FMC-Pico-1M4
Contents
1. Power Supply Interface VADJ G39 H40 VADJ C2M 3P3V C39 D36 D38 D40 3P3V C2M 12P0V 2 3 Signal Descriptions e CNV Convert Input A rising edge on this input initiates a new conversion SCK Serial Data Clock Input The conversion result or daisy chain data from another ADC is shifted out on the rising edges of this clock MSB first 14 FMC Pico 1M4 User s Manual Installation and Operation SCK Serial Data Clock Return The return clock signal which is used for ADC data synchronization on the FMC carrier board SDO1 4 Serial Data Output The conversion result or daisy chain data is output on this pin on each rising edge of SCK MSB first The output data is in 2 s complement format SDI1 4 internal signal In chain mode the pin is treated as a serial data input pin where data from previous ADC in the daisy chain is input BUSY_CMN Common BUSY Indicator Goes high at the start of a new conversion and returns low when all the conversions have finished BUSY signals from all four ADCs are OR ed to make one common BUSY CMN signal R1 R4 Range selection signal when high RNGO is selected on the current channel otherwise RNGI is active LEDI LED2 User LEDs control signal when high the LED is lit SCL SDA GAO and GA1 signals are connected to the on board EEPROM chip 24AA64 The user is encouraged to consult the original manufacturer s datasheet for detailed signal description Controlling t2. 4 channel 20 bit 1 MSPS FMC Floating Ammeter 3NINN ZZ3VN Vd DWI All Rights Reserved CAEN ELS d o o Rev 1 1 January 2015 FMC Pico 1M4 User s Manual CAEN ELS Kra ka ulica 2 6210 Se ana Slovenija Mail info caenels com Web www caenels com FMC Pico 1M4 User s Manual Table Of Contents 1 2 3 INTRODUCTION 11 FMC Pico IM4 OVERVIE 1 2 DEVICE DESCRIPTION INSTALLATION AND OPERATION 2 1 GROUND CONNECTIONS 2 2 SIGNALS DEFINITIONS AND 2 3 SIGNAL DESCRIPTIONS FMC Pico 1M4 User s Manual Document Revisions Document Revision Date Comment 10 November 20 2014 First Release LI January 20 2015 Ordering options updated FMC Pico 1M4 User s Manual Safety information Warnings CAEN ELS will repair or replace any product within the guarantee period if the Guarantor declares that the product is defective due to workmanship or materials and has not been caused by mishandling negligence on behalf of the User accident or any abnormal conditions or operations Please read carefully the manual before operating any part of the instrument ZNWARNING ZN Do NOT open the boxes CAEN ELS d o o declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User It is strongly recommended to read thoroughly this User s Manua
3. The user can freely use two additional yellow LEDs upon its discretion board status signalling range selection etc FMC Pico 1M4 User s Manual Installation and Operation 2 Installation and Operation The FMC Pico 1M4 board must be installed on the air cooled FMC carrier board which is compliant to the FMC standard The FMC carrier must support at least the low pin count connector LPC 160 pins but the FMC Pico 1M4 can be also mounted on the high pin count HPC 400 pins connector Only the LPC pins are connected on the mezzanine module The FMC carrier must support voltage range between 1 2 V and 3 3V During the installation and handling the ESD precautions must be respected to prevent electrostatic discharges 2 1 Ground Connections For safety and performance reasons the triaxial connectors are used for the measurement current inlet The measured current path is through the center wire and the inner shield of the triaxial cable see Figure 6 By convention the current that flows from the source into the FMC board through the center wire is measured as positive on the contrary the current that is sinked by the current source and flows from the FMC board through the center wire is measured as negative The return current path is always established through the inner cable shield hO Figure 6 Measured current path There can be large potential difference between the inner and the outer triaxial cable shield b
4. 57 1 EMC Te CPCP complan s Number of Channels On Boar 7 General information for the FMC Pico Current Polarity Maximum Sampling Rate Equivalent Sigi Resolution 20 bit Conversion Time Tcosv Bandwidth 3dB gt 10 kHz Temperature Coefficient TC 10 ppm C Unbalance of Input Channels lt 0 05 without calibration Differential TC lt 25 Front End Isolation Voltage 300 V Table 8 Electrical specifications for FMC Pico 1M4 FMC Pico 1M4 User s Manual Technical Specifications 5 2 Equivalent Input Noise Different equivalent input noise typical values for the two different measuring ranges and for different sampling rates are hereafter presented Noise tests are performed by shorting the signal ground on the chassis ground and by shielding the inputs Equivalent Input Noise RNGO 1 mA RNGI 41 pA Fs 20 ksps nope TENES Fs 200 ksps d m pus Fs 1 vd gnus Table 9 Equivalent Input noise for different sampling rates The basic sampling rate is 1 Msamples s and the computation is made by averaging the number of samples in order to reach the other listed values e g averaging of 5 samples to obtain Fs 200 ksps equivalent input noise value 5 3 Digital Interface and Power Supply Requirements The FMC Pico 1M4 is designed to operate in the LVCMOS mode from 1 2 V to 3 3 V depending on the voltage supply level provided by the carrier boar
