield GND or 19 2MHz from internal TCXO 19 2MHz Output can drive up to CMOS Out 24mA Frequency depends on TCXO selection J1 1PPS CMOS Out 1PPS Signal 3 3V CMOS 1PPS Output can Center 1PPS Output Shield GND Aligned to UTC drive up to 10mA U3 USB Port Supplies Power and Standard USB 2 0 Full Speed Mini USB NMEA output strings J5 Synthesized RF Un buffered output 3 3V
14. 3 with the unit powered off The LTE Lite Evaluation Board GPSDO is capable of generating a number of standard navigation messages that are compatible with most GPS based navigation software and are sent to the USB port Alternatively a toggle switch can be used to select a NMEA style proprietary oscillator status and health string The GPS NMEA output can be generated in 1Hz default or 5Hz insert 5Hz jumper into JP1 update rates The GPS receiver generates a 1PPS time signal that is phase synchronized to UTC This 1PPS signal is used to frequency lock the TCXO output of the unit to UTC thus disciplining the unit s 2014 Jackson Labs Technologies Inc Ja ck S on LTE Lite User Manual Labs 20MHz 19 2MHz 10MHz frequency output to the US Naval master clock for very high frequency accuracy typically better than 1ppb of frequency accuracy when locked to GPS Over the long term the LTE Lite Evaluation Board GPSDO will out perform free running Cesium Atomic Frequency Standards 2 5 USB serial connection The unit outputs strings to the USB Serial port at 38400 baud 8N1 The unit cannot receive serial data and ignores serial data sent to it e The unit supplies a 1PPS signal to the DCD pin of the USB port which can be used to synchronize programs such as NTP or GPSD Connect the PC via the USB cable and connector attaching the LTE Lite Evaluation Board to your PC s Hyperterminal TeraTerm or a NMEA compatible program suc
15. CMOS can supply up to Center RF Output Shield GND output of internal PLL 10mA frequency selected via Synthesizer three jumpers J4 Antenna In GPS Antenna GPS 1575MHz antenna input Center RF Output Shield GND Input supplies DC 3 3V to antenna with up to 60mA current SWI NMEA Status Selects if either For GPS NMEA output 38 4K Left GPS NMEA Selector Switch GPS NMEA data Baud 8N1 supported sentences Right Oscillator Status or an Oscillator GGA GLL GSA GSV RMC Status sentence is VTG ZDA sent to USB port For Status output 38 4K Baud 8N 1 oscillator and system health status string Proprietary NMEA sentence O 2014 Jackson Labs Technologies Inc 11 LTE Lite User Manual Jackson SW2 External TCXO Disables internal Down setting external DIP 14 Up Internal TCXO Selector TCXO andselects TCXO supplied with 3 3V and Down External TCXO optional external OV to 3 0V EFC range TTL or DIP 14 TCXO CMOS output 10 15 36 19 2 20MHz TCXO SW3 ISP Mode Enables In Factory Use Only Factory Use Only Set to Right Selector System setting NORM for board to Programming operate properly ISP mode S1 Init Auto Initiates a Press button for 1 seconds to Press button for 1 seconds until Survey Position Auto manually initiate an Auto SURVEY LED lights up Survey Survey process S2 RESET System Reset Press button momentarily Initiates a System Reset LE
16. D D5 SURVEY LED Lights up during Lights up for 2000 or more Lights up during Auto Survey Auto Survey seconds after power on to process indicate Auto Survey is in process LED D6 LOCK OK Indicates No Lights up when oscillator is Lights up when unit is healthy Events are locked to UTC via GPS and locked to GPS Extinguishes pending and receiver and no events are when a hardware or software oscillator is pending Events are event is pending no GPS signal locked individually shown in the status is received or the unit is not yet serial string sentence locked to GPS UTC LED D7 WARMUP Indicates unit is Lights up for one or more Indicates unit is warming up still in warmup minutes after power on mode LED D8 ALARM Indicates a Lights up when a hardware fault Lights up during Alarm hardware fault or or software alarm has been conditions software alarm detected GPS GPS Status Power and GPS Lights up when power is Blinks when GPS fixes are LED LED Fix indicator applied and blinks when GPS properly being received and unit fixes are being received is powered on Resides on LTE Lite SMT module near antenna connector 12 2014 Jackson Labs Technologies Inc ksony Jac son T LTE Lite User Manual JP1 Debug Connector Debug status Synthesizer Frequency selector 1Hz 5Hz NMEA selector Raw 1PPS output RESET output signal Pins 9 10 and 11 Insert jumpers Pins 12 and 13 CMOS 3 3V output of GPS 1PPS and GP
