Texas Instruments DAC7716EVM User's Manual
Contents
1. 1 2 3 4 5 6 REVISION HISTORY REV ENGINEERING CHANGE NUMBER APPROVED IOVDD VA VA 5VD LDAC I T SDO DE aL 10hF 10uF GS A 10uF gt gt SCLK D b a GPIO 0 e3 1e 5 6 vg als als z 3 amp Uni Bip A e7 36 R6 R7 SRS e9 100 ms 10k 10k 10k r 11 12 4I 3 3 3 Q ao m Al q eis ue S 22 228 6 8 15 16 4 e 6 e1 15e 4 e19 20 m Serial Header Top SIE R cs Ymon DA R SEEK 15 HES 2 SDO RFB1 0 LDAC NAP DAC RFB2 0 I H a SGND 0 5 34 8 Vout 1 6 Uni Bip A Uni Bip A w RFB1 1 5 Uni BiPB DAC7716 od 17 9 7 36 19 NC e2 GPIO 0 sr c ouk 1 T NC ep DAUGHTER ANALOG Enc GPIO 0 A GPIO 1 Ab en NG RS L Analog to only be p ptlafedlat op of board e3 1e SNC SGND 2 e os BI 12 NG Vout 3 JE ob H IDIPSWITCH 4 42 Nc Bene eu 120 7 RFBA S HH e913 14 RST SGND 3 e15 16e E 17 18 TIS DA Le19 20e4 E 9 g 33 a 6 Serial Header Bottom x o o aa i D DB a lt o0 v TP3 SDI DAUGHTER ANALOG BOTTOM CS S2. Products Applications Amplifiers amplifier ti com Audio www ti com audio Data Converters dataconverter ti com Automotive www ti com automotive DLP Products www dlp com Broadband www ti com broadband DSP dsp ti com Digital Control www ti com digitalcontrol Clocks and Timers www ti com clocks Medical www ti com medical Interface interface ti com Military www ti com military Logic logic ti com Optical Networking www ti com opticalnetwork Power Mgmt power ti com Security www ti com security Microcontrollers microcontroller ti com Telephony www ti com telephony RFID www ti rfid com Video amp Imaging www ti com video RF IF and ZigBee Solutions www ti com lprf Wireless www ti com wireless Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright 2009 Texas Instruments Incorporated
3. modifications enhancements improvements and other changes to its products and services at any time and to discontinue any product or service without notice Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete All products are sold subject to Tl s terms and conditions of sale supplied at the time of order acknowledgment TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with Tl s standard warranty Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty Except where mandated by government requirements testing of all parameters of each product is not necessarily performed TI assumes no liability for applications assistance or customer product design Customers are responsible for their products and applications using Tl components To minimize the risks associated with customer products and applications customers should provide adequate design and operating safeguards TI does not warrant or represent that any license either express or implied is granted under any TI patent right copyright mask work right or other TI intellectual property right relating to any combination machine or process in which TI products or services are used Information published by TI regarding third party products or services does not constitute a license f
4. serde naea EE iA e UT esa DAD E SANI A CERE nase LA UN LE D DUI AN 2 2 Analog Interface eem 3 3 Digital Interface 25 5 ue ese ena ra tian aeta Ee va nini sina nion Pav aga tuauicua Cort a E E TUAE PeVa Ns a UpUTE AE CAR VR MR ERA 3 4 POWCrSUPDIES e D m 5 5 Reference Voltage iwisssdnsiaicaiiaiaircatenisanraica weiaiine an satewatireiieiprelnaibie EEEE E EEEE E 5 6 Rerum 6 7 SCHEMaticsANd Layout e 8 List of Figures 1 Reference Test Polntsi u use cose a erano Ee nano iep a nexa p win rap a RU EDU MN FEN EE DUM w aiuto EVEN alee DUxK E RAN RR MEAE 6 2 DAC7716EVM Default Jumper Locations 0ceccceee seen eee ee eee eee eee enne nnne nmn hn nnne nnne nnn 7 3 Default Settings for Switch S1 LDA Low csessessssesseslneelIe ene e emen emen nennen 8 4 Default Settings for Switch S2 and S3 ccsseesssssesseeeseesesse esee enne emen nennen nenne 8 List of Tables 1 J1 Analog Interface PINOUt ccc cceeeeee eee e cece nee eeee nnne nnm nnne ne nnne enne nnne nennen nnn 3 2 J2 Serial Interface PITIS aesan E E EE uis sex eot Pru S E Red Ec REM N 4 3 J3 Configuration Power Supply INDUt 0c eeee cece eee eee eee eee eee een eee e enn enne emn hene e nnne 5 4 DAG7716EVM Bill of Materials iersinii eden te a erem nau E ne eae sieur aD quedam RED E 9 1 EVM Overview 1 1 Features DAC7716EVM Contains all support circuitry needed for the DAC7716 Voltage reference options Either