5. front end is designed in order to achieve low noise low temperature dependence and very small unbalance between channels The analog characteristi n be further improved by requesting a factory calibration of the channels Calibration data are stored in the on board EEPROM memory that can be read via an I2C bus on the FMC connector A metallic shield has a dual function of shielding the analog front end from external noise sources and also galvanically isolates the internal electronics that could be floating up to 300 V A trigger signal can be fed to the FMC connector in order to start the conversion of data samples this feature allows synchronizing the board acquisition to an external event e g machining revolution frequency in storage rings Data readout can be performed via separate SPI links i e one for each channel sharing the same clock signal or can be daisy chained thus requiring less signals to be handled 7 FMC Pico 1M4 User s Manual Introduction 1 2 Device Description Both sides and the front view of the FMC Pico 1M4 can be seen on the following Figure 1 Figure 2 and Figure 3 Figure 3 FMC Pico IM4 front view p t The FMC Pico 1M4 device is composed of several building blocks the analog front end the ADC and isolation section the range selection block the power supply part The block diagram of the whole device can be seen on the Figure 4 9 Introduction FM
6. C Pico 1M4 User s Manual lin lina Figure4 FMC Pico 1M4 block diagram The analog front end is built from several functional blocks Figure 5 The current signal is fed to the device through the LEMO triaxial connector The next stage is current to voltage conversion where the current signal is transformed to a voltage one filtering and translation from sigle ended to differential signalling is also performed The analog to digital conversion of the signal is obtained from this last stage Before the digital data stream reaches the FMC connector it is galvanically isolated from the analog front end The digital voltage levels are also adapted to the FMC carrier ones Each analog front end has two measurement ranges which can be independently selected from channel to channel In gt smi se GND iso cun aso Figure 5 detailed block diagram of a single channel The power supply part is responsible for the generation of the appropriate isolated power supply rails 5 V 5 V and 2 5 V which are required for the high quality analog to digital signal conversion There are several light emitting diodes LEDs on the FMC Pico 1M4 board The four green ones are signaling the precence of the power supply voltages that are supplied from the carrier board 12POV 3P3V 3P3VAUX and VADJ The group of three red LEDs shows the status of power supply voltages that are generated on board by the power supply module
7. Y 5 Table 6 Timi characteristics Controlling the FMC Pico 1M4 User s Manual 3 5 Integration on DAMC FMC25 The FMC Pico M4 can be installed on the DAMC FMC25 MTCA 4 carrier board produced by CAEN ELS see Figure 17 Up to two FMC cards can be installed on a single carrier allowing to configure an 8 channel current measuring board Please note that the input channels of one FMC board can be at a different potential respect to the input channels of the other FMC board installed Since the input channels of one FMC board can float up to 300 V respect to ground the maximum potential difference between the input channels of one FMC board and the other can be of 600 V Figure 17 two FMC Pico 1M4 installed on a DAMC FMC25 FMC Pico 1M4 User s Manual Ordering Options 4 Ordering Options The ordering code of the FMC Pico 1M4 is the following NOTE fields characters shaded in grey color are fixed 4 1 Optional Codes Input mating connectors can be purchased separately by the ordering code it includes 4 mating connectors as a kit Customization and calibration of the input ranges of the FMC Pico 1M4 can be performed as a service by indicating the values of the full scale input ranges Technical Specifications FMC Pico 1M4 User s Manual 5 Technical Specifications Technical Specifications for the FMC Pico 1M4 mezzanine cards are hereafter presented Board Type FPGA Mezzanine Card FMC VITA