17. FREQ SELO Frequency Select Pull to ground to activate 0 Frequency select 0 Pulling this 0 LSB Leave floating 1 pin low activates one of the syntheziser output frequencies 26 FREQ SELI Frequency Select Pull to ground to activate 0 Frequency select 1 Pulling this 1 Leave floating 1 pin low activates one of the syntheziser output frequencies 27 FREQ_SEL2 Frequency Select Pull to ground to activate 0 Frequency select 2 Pulling this 2 MSB Leave floating 1 pin low activates one of the syntheziser output frequencies 28 WARMUP_ TCXO Warmup 3 3V CMOS warmup OV 3 3V CMOS output indicating TRAINING Indicator warmup done TCXO warmup after power on Can drive an LED with up to 10mA Stays high for about 1 minute after reset 2014 Jackson Labs Technologies Inc 23 LTE Lite User Manual Jackson 29 SURVEY Active Auto Survey Active Indicator 3 3V CMOS Auto Survey Active OV Auto Survey finished Indicates the status of the Auto Survey process Can be used to drive an LED with up to 10mA Stays high for the duration of the Auto Survey process 30 LOCK OK LOCK OK No E vent indicator 3 3V CMOS LOCK OK 0V Event Pending LOCK OK indicator Goes low if any event is pending Stays high if the unit is locked to GPS and no events are pending Can be used to drive an LED with up to 10mA If indicated events can be checked in the JLT Proprietary Status output
18. LTE Lite i User Manual ocument 80200522 LTE Lite User Manual Copyright 2013 2014 Jackson Labs Technologies Inc Ja ck S on LTE Lite User Manual Labs 1 Introduction 1 1 Overview e 1 2 General Safety Precautions 2 1 2 1 Grounding m 1 2 2 Antenna Lightning Protection 2 1 2 3 Power Connections 2 1 2 4 Environmental Conditions 2 2 Usage Instructions 3 2 1 Powering Up the Evaluation Board 3 2 1 1 Airflow Warning 4 2 1 2 Supplied Accessories 5 2 1 3 USB Serial Port 5 2 1 4 Major connections 5 2 1 5 Typical Phase Noise and ADEV Plots 6 2 1 6 Evaluation Board Mechanical Dimensions 8 2 1 7 LTE Lite SMT Module Mechanical Dimensions 9 2 1 8 LTE Lite Evaluation Board Schematics 4 0 de We ede e 2 2 Connector Buttons and Switches on the Evaluation Board Sow hebes xx hk 2 3 LTE Lite SMT Module usage UG Ww zh Det Re ke aS 2 3 1 LTE Lite SMT Module Minimum Required Setup a e 2 3 2 Using the LTE Lite SMT Module with external TCXOs 2 2 5 14 2 3 3 Using the LTE Lite SMT Module Synthesized Frequency Output 2 416 2 3 4 Adding a USB output to the LTE Lite SMT Module for NTP Beete eae lf 2 3 5 SMT Module Power Connection 2 5e lB 2 3 6 SMT Module Antenna Connection 18 2 3 7 1PPS Module outputs RE IO 2 3 8 Synthesized RF Output Frequency E E 2 3 9 System Reset Lu LE 27M 2 3 10M
19. ND FITNESS FOR A PARTICULAR O 2014 Jackson Labs Technologies Inc 27 LTE Lite User Manual Ja ck S on Labs PURPOSE No license express or implied by estoppel or otherwise to any intellectual property rights is granted by this document Jackson Labs Technologies Inc products are not intended for use in medical life saving or life sustaining applications 3 1 3 Exclusive Remedies THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES JACKSON LABS TECHNOLOGIES INC SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY 28 2014 Jackson Labs Technologies Inc