5. 5V or 2 5V onboard or external Jumpers on output pins for gain adjustment Compatible with the TI Modular EVM System This manual covers the operation of the DAC7716EVM Throughout this document the abbreviation EVM and the term evaluation module are synonymous with the DAC7716EVM 1 2 Introduction The DAC7716 uses a high speed SPI interface up to 50MHz to communicate with a DSP or a microprocessor using a compatible serial interface The DAC features four individual outputs whose gain is controlled by the addition of a feedback resistor An additional Vyoy pin can relay any of the four output channels from the DAC or the signal from the A pin The DAC7716EVM is designed to run in either bipolar default mode or unipolar modes of operation This flexible design allows for a wide range of supply voltages The operating mode can be controlled using an onboard switch or digitally through the digital header The DAC7716EVM is an evaluation module built to the TI Modular EVM System specification It can be connected to any modular EVM system interface card The EVM ships in the TQFP 48 pin package option Note that the DAC7716EVM has no microprocessor and cannot run software To connect it to a computer some type of interface is required The device shown in the front page figure is the DAC8734 the 16 bit version of the DAC7716 The DAC77106 is installed in place of the DAC8734 on the DAC7716 evaluation module 2 DAC7716EVM SBAU159
6. position on RoHS compliance see the TI web site 8 DAC7716EVM SBAU159 October 2009 Submit Documentation Feedback Copyright 2009 Texas Instruments Incorporated I TEXAS INSTRUMENTS www ti com Schematics and Layout Table 4 DAC7716EVM Bill of Materials Item No Qty Ref Des Description Manufacturer Mfr Part Number 1 1 N A Printed wiring board Texas Instruments 6508538 2 6 C1 C6 C10 Capacitor ceramic 1 0uF 16V X5R TDK C1608X5R1C105K C11 C14 C15 1096 0603 3 7 C2 C3 C4 Capacitor ceramic 10uF 25V X5R MuRata GRM31CR61E106KA12L C5 C7 C8 1206 1096 C9 4 4 C12 C13 Capacitor ceramic 10uF 10V 0603 Panasonic ECJ 1VB1A106M C16 C 17 X5R 20 D1 Not installed N A N A JP1 JP6 JP7 Header strip 3 pin 1x3 Samtec TSW 103 07 L S JP2 JP3 JP4 Header strip 2 pin 1x2 Samtec TSW 102 07 L S JP5 JP9 1 JP8 Header strip 6 pin 2x3 Samtec TSW 103 07 L D 2 J1A J2A 10 Pin Dual Row SM Header 20 Samtec TSM 110 01 T DV P Top Side Pos 10 0 J1B Not installed N A N A Bottom Side 11 1 J2B 10 Pin Dual Row SM Header 20 Samtec SSW 110 22 F D VS K Bottom Side Pos 12 1 J3A 5 Pin Dual Row SM Header 10 Pos Samtec TSM 105 01 T DV P Top Side 13 1 J3B 5 Pin Dual Row SM Header 10 Pos Samtec SSW 105 22 F D VS K Bottom Side 14 0 J4 Not installed N A N A 15 5 R1 R2 R3 Resistor 33 Q 1 10W 5 0603 SMD Panasonic ERJ 3GEYJ330V
7. 13 TEXAS INSTRUMENTS DAC8734EVM JP2 Rev 2 JP3 I Nur ur J16 4 C T ic 2009 ae 1 Ref A GND d ce EC hs UM ti E TP2 Na HEE e piya E DiR2 12 RIG Bl s i DN RI Mi Ex Dir SITIY Ext Ref i 22 6 Ljpg DAC7716EVM User s Guide SBAU159 October 2009 DAC7716EVM wu Nur oe d This user s guide describes the characteristics operation and use of the DAC7716EVM The evaluation module EVM is an evaluation board that allows for quick and easy evaluation of the DAC7716 The DAC7716 is a quad high accuracy 12 bit R 2 R digital to analog converter DAC The device features low power operation good linearity and the ability to use different reference voltages for the output channels This EVM allows evaluation of all aspects of the DAC7716 Complete circuit descriptions schematic diagrams and bill of material are included in this document The following related documents are available through the Texas http www ti com EVM Compatible Device Data Sheets Literature Number DAC7716 SBAS463 REF5025 SBOS410 REF5050 SBOS410 OPA211 SBOS377 TL750L08 SLVS017 All trademarks are the property of their respective owners SBAU159 October 2009 Submit Documentation Feedback Copyright 2009 Texas Instruments Incorporated Instruments web site at DAC7716EVM 1 I TEXAS INSTRUMENTS EVM Overview www ti com Contents 1 EVM OVERVIEW