8. d on the VADJ pins VREF M2C pin is unconnected on the mezzanine module The current consumption for all four power supply voltages is indicated in the table 3 To prevent overheating of the FMC board the user must ensure appropriate airflow Power Supply Allowed Voltage Number of Current Voltage Range V Pins Consumption Tolerance VADJ 12933 2 10mA 25V 35 3P3VAUX 33 1 5mA 5 3P3V 33 4 25 mA 5 Jo 12P0V 12 2 150 mA 5 Table 10 Current consumption for all power supply voltages Oe Technical Specifications FMC Pico 1M4 User s Manual The FMC Pico 1M4 also carries a small serial EEPROM chip 24AA64 which is accessible from the carrier board through the I2C bus The EEPROM is powered by the 3P3VAUX power supply The EEPROM is not write protected so the user should take care not to overwrite the factory programmed data FMC Pico 1M4 User s Manual Mechanical Dimensions 6 Mechanical Dimensions The FMC Pico 1M4 board complies with the FMC standard known as ANSI VITA 57 1 The board is a sing air cooled FMC card with front panel T O connectors and used region LA of the FMC Pico 1M4 is 10 mm 0 available on the front trical specifications al dimensions of the FMC board can Table 11 Mechanical dimensions
9. e see Figure 11 enables simultaneous reading of the ADC output data in parallel from all the four ADCs In chain mode see Figure 12 the ADCs are daisy chained so the output from the ADCI is passed to the ADC2 and so on The last ADC the ADC4 outputs concatenated data from all four ADCs through its SDO4 pin In this way it is possible to use just one serial data output SDO4 instead of four r L pm HE NEN 180 ey amp iq Figure 11 Normal mode block diagram FMC Pico 1M4 User s Manual Controlling the Figure 12 Chain mode block diagram 3 2 ADC Mode Selection Default factory mode selection for FMC Pico 1M4 is normal mode If the user wants to control the FMC Pico 1M4 in chain mode he has to change solder jumpers on the PCB see Figure 13 Solder jumpers are 0402 sized SMD chip resistors with resistance value of 0 O and the four N resistors must be mounted if using the normal mode while the four marked witha whenusingthe 3 3 Timing Diagrams In Normal mode the SDO signal is always driven MSB D19 of the new conversion data is available at the falling edge of BUSY This is the simplest way to operate the four ADCs Normal Mode timing diagram is shown on the Figure 14Figure 14 Con ntrolling the FMC Pico 1M4 U
10. ecause of the front end isolation Therefore the outer shield of the triaxial cable must be grounded see Figure 7 The voltage between both shields must be limited as breakdown may occur so the maximum value of the isolation voltage is given in the electrical specifications section V iso non 77 7 EARTH GND ISO Figure 7 Definition of isolation voltage Installation and Operation FMC Pico 1M4 User s Manual Grounding can be done in two different ways The first option is to make the ground connection at the current source side see Figure 8 but we can also make the ground connection on the FMC board side through the FMC bezel which is connected to the grounded chassis see Figure 9 In the latter case we must make an electrical connection on the FMC Pico 1M4 board because the outer shield of the triaxial connector is not hardwired to the bezel If we want to make this connection we must solder two jumpers on the FMC Pico 1M4 board which are in fact two 0 0 chip resistors of 0805 form factor see Figure 10 The grounding technique depends on the user requirements and it is upon exclusive user discretion GND ISO LEN EARTH Figure 8 Grounding at the current source side L EARTH GNDISO Figure 9 Grounding at the FMC board side Figure 10 Jumpers for connecting the bezel to the input connectors 2 2 Signals Definitions and Pinout Interface signals are grouped into five categories Inter
11. face signals which are interfacing ADCs on the FMC Pico 1M4 board Range Selection signals which are used for the selection of the measurement ranges General Purpose LEDs driving signals for the two general purpose LEDs Onboard EEPROM interface signals for onboard EEPROM memory Power Supply Interface E FMC Pico 1M4 User s Manual Installation and Operation The definition of signal direction is as follows e carrier board sources the signal output mezzanine board is the signal sink input 2 mezzanine board sources the signal output carrier board is the signal sink input The LPC connector assignment of signals its pin name and the direction sorted SCK RTRN G12 LA08 P SD SDO2 H16 P SD gt z SDO4 HI3 LA07 P Table 1 ADC interface signals Signal name RI G10 LA03_N R2 G09 C AGP R3 LA02 R4 H07 LA02 P by category are presented in the following Table 1 Table 2 Table 3 Table 4 Table 5 Direction C2M C2M C2M C2M Table 2 Range selection signals Installation and Operation FMC Pico 1M4 User s Manual General Purpose LEDs Signal name LPC Pin Assignment Pin Name Direction LED1 DII LA05_P C2M LED2 D12 LA05_N C2M Table 3 General purpose LED signals Signal name L Direction System Management serial clock C30 SCL C2M 12 channel select C34 C2M