20. S TXD Pin 14 Insert jumper for 5Hz NMEA output Pin 15 Indicates when synthesizer is phase locked can be used as a RESET signal to other circuits Pin 16 3 3V 50mA max Insert jumpers between Pins 9 and 8 10 and 7 11 and 6 to select synthesized output frequency Insert jumper between pin 14 and 3 Pin 15 standard 3 3V CMOS level RESET output signal with up to 1s reset active low 2 3 LTE Lite SMT Module usage The LTE Lite SMT Module by itself is designed to be soldered into a customer PCB using standard SMT pick and place procedures The SMT module is designed as a 0 032 inches thin single sided PCB with 32 castellated solder pads on the bottom and on the sides of the module It is recommended that the users PCB has a filled ground plane under the SMT module and does not contain any traces under the SMT module to avoid cross talk into signals inside the module It is also recommended that the users PCB has a solid silkscreen layer under the SMT module to generate insulation between the SMT module and the users PCB Soldering can be done manually or using standard reflow oven soldering procedures The module can be soldered onto the customers PCB using lead or RoHs procedures The LTE Lite SMT module is moisture sensitive and it must be pre baked before reflow soldering to avoid damage to the internal IC s from moisture absorbtion Pre bakeing should be done at 110 Degrees C maximum for 24 hours prior to
21. cies that are multiples or integer fractions of the TCXO frequency may be generated and output on the 3 3 V CMOS RF output pin 24 This pin is not buffered and can supply only up to 10mA of output current PLEASE NOTE THAT THE SYNTHESIZED OUTPUT PIN 24 IS ALSO USED AS THE ISP ENABLE PIN DURING AND AFTER SYSTEM RESET AND THIS PIN MUST THUS NOT BE PULLED LOW DURING RESET OTHERWISE THE BOARD WILL NOT FUNCTION PROPERLY THE SYNTHESIZED RF OUTPUT PIN 24 SHOULD THUS BE BUFFERED BY A CMOS HIGH IMPEDANCE INPUT GATE WITHOUT ANY PULL DOWN RESISTORS IN THE CIRCUITRY 18 2014 Jackson Labs Technologies Inc ksor Jac son Ke LTE Lite User Manual The synthesized frequency is generated by a PLL circuit inside the microprocessor and uses a VCO to generate the reference frequency Due to the nature of the VCO PLL circuit the phase noise and spurs of this output are higher than the TCXO generated RF output The output frequency will be phase locked to the TCXO frequency and thus to UTC GPS Due to the synthesizer being software controlled the synthesized output will take up to 1 second typically to appear on the output pin An external PHASE LOCK indicator pin 7 on the module indicates when the synthesized output frequency is stable and this output signal can be used by external circuitry as a generic CMOS RESET signal Frequency selection is done by three internally pulled up strap pins on the module pins 25 26 and 27 and leaving these pins un
22. connected causes the synthesized output to be disabled for lower power consumption and reduced EMI noise The synthesized output frequencies depend on the TCXO frequency that is used on the module Table 2 2 shows the available output frequency selections based on the TCXO frequency and the required resistor straps for the desired synthesized frequency Leaving an FS strap pin unconnected results in a 1 high state and pulling it to ground results in a O low state Table 2 2 Synthesized Output Frequency versus Resistor Straps and TCXO Frequency FS2 FS1 FS0 10 MHz TCXO 15 36 MHz TCXO 19 2 MHz TCXO 20 MHz TCXO 111 disabled disabled disabled disabled 110 5MHz 4 608MHz 4 8MHz 5MHz 101 13 33333333MHz 10 24MHz 9 6MHz 10MHz 100 16MHz 15 36MHz 12 8MHz 13 33333333MHz 011 20MHz 23 04MHz 15 36MHz 16MHz 010 26 66666667MHz 30 72MHz 25 6MHz 26 66666667MHz 001 40MHz 46 08MHz 38 4MHz 40MHz 000 80MHz 92 16MHz 76 8MHz 80MHz 2 3 9 System Reset The LTE Lite SMT Module contains internal reset circuitry and thus does not require an external reset input Pin 23 of the module is an open collector reset input that can be pulled to ground to initiate a manual system reset of the module This pin is typically left un connected or it can be connected to a reset switch Initiating a system reset will cause the GPS receiver to not generate GPS fixes for up to 35 seconds if power had been off for prolonged periods of t