8. 7716EVM is a serial input data converter The evaluation module is designed for interfacing to multiple control platforms SBAU159 October 2009 DAC7716EVM 3 Submit Documentation Feedback Copyright 2009 Texas Instruments Incorporated Digital Interface 3 1 Serial Data Interface I TEXAS INSTRUMENTS www ti com Samtec part numbers SSW 110 22 F D VS K and TSM 110 01 T DV P provide a 10 pin dual row header socket combination at J2 This header socket provides access to the digital control and serial data pins from both J2A top side and J2B bottom side of the connector Consult Samtec at http www samtec com or call 1 800 SAMTEC 9 for a variety of mating connector options Table 2 describes the serial interface pins Table 2 J2 Serial Interface Pins Pin No Signal Name I O Type Pullup Function J2 1 Unused J2 2 GPIO 0 In Out High GPIO 0 J2 3 J2 5 SCLK In None DAC7716 SPI clock pins are shorted together J2 4 DGND In Out None Digital ground J2 6 GPIO 1 In Out High GPIO 1 J2 7 J2 9 cs In None SPI bus chip select pins are shorted together J2 8 Uni Bip A In High Output mode select of Group A J2 10 DGND In Out None Digital ground J2 11 SDO SDI In Out None DAC7716 SPI data in out J2 12 Uni Bip B In High Output mode select of Group B J2 13 Unused J2 14 RST In High Input register reset J2 15 LDAC In High GPIO signal to control LDAC for DAC output l
9. C to be connected to ground Switches S1 2 and 81 4 are open to short circuit Uni Bip A and Uni Bip B to ground This configuration sets the DAC7716 to bipolar mode default Figure 3 shows the default settings for switch S1 Figure 3 Default Settings for Switch S1 LDAC Low Switch S2 controls the reference voltage selection for Ref B When the switch is furthest left position 1 the onboard 5V reference is used from the REF5050 When the switch is in the middle position position 2 the onboard 2 5V reference is used from the REF5025 If the switch is moved to the right position 3 Ref B is set up to use an external reference Pins J1 18 Ref and J1 20 Ref are used to apply an external reference voltage Switch S3 controls the reference voltage selection for Ref A The switch has the same functionality as switch S2 By default switch S2 and switch S3 are set to use the 5V onboard reference as Figure 4 shows Ref A j Ref B r J 5U 2 5U Ext Ref Figure 4 Default Settings for Switch S2 and S3 7 Schematics and Layout Schematics for the DAC7716EVM are appended to this user s guide The bill of materials is provided in Table 4 7 1 Bill of Materials NOTE All components should be compliant with the European Union Restriction on Use of Hazardous Substances RoHS Directive Some part numbers may be either leaded or RoHS Verify that purchased components are RoHS compliant For more information about TI s
10. CLK JP7 JP6 and JP7 control the RefGND D 3POS JUMPER VA 600 B u 4 Sce ici TL750L08 NKK_SS14MDP2 TS o e D 5 Output al TP4 TPS input 2 2 ico Com VN vout 10uF NC 3 cio TEMP L L Com 24 Fig GND TRIM NC EG 6 REFS050 a Som T ExtREF 3 3VD 1 8VD 5VA VA VA 5VA 5VD VA VA 5 5VA 5VA 4 VIN VOUT DGND AGND ci TEMP 1 8VD VD me GND TRIM TP2 3 3VD 5VD L o R13 9 3 J NAA 4 I EXAS m I a NSTRUMENTS A NKK SS14MDP2 C17 PRECISION ANALOG PRODUCTS 10uF HIGH PERFORMANCE ANALOG DIVISION SEMICONDUCTOR GROUP L 5411 EAST WILLIAMS BOULEVARD TUCSON AZ 85711 USA TITLE PR 2X3 ENGINEERT Calabria D AC8734EVM DRAWN BYT Calabria DOCUMENT CONTROL NO6508538 SIZE B DATE REV A SHEET OF FILE 1 2 3 4 5 6 Evaluation Board Kit Important Notice Texas Instruments TI provides the enclosed product s under the following conditions This evaluation board kit is intended for use for ENGINEERING DEVELOPMENT DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer use Persons handling the product s must have electronics training and observe good engineering practice standards As such the goods being provided are not intended to be complete in terms of required design marketing and or manufacturing related protective considerations including product safety and environmental measures typica