12. he FMC Pico 1M4 User s Manual 3 Controlling the FMC 3 1 Digital Interface The ADC conversion is controlled by signal A rising edge on CNV will start a conversion Once a conversion has been initiated it cannot be restarted until the conversion is complete For optimum performance CNV should be driven by a clean low jitter signal Converter status is indicated by the BUSY output which remains high while the conversion is in progress To ensure that no errors occur in the digitized results any additional transitions on CNV should occur within 40 ns from the start of the conversion or after the conversion has been completed Once conversion has completed the ADC begins acquiring the input signal The ADC has an internal clock that is trimmed to achieve a maximum conversion time of 675 ns With a minimum acquisition time of 312 ns throughput performance of 1Msps is guaranteed The ADC has a serial digital interface The serial output data is clocked out on the SDO pin when an external clock is applied to the SCK pin Clocking out the data after the conversion will yield the best performance With a shift clock frequency of at least 64MHz a IMSps throughput is still achieved The serial output data changes state on the rising edge of SCK and can be captured on the falling edge or next rising edge of SCK D19 remains valid until the first rising edge of SCK On board ADCs be controlled in two modes Normal mod
13. l before any kind of operation CAEN ELS d o o reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice Disposal of the Product The product must never be dumped in the Municipal Waste Please check your local regulations for disposal of electronics products FMC Pico 1M4 User s Manual Read over the instruction manual carefully before using the instrument The following precautions should be strictly observed before using the device CAUTION Do not use this product in any manner not specified by the manufacturer The protective features of this product may be impaired if it is used in a manner not specified in this manual Do notusethe device if it is damaged Before you us the device inspect the instrument for possible cracks or breaks before each use Do not operate the device around explosives gas vapor or dust Always use the device with the cables provided Turn off the device before establishing any connection Do not operate the device with the cover removed or loosened Do not install substitute parts or perform any unauthorized modification to the product Return the product to the manufacturer for service and repair to ensure that safety features are maintained This instrument is designed for indoor use and in area with low condensation FMC Pico 1M4 User s Manual The following table shows the gene
14. ral environmental requirements for a correct operation of the instrument Environmental Conditions Requirements Operating Temperature 0 C to 50 Operating Humidity 30 to 8596 RH non condensing Storage Temperature 10 C to 60 C Storage Humidity 596 to 90 RH non condensing Introduction FMC Pico 1M4 User s Manual 1 Introduction This chapter describes the general characteristics and main features of FMC Pico 1M4 mezzanine cards 11 FMC Pico 1M4 Overview The CAEN ELS FMC Pico 1M4 is a standard FPGA Mezzanine Card FMC Low Pin Count LPC daughter board that allows high resolution monitoring of bipolar currents up to 1 mA with maximum sampling rate of 1 MHz It is mechanically and electrically compliant to the FMC standard ANSI VITA 57 1 The front end is composed of a specially designed transimpedance input stage for current sensing combined with analog signal conditioning and filtering stages making use of state of the art electronics The 20 bit resolution is obtained from independent simultaneous sampling and low delay SAR Successive Approximation Register Analog to Digital Converters ADCs Each channel has two full scale measuring ranges up to amp mA and 1 pA respectively and the current source can be floating up to 300 V respect to the FMC ground The floating capability of the inputs is perfectly suitable for applications where the detector or current source needs to be biased The analog
15. ser s Manual CONVERT POWER DOWN AND ACQUIRE E E E Figure 14 Normal mode timing diagram deo 500 In chain mode SDO is always enabled and SDI serves as the serial data input pin SDI where daisy chain data output from another ADC can be input This is useful for applications where hardware constraints may limit the number of lines needed to interface to a large number of converters The MSB of converter n will appear at SDO of converter n 1 after 20 SCK cycles The MSB of converter n is clocked in at the SDI pin of converter n 1 on the rising edge of the first SCK Chain mode timing diagram can be seen on the Figure 15 coment PONER DON AND ACQUE 00 50 1 J or or 25 EE la ai CA Figure 15 Chain mode timing diagram SCK FMC LPC Isolation EH SCK RTRN Figure 16 Clock loopback block diagram FMC Pico 1M4 User s Manual Controlling the FMC 3 4 Timing Characteristics Symbol Parameter Min Max fSMPL Maximum Sampling Frequency 1 tconv Conversion Time 615 675 taco Acquisition Time 312 Time Between 1 tenva CNV High Time Minimum Low Time for CNV ime from CNV m SCK Period 10 PY SCK Low Time 4 tHusDISCK SDI Hold Time From SCKT 1 EE nc S tospo SDO Data Valid Delay from SCK1 8 tpsponusyL SDO Data Valid Delay from BUS
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