23. cts that prove to be defective Jackson Labs Technologies Inc does not warrant that the operation for the software firmware or hardware shall be uninterrupted or error free even if the product is operated within its specifications For warranty service this product must be returned to Jackson Labs Technologies Inc or a service facility designated by Jackson Labs Technologies Inc Customer shall prepay shipping charges and shall pay all duties and taxes for products returned to Jackson Labs Technologies Inc for warranty service Except for products returned to Customer from another country Jackson Labs Technologies Inc shall pay for return of products to Customer If Jackson Labs Technologies Inc is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Jackson Labs Technologies Inc 3 1 2 Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse opening of the instruments enclosure or removal of the instruments panels operation outside of the environmental or electrical specifications for the product or improper site preparation and maintenance JACKSON LABS TECHNOLOGIES INC SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY A
24. h as the uBlox u center application Please initialize your PC application software to the proper COM port automatically assigned by Windows and configure the application software for 38400 Baud 8 bits no parity 1 stop bit and no flow control where applicable 2 5 1 Proprietary PSTI NMEA GPS Status Sentence When in timing mode the GPS receiver NMEA serial status output sentences contain a timing status message in NMEA proprietary format This PSTI message is encoded as follows PSTL00 1 1985 12 4 1E Proprietary Message String ID 00 Timing Mode Survey Length in 1PPS fixes 1PPS Quantization Error in ns NMEA compatible checksum The Timing Mode parameter field is encoded as follows 0 PVT Mode 1 Survey Mode 2 Static Position Hold Mode 2 5 2 JLT Proprietary STATUS Output Sentence Selecting the STATUS setting on toggle switch SW1 will enable the JLT proprietary NMEA style oscillator status and health output string to be sent to the USB port The string has the following exemplary format PJLTS 0 33 31 15 189 2 1 6970169 56 5672 1 6E 8 0 7 0x228 44 PJLTS 1 35 31 15 190 2 1 6970190 56 5672 1 6E 8 0 7 0x228 60 The fields of this status string are encoded as follows PJLTS 1 35 31 15 190 2 1 6970190 56 5672 1 6E 8 0 7 0x228 60 JLT Proprietary Status String ID filtered UTC offset in ns raw UTC offset in ns number of captured 1PPS pulses lock status EFC voltage EFC percentage 0
25. ime and down to 3 seconds typically if the unit had been powered on recently 2014 Jackson Labs Technologies Inc LTE Lite User Manual Jackson 2 3 10 Module Serial IO pins The LTE Lite module supports three individual serial port pins Two of these are directly connected to the internal microcontroller pin 12 RXD CPU and pin 14 TXD CPU and one is directly connected to the GPS receiver on the module pin 13 TXD GPS Due to only having a single serial port on the microcontroller that needs to be used for both GPS receiver initialization and monitoring as well as external communications and In System Programming ISP the microcontroller serial port is connected to both the internal GPS receiver and external USB chip The output TXD signal of the microcontroller is thus connected to the GPS serial port input pin and the USB serial port input pin The input RXD signal of the microcontroller is connected to the GPS serial port output pin with a 2 7K Ohms series resistor and to the USB serial port transmit pin via switch SW3 on the evaluation board This allows the GPS receiver to send NMEA serial information to the microcontroller during normal operation and allows the USB chip to drive the microcontroller serial receive input during ISP communications by over driving the signal that the GPS receiver is sending to the microcontroller The user only needs to use the microcontroller serial output transmit pin 14 for oscillato
26. it is supplied with a USB cable and matching wall wart power supply two MMCX to BNC adaptor cables a GPS antenna and a quick start guide The unit provides an industry standard NMEA GPS serial output that is enabled by default and provides Position Velocity Timing PVT information and also provides a UTC synchronized 1PPS signal on the USB serial port DCD pin for NTP applications The LTE Lite GPSDO also provides a NMEA compatible proprietary status message on a secondary serial port that sends oscillator lock status as well as health status information to a users system 2014 Jackson Labs Technologies Inc 1 LTE Lite User Manual Ja ck S on Labs 1 2 General Safety Precautions The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Jackson Labs Technologies Inc assumes no liability for the customer s failure to comply with these requirements 1 2 1 Grounding To avoid damaging the sensitive electronic components in the LTE Lite GSPDO kit or board always make sure to discharge any built up electrostatic charge to a good ground source such as power supply ground This should be done before handling the circuit board or anything connected to it 1 e the GPS antenna 1 2 2 Antenna Lightning Protection