11. Note that if an external reference voltage is input to J1 20 it will be filtered through a first order low pass RC filter To input your own reference signal without this filter connect the reference signal directly to TP1 or TP2 Figure 1 shows the reference test points on the EVM Figure 1 Reference Test Points 6 EVM Operation This section provides information on the analog input digital control and general operating conditions of the DAC7716EVM 6 1 Analog Output The DAC7716 has four analog outputs that are available through the J1 header or the J4 header The J4 header is designed to use 90 degree Samtec pins not installed when multiple EVMs are stacked to be used in daisy chain mode Jumpers J5 J8 control the gain of the individual output channels by connecting additional feedback resistors to the internal op amp buffer See the DAC7716 data sheet for more information on setting the gain Each analog output is able to swing 16V in bipolar mode and 0 to 20V in unipolar mode The signal ground SGND N for the output signals are connected to header J1 and are short circuited to the board ground All of the output signals are referenced to the ground of the board Von is the channel monitor output It can relay any of the four analog output signals or the A signal The Von Signal is buffered and current limited through the OPA227 U2 By default the Vio pin is in 3 state mode causing the op amp to saturate In order to av
12. October 2009 Submit Documentation Feedback Copyright 2009 Texas Instruments Incorporated I TEXAS INSTRUMENTS www ti com Analog Interface 2 Analog Interface For maximum flexibility the DAC7716EVM can interface to multiple analog sources Samtec part numbers SSW 110 22 F D VS K and TSM 110 01 T DV P provide a 10 pin dual row header at J1 This header provides access to the analog input and output pins of the DAC Consult Samtec at http www samtec com or call 1 800 SAMTEC 9 for a variety of mating connector options Table 1 summarizes the pinouts for analog interface J1 Table 1 J1 Analog Interface Pinout Pin Number Signal Description J1 1 SGND 0 Signal GND DAC output 0 J1 2 Vour 0 Analog output 0 J1 3 SGND 1 Signal GND DAC output 1 J1 4 Vour 1 Analog output 1 J1 5 SGND 2 Signal GND DAC output 2 J1 6 Vour 2 Analog output 2 J1 7 SGND 3 Signal GND DAC output 3 J1 8 Vour 3 Analog output 3 J1 9 13 odd AGND Analog ground connections J1 10 An Auxiliary analog input J1 14 VMon_BUF Monitor output after buffer J1 15 Unused J1 17 19 odd AGND Analog ground connections J1 18 RefGND Reference ground pins on the DAC7716 see below J1 20 EXTREF External reference source input side of reference input J1 12 Unused J1 16 Unused The analog interface is populated on the top of the evaluation model This configuration makes it possible to stack multiple E
13. R4 R5 16 6 R6 R7 R8 Resistor 10 kO 1 10W 5 0603 SMD Yageo RC0603JR 0710KL R9 R10 R11 17 2 R12 R13 Resistor 1 0 kO 1 10W 596 0603 SMD Panasonic ERJ 3GEYJ102V 18 2 R14 R15 Resistor 1 0 O 1 10W 596 0603 Panasonic ERJ 3GEYJ1ROV 19 1 R16 Resistor 200 KQ 1 10W 1 0603 SMD Panasonic ERJ 3EKF2003V 20 1 S1 Switch Dip Tape 4 pos C amp K TDAO4HOSB1R 21 2 S2 S3 SW SLIDE ULTRA MINI SP3T TOP NKK SS14MDP2 ACT 22 3 TP1 TP2 TP3 Test Point Single 025 Pin Red Keystone 5000 23 2 TP4 TP5 Test Point Single 025 Pin Black Keystone 5001 24 1 U1 Quad 12 bit High Accuracy DAC Texas Instruments DAC7716SPFB TQFP Package 25 1 U2 OPA227 Differential Operational Texas Instruments OPA227UA Amplifier 26 1 U3 Single output 8V voltage regulator Texas Instruments TL750L08CD 27 1 U4 Precision Voltage reference 2 5V Texas Instruments REF5025AID 28 1 U5 Precision Voltage reference 5 0V Texas Instruments REF5050AID 29 8 N A 0 100 Shunt Black Samtec SNT 100 BK T Manufacturer and part number for items may be substituted with electrically equivalent items J3B parts are not shown in the schematic diagram J3B is installed on the bottom side of the PWB opposite to J3A SBAU159 October 2009 Submit Documentation Feedback DAC7716EVM 9 Copyright 2009 Texas Instruments Incorporated