27. l rather than digital phase adjustments of a free running low cost crystal resulting in many orders of magnitude less jitter and Phase Noise The LTE Lite GPSDO is available as an SMT module or mounted onto the LTE Lite Evaluation Board with easy access to relevant signals via a host of connectors and switches The LTE Lite GPSDO and LTE Lite Evaluation Board include a high performance GPS QZSS receiver that can acquire and track up to 65 GPS signals down to a state of the art 165dBm a 32bit processor a low noise 3V CMOS 10MHz 19 2MHz or 20MHz output two 3 3V CMOS 1PPS outputs TTL or USB status and Position Velocity and Time PVT interface precision voltage references power filters and DACs It generates a low noise 10 19 2 20MHz signal with typically better than 1E 09 precision and accuracy 1ppb better than typ 135fs jitter 100Hz to 2MHz and a 1PPS signal with typically better than 25ns stability when locked to GPS The LTE Lite GPSDO provides status information on TTL output lines that can directly drive LEDs and has two serial output ports for NMEA PVT and Oscillator status output All configuration of the LTE Lite GPSDO is done via pull down TTL straps with built in pull up resistors so no software configuration driver is needed on the users system The evaluation kit may be operated and powered from the built in USB port or an optional 5V power supply and both power sources may be connected simultaneously The evaluation k
28. lt 1Hz output rate 12 RXD CPU RXD serial port 3 3V CMOS input This pin is internally connected input of internal to the GPS receiver TXD output microprocessor via a 2 7K Ohms resistor Leave unconnected used for factory purposes 13 TXD GPS TXD serial output 3 3V CMOS TXD serial output from GPS from GPS receiver Contains various receiver NMEA messages in 38 4K Baud 8N1 format Do Not connect directly to RS 232 levels 14 TXD_CPU TXD serial output 3 3V CMOS Serial data output from internal from internal microprocessor Contains the microprocessor JLT proprietary status and health NMEA like sentence 15 PPS_GPS_ GPS receiver 3 3V CMOS synchronized to Raw GPS 1PPS output signal RAW 1PPS output UTC GPS Contains sawtooth generated directly by GPS error receiver Not sawtooth corrected 16 MOBILE Initiates Mobile Pull to ground to initiate Mobile Pulling this pin low causes the 3D GPS mode GPS mode and disable Auto internal GPS receiver to boot up Survey Position Hold mode the mobile GPS mode 3D WARNING DO NOT CHANGE THE mode disabling the Position SETTING OF THIS PIN WITH Hold Auto Survey feature Leave POWBRAFPLIED TO THE UNIT floating for Timing GPS receiver THIS MAY CORRUPT THE FLASH OF THE GPS RECEIVER mode PERMANENTLY WARNING DO NOT CHANGE THE SETTING OF THIS PIN WITH POWER APPLIED TO THE UNIT THIS MAY CORRUPT THE FLASH OF THE GPS RECEIVER PERMANENTLY 17 GND3 Ground Ground Ground Connect all module grounds together
29. n Labs Technologies Inc Jackson 7 LTE Lite User Manual which then allows feeding an external 3 3V CMOS or TTL RF signal into the RF pin 6 of the module The former RF output pin 6 of the module becomes an RF input pin when pulling pin 8 of the module high The module TCXO Disable pin 8 is pulled low internally to the module to allow the internal TCXO to operate by default Allowable external frequencies are 10MHz 15 36MHz 19 2MHz and 20MHz Additional frequencies may be supported by the firmware at a later date External oscillators can be disciplined directly by the modules EFC output pin 1 and should have 50K Ohms or higher resistance to ground on their EFC pins The EFC output pin 1 has a voltage range of OV to 3 0V an requires external oscillators with positive frequency slope Figure 2 10 Connecting an external TCXO to the LTE Lite SMT Module 32 Ex ov 2 GND Q tuF 25V C5 E 26 X 25 X 24 3 3V 23 122 21 d 20 4 19 el 18 17 gt GND5 ALARM LOCK_OK U3 EFC NC INIT_SURV SURVEY ACTIVE 1PPS OUT CLOCKOUT ER RESET FREQ SEL FREQ SELO WARMUP TRAINING FREQ SEL2 NMEA 1Hz 5Hz RXD CPU TXD GPS PPS GPS RAW GND1 10MHz IO PHASE LOCK DISABLE TCXO GND2 30V OUT TXD CPU 1 CONNECTING AN EXTERNAL TCXO EXAMPLE 2 EFC 2 een 1PPS OUT 5 6 3 yt SE SE SEH 6 A MOBILE GND LTE Lite 2
30. odule Serial lO pins 20 2 3 11Module lO Pinout 20 2 4 Connecting a GPS Antenna 24 2 5 USB serial connection iow uen de ox e d Ren ds s e NEO 2 5 1 Proprietary PSTI NMEA GPS Status Sentence c 2 5 2 JLT Proprietary STATUS Output Sentence 25 2 5 2 1 Lock Status Definition 26 2 5 2 2 Health Status Definition 26 3 Certification and Warranty 27 3 1 Certification s s x e ll ll 27 3 1 1 Warranty ai AE od A md cd ir 427 3 1 2 Limitation of Warranty 3 1 3 Exclusive Remedies 28 2014 Jackson Labs Technologies Inc 1 LTE Lite User Manual Jackson 11 O 2014 Jackson Labs Technologies Inc Ja ck S on LTE Lite User Manual Labs Introduction 1 1 Overview The LTE Lite GPSDO is a very low cost small SMT Timing and Frequency reference module for high volume Small Cell applications It is intended to provide precise timing and a very low Phase Noise and jitter frequency reference to RF Transceivers and Base Band processors as typically used in Small Cell applications The LTE Lite is a true GPSDO rather than a Numerically Controlled Oscillator using true precision analog disciplining of the high end Crysta
31. ple Accessories 2 1 3 USB Serial Port The LTE Lite Evaluation Board has an internal RS 232 to USB serial port adaptor This allows the unit to be directly connected to a PC s USB port from which it will receive power and to which it will send serial output sentences with no external RS 232 to USB adaptor is required The term RS 232 and USB serial port are used interchangeably as the RS 232 port is implemented and connected via the USB serial connection Windows and Linux have built in support for this optional serial port functionality 2 1 4 Major connections The LTE Lite Evaluation Board has a number of connectors switches jumpers headers and LEDs to select and display status These are driven by signals from the LTE Lite GPSDO SMT module The major connections and features of the LTE Lite Evaluation Board are shown in Figure 2 3 O 2014 Jackson Labs Technologies Inc 5 LTE Lite User Manual Jackson Figure 2 3 Major connections of the LTE Lite Evaluation Board 2 DEBUG CONNECTOR 5 333 s E J 2 o y wm 20MHz OUT ra Te START AUTO SURVEY L TERNATE POWER EXT TCXO e Inc O 5V Alternate Power Input us Optional Mobile or Stationary Jumper 2 1 5 Typical Phase Noise and ADEV Plots The following plot shows a typical ADEV plot for the LTE Lite Evaluation Board The unit had been operating for 5 days has not been moved or vibrated in any way and was completel
32. r lock status output and the GPS receiver serial output transmit pin 13 for normal operation as the ISP mode is only supported at the JLT factory The GPS receiver can generate NMEA sentences in either 1Hz or 5Hz update rate depending on the rate selection pin 11 default is internally pulled up for 1Hz update rate 2 3 11 Module IO Pinout 20 The LTE Lite SMT Module has 32 SMT pads arranged in a standard IC pinout pattern The following drawing shows the pinout of the module Figure 2 13 Pinout of the LTE Lite SMT Module Top View x 1 EFC GND5 32 NC ALARM x 37 INIT SURV LOCK OK x x H 1PPS OUT SURVEY ACTIVE 2 x lt GND1 WARMUP TRAINING 25 x 10MHz IO FREQ SEL2 40 x x 1 PHASE_LOCK FREQ SEL1 L X DISABLE TCXO FREQ SELO 22 lt 2 GND2 CLOCKOUT ISP 24 x 19 3 0 OUT RESET K T NMEA 1Hz 5Hz 3 3VB LE x 12 RXD_CPU 3 3VA 21 15 TXD GPS VANT EHE 17 TXD CPU GND4 19 lt PPS GPS RAW RF IN 18 x x 16 MOBILE GND3 1 LTE Lite Top View 2014 Jackson Labs Technologies Inc Jackson 7 Table 2 3 shows the LTE Lite SMT Module pin description All IO pins are internally pulled up or pulled down so that the user does not have to terminate any unused pins All unused pins can be left floating Table 2 3 LTE Lite SMT Module IO pin description LTE Lite User Manual Pin Name