14. VMs to run them in daisy chain mode J4 can be installed with a 90 degree connector to allow access to the analog outputs if multiple EVMs are stacked The J1B connector can be installed if the part is used as a standalone board The DAC7716 can be configured with an output gain of 2 or 4 By default the analog outputs of the DAC7716EVM are configured with a gain of 4 If a gain of 2 is desired the proper jumper must be installed JP2 JP5 depending on the output channel and the command register must be set accordingly The SGND pins of the DAC7716 are connected to the ground of the evaluation board The Auxiliary Analog Input pin can be further protected from over voltage and over driving conditions A Schottky diode D1 can be installed to protect the DAC7716 from an input over voltage condition An op amp buffer is placed on the Vyoy output to limit the current that passes through the pin The DAC7716EVM has an external reference voltage option If an external reference voltage is used switches S2 and S3 must be properly configured Use the EXTREF J1 20 to apply an external reference voltage The DAC7716 is designed to have the REFGND A and REFGND B pins within 0 3V of the AGND Therefore we recommend not using the RefGND pin when connecting an external reference Connect the ground source of the reference voltage to the ground of the board J1 19 See the Reference Voltage section for more information 3 Digital Interface The DAC
15. assistance customer product design software performance or infringement of patents or services described herein Please read the User s Guide and specifically the Warnings and Restrictions notice in the User s Guide prior to handling the product This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application engineer or visit www ti com esh No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine process or combination in which such TI products or services might be or are used FCC Warning This evaluation board kit is intended for use for ENGINEERING DEVELOPMENT DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer use It generates uses and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules which are designed to provide reasonable protection against radio frequency interference Operation of this equipment in other environments may cause interference with radio communications in which case the user at his own expense will be required to take whatever measures may be required to correct this interference EVM Warnings and Restrictions It is important to operate this EVM within the inpu
16. atch update J2 16 Unused J2 17 LDAC In High Alternate GPIO signal to control LDAC for DAC output latch update J2 18 DGND In Out None Digital ground J2 19 Unused J2 20 Unused 4 DAC7716EVM Group A contains Vour 0 and Vour 1 Group B contains Voy 2 and Vour 3 The SCLK signal and the CS signal can each be controlled by two different pins on J2 Pins J2 3 and J2 5 have been shorted together as well as pins J2 7 and J2 9 Pins J2 8 J2 12 J2 14 J2 15 and J2 17 have weak pull up pulldown resistors These resistors provide default settings for many of the control pins J2 3 J2 5 J2 7 J2 9 J2 11 correspond directly to DAC7716 pins See the DAC7716 product data sheet for complete details on these pins Control signals to and from the DAC7716 can be accessed through the digital interface or switches and jumpers found directly on the EVM The LDAC Uni Bip A Uni Bip B and RST signals are initially pulled high through 10kQ resistors and can be controlled by switch S1 or through J2 The load DAC LDAC pin is connected via jumper JP1 to either the J2 15 or J2 17 pin Updating the DAC registers can be completed in two different ways LDAC can either be tied to ground in which case the input registers are immediately updated or LDAC can be pulled high Therefore the DAC registers update when LDAC is taken low Switch S1 1 can be closed to hold the LDAC low See the DAC7716 data sheet for more inf
17. et for the restrictions on the power supplies for the two operating modes 5 Reference Voltage The DAC7716EVM has the ability to use two different reference sources simultaneously for different output channels REFA and REFB control the reference voltages for the DAC Output channels Vour 0 and Vour 1 use REFA as a reference REFB is used as a reference for output channels Voy7 2 and Vo 3 The evaluation module has three options for supplying reference voltages to the DAC7716 Switch S3 REFA and S2 REFB can select the reference voltage from the REF5050 U5 REF5025 U4 or use an external reference The REF5050 supplies 5 0V to the reference The REF5025 supplies 2 5V to the reference These reference voltages