33. soldering the module to a customers PCB Pre bakeing is not required for manually hand soldering the unit onto a customers PCB using a solder iron not a heat gun 2 3 1 LTE Lite SMT Module Minimum Required Setup The following schematics show the minimum required connections to operate the LTE Lite SMT Module Only a 3 3V power supply is needed an antenna connection to the internal U Fl coax connector and a connection to the TCXO output and 1PPS output are needed to use the module 2014 Jackson Labs Technologies Inc LTE Lite User Manual J a ck S on Labs Figure 2 9 Minimum required setup for the LTE Lite SMT Module o 3 E 28 yx s 2 2 y M n 2 20 19 18 17 VE GN Ka e Hl CO Y e Sek E et ko LS GEES 25 03 03 lt 5 coco 0 10 eo eo So ES CO Cb cen en siltt onl o j Ee Li DI DI a DIES Sauuuvs amp E A Z El Se sS S s 1 z5 9 E duni LLI CD cO e 258584 5 eobL 2 258 2902883 I3 gt 22 32 55 Es itis E ay HH HH 5 ee T ro R o E S Ex c I E E ay gt Pp e Se H 2 El f iu Le 2 3 2 Using the LTE Lite SMT Module with external TCXOs The following schematics shows how to connect an external 3 0V TCXO to the LTE Lite SMT Module using the internal low noise 3 0V regulator output to power the external TCXO The internal TCXO and TCXO buffer are disabled by pulling the DISABLE TCXO pin 8 of the module high 14 2014 Jackso
34. st performance The antenna cable can be extended to 100m or more with high quality antenna cable use quad shielded RG 6 75 Ohms cable or high quality 50 Ohms coax cable without significant loss of signal quality WARNING Make sure to use a proper and certified Antenna Lightning Arrestor when placing the antenna outside as lightning strikes can cause damage injury or death to equipment and personnel Figure 2 1 LTE Lite Evaluation Board with LTE Lite Module 2 1 1 Airflow Warning The LTE Lite SMT module and thus the LTE Lite Evaluation Board are very sensitive to airflow This includes airflow from convection walking past the unit or Air Conditioning systems For optimal performance the user must insure that the unit is shielded from any airflow by placing the unit into an enclosure for example Hammond PN 1455C801BK Please note that the external DIP 14 TCXO and its socket must be removed from the PCB for it to fit into the aforementioned Hammond enclosure For optimal stability performance of the TCXO the unit should be sealed into an airtight enclosure 4 O 2014 Jackson Labs Technologies Inc Ja ck S on LTE Lite User Manual Labs 2 1 2 Supplied Accessories The LTE Lite Evaluation Kit includes the LTE Lite Evaluation Board and is supplied with a GPS antenna with 5m cable a USB cable a USB wall wart power supply and two MMCX to BNC adaptor cables and is ready to go out of the box Figure 2 2 LTE Lite Evaluation Kit exam
35. the LTE Lite SMT Module Please note that IC U4 is the actual LTE Lite SMT module O 2014 Jackson Labs Technologies Inc 9 Jackson LTE Lite User Manual Figure 2 8 Schematics of LTE Lite Evaluation Board TIFONOW TONO vacatosn KE e Ke Nonoy 0 spou zen age UT 2009 TTT 2009 Ro ABATHG O50 pur zantedez gd9 Teuzesut opos BIOH OR ol emm Aq USATZP ST 04 YN TTEUTON e090 ve E ve SIOR NERINN LA MF A Nad 02 230d erzes 6S0 51280002 mn ws os Leu ws os Leu ws os Lou ws 035 Lsu s SROTTE 2Tnegep 2008 YSETT pue assez uodn pou 4 10032012 CNY I TM ONO aSI oaur 2055282014 SUMI NId 3S0 TENC 1008 II i CEDE i 037 naawa i an nazvo i 10042015 T idm sa zo sa sa u WON HSV13 THEN ONriSLz 09E Il R i i I0JeTN Y AC CL Go EG WOOT SNIV TIENNE n E 4 P E oM M men Prom KT eg ET A NI LNW LISE KN ASE t E EA m AL Us 1ewog ejeuieqtw Aas P et Sir A A bid p Se e E 00 2 NOLINEHENS ME ES ieee 72 E ASE ang ES Ven E 303001 D DE Tid auov a eng NOILdO OXOL TUNYILX3 x OOOO starao eegene mn mm Da wan HOLOSNNOO 9083 wz Ir mdrowav oa LOTTAS SALWLS TINN LT Mou 103 Rte sn aueTa ON n 5 2014 Jackson Labs Technologies Inc 10 LTE Lite User Manual ksony Jac son 3 2 2 Connector Buttons and Switches on the Evaluation Board Table 2 1 shows the LTE Lite Evaluation Board connectors buttons switches and LEDs Table 2