are additionally filtered through an RC filter before connecting to the DAC7716 The TL751L08 is used to voltage regulate VA to properly power the REF5025 and REF5050 When using an external reference make sure that the ground terminal from the external source is connected to the ground of the EVM board There is a built in diode in the DAC7716 that does not allow the RefGND A RefGND B to have more than a 0 3V difference from the board AGND on the DAC A jumper across pins 2 and 3 on JP6 and JP7 connects the RefGND A and RefGND B to the ground of the board SBAU159 October 2009 DAC7716EVM 5 Submit Documentation Feedback Copyright 2009 Texas Instruments Incorporated I TEXAS INSTRUMENTS EVM Operation www ti com
18. lly found in end products that incorporate such semiconductor components or circuit boards This evaluation board kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility restricted substances RoHS recycling WEEE FCC CE or UL and therefore may not meet the technical requirements of these directives or other related directives Should this evaluation board kit not meet the specifications indicated in the User s Guide the board kit may be returned within 30 days from the date of delivery for a full refund THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED IMPLIED OR STATUTORY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE The user assumes all responsibility and liability for proper and safe handling of the goods Further the user indemnifies TI from all claims arising from the handling or use of the goods Due to the open construction of the product it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES TI currently deals with a variety of customers for products and therefore our arrangement with the user is not exclusive TI assumes no liability for applications
19. nd agree that they are solely responsible for all legal regulatory and safety related requirements concerning their products and any use of TI products in such safety critical applications notwithstanding any applications related information or support that may be provided by TI Further Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety critical applications TI products are neither designed nor intended for use in military aerospace applications or environments unless the TI products are specifically designated by TI as military grade or enhanced plastic Only products designated by TI as military grade meet military specifications Buyers acknowledge and agree that any such use of TI products which TI has not designated as military grade is solely at the Buyer s risk and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are designated by TI as compliant with ISO TS 16949 requirements Buyers acknowledge and agree that if they use any non designated products in automotive applications TI will not be responsible for any failure to meet such requirements Following are URLs where you can obtain information on other Texas Instruments products and application solutions
20. oid the op amp saturating to a rail a 200kO resistor is put in place The resistor serves as a load for the op amp when the Vyuo pin is in 3 state mode However as a result there is an error of 1 on the Vyoy sur Signal when relaying a signal 6 2 Digital Control The digital control signals can be applied directly to J1 top or bottom side The modular DAC7716EVM can also be connected directly to a DSP or microcontroller interface board No specific evaluation software is provided with this EVM however various code examples are available that show how to use EVMs with a variety of digital signal processors from Texas Instruments Check the respective product folders or send an e mail to dataconvapps list ti com for a listing of available code examples The EVM Gerber files are also available on request 6 DAC7716EVM SBAU159 October 2009 Submit Documentation Feedback Copyright 2009 Texas Instruments Incorporated J TEXAS INSTRUMENTS www ti com EVM Operation 6 3 Default Jumper Settings and Switch Positions Figure 2 shows the jumpers found on the EVM and the respective factory default conditions for each Figure 2 DAC7716EVM Default Jumper Locations Jumper JP1 controls whether the LDAC signal is controlled by J2 15 or J2 17 By default the LDAC signal is controlled by J2 17 but can be changed using JP1 Jumpers JP2 JP3 JP4 and JP5 are used to control the gain of the individual DAC channels By default the jumpers a