36. the module to allow for external antenna connections Either the internal coax connector or the external antenna feed from the users PCB can be used but not both simultaneously The antenna input pin carries DC power that can be supplied from pin 20 of the module is internally RF blocked and bypassed to the antenna power pin 20 can support up to 100mA current and antenna voltage ranges of 3 0V to 5V The unit supports external passive antennae 0dB gain or active antennae with up to 30dB antenna amplification at GPS L1 frequencies 2 3 7 1PPS Module outputs The LTE Lite SMT Module provides a GPS raw 1PPS CMOS pulse on pin 15 with sawtooth present and a clean TCXO generated sawtooth removed UTC GPS phase locked 1PPS output on pin 4 Both outputs have 3 32 V CMOS level and are rising edge aligned to UTC GPS The loop software on the module will steer discipline the TCXO to become phase locked to the raw GPS 1PPS output signal and thus the two 1PPS signals slowly converge upon each other The process of slowly phase locking the clean 1PPS output to the raw GPS receiver 1PPS output can take several hours to settle due to the long time constants used in the phase locked loop and may be disturbed by thermal changes airflow tilt acceleration or vibration affecting the TCXO crystal frequency 2 3 8 Synthesized RF Output Frequency The LTE Lite SMT Module contains an n m RF synthesizer that uses the TCXO as a reference clock Thus frequen
37. to 100 estimated O 2014 Jackson Labs Technologies Inc 25 LTE Lite User Manual J a ck S on Labs frequency accuracy similar to 100s ADEV seconds in holdover number of Sats tracked lt 12 health status NMEA compatible checksum N B Please note that from time to time this serial port will have short binary messages on it which are routed to the internal GPS receiver It is thus recommended that any parser using the output from this serial port only parses sentences beginning with a valid character and that a parser also checks the NMEA checksum at the end of the sentence and discards any messages or data that does not have valid NMEA format without any adverse effects to the parser itself in case binary messages essentially random noise are present on this serial port 2 5 2 1 Lock Status Definition Lock Status definitions Value State 0 TCXO warmup 1 Holdover 2 Locking TCXO training 4 Value not defined 5 Holdover but still phase locked stays in this state for about 100s after GPS lock is lost 6 Locked no pending events and GPS is active The third binary bit in the status parameter is encoded in the same status as the LOCK OK LED 2 5 2 2 Health Status Definition The proprietary JLT NMEA like status sentence contains a hexadecimal status word that shows system health and oscillator status Encoding is done by each bit indicating a specific parameter and
38. y shielded from airflow by placing the unit into an airtight enclosure Figure 2 4 Typical ADEV plot of 20MHz LTE Lite Evaluation Board Allan Deviation 1E 9 Tau Sigma Tau 1s 5 36E 11 2s 6 08E 11 4s 7 15E 11 8s 8 89E 11 10s 9 64E 11 1E 10 20s 1 30E 10 40s 1 68E 10 80s 1 31E 10 100s 1 04E 10 200s 6 19E 11 400s 3 77E 11 1 94E 11 1000s 1 56E 11 1E 11 7 62E 12 4000s 3 92E 12 2 12E 12 10000s 1 75E 12 20000s 9 43E 13 1E 12 1E 13 Dis 100s 1000s 10000s 100000s Trace Notes InputFreq Sample Interval ADEV at 50s Unsaved 10 000 MHz 0 100s Pasion Aemet pts Unsaved 20 000 MHz 0 100 s 1 68E 10 2d 0h Om Os 1728000 pts 2014 Jackson Labs Technologies Inc J a ck S O n abs LTE Lite User Manual The following plot shows a typical Phase Noise plot of the TCXO buffered RF output for the LTE Lite Evaluation Board The unit had been operating for 1 day and was completely shielded from airflow by placing the unit into an airtight enclosure Figure 2 5 Typical Phase Noise plot of 19 2MHz LTE Lite Evaluation Board Phase Noise L f in dBc Hz 50 0 PM Spur Offset Hz dBc 60 0 70 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 1 Hz 10 Hz 100 Hz 1 kHz 10 kHz 100 kHz Q_Aee _ dBc Hz at 90 kHz 4 10 000 MHz 6 h 74750 pts TimePod 5330A 19 200 MHz 6
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