21. ormation on updating the DAC SBAU159 October 2009 Submit Documentation Feedback Copyright 2009 Texas Instruments Incorporated I TEXAS INSTRUMENTS www ti com Power Supplies 4 Power Supplies Samtec part numbers SSW 105 22 F D VS K and TSM 105 01 T DV P provide a 5 pin dual row header socket combination at J3 Table 3 lists the configuration details for J3 The voltage inputs to the DAC can be applied directly to the device The DAC7716 requires multiple power supplies to operate AVDD AVSS DVDD and IOVDD are required to properly power the DAC Table 3 J3 Configuration Power Supply Input Pin No Pin Name Function Required J3 1 VA 4 75V to 24V analog supply Yes J3 2 VA 18V to 4 75V analog supply Yes J3 3 5VA 5V analog supply No J3 4 5VA 5V analog supply No J3 5 DGND Digital ground input Yes J3 6 AGND Analog ground input Yes J3 7 1 8VD 1 8V digital supply Optional J3 8 3 3VD 3 3V digital supply Optional J3 9 VD1 Not used No J3 10 5VD 5V Yes The Digital and Analog ground inputs are short circuited internally through a ground plane The dc logic voltage for the DAC7716 IOVDD is selectable between 3 3VD 1 8VD or 5VD via the JP8 jumper These power supply voltages are referenced to digital ground The DAC7716EVM is designed to work in either unipolar and bipolar mode Each mode requires different power supply connections Consult the DAC7716 data she
22. re removed resulting in each DAC channel having a gain of 4 The gain of the output channel is 2 when the corresponding jumper is in place JP6 and JP7 control the signals applied to REFGND A and REFGND B on the DAC7716 By default a jumper is placed across JP6 2 and JP6 3 as well as JP7 2 and JP7 3 This jumper connects REFGND A and REFGND B to the ground of the board when an onboard reference is used When an external reference source is used it is recommended that this jumper stay in place and configure the external reference source to share a common ground with the EVM See the Reference Voltage section for more information Jumper JP8 is used to control the digital voltage for IOVDD By default a jumper is in place to short circuit pins JP8 1 and JP8 2 to use a 3 3V digital supply If pins JP8 3 and JP8 4 are connected a 1 8V digital supply will be used If pins JP8 5 and JP8 6 are connected a 5V digital supply will be used for IOVDD Jumper JP9 is not installed If the user desires to disconnect RFB1 from Vout the trace between JP9 must be cut JP9 can then be installed SBAU159 October 2009 DAC7716EVM 7 Submit Documentation Feedback Copyright 2009 Texas Instruments Incorporated I TEXAS INSTRUMENTS Schematics and Layout www ti com Switch S1 allows the user to pull down four control signals to ground LDAC Uni Bip B RST and Uni Bip A can be pulled low using the switch By default switch position S1 1 is open causing LDA
23. rom TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from TI under the patents or other intellectual property of TI Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties conditions limitations and notices Reproduction of this information with alteration is an unfair and deceptive business practice TI is not responsible or liable for such altered documentation Information of third parties may be subject to additional restrictions Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice TI is not responsible or liable for any such statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications and acknowledge a
24. t voltage range of 16 5V to 21V and the output voltage range of 15V to 15V Exceeding the specified input range may cause unexpected operation and or irreversible damage to the EVM If there are questions concerning the input range please contact a TI field representative prior to connecting the input power Applying loads outside of the specified output range may result in unintended operation and or possible permanent damage to the EVM Please consult the EVM User s Guide prior to connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 30 C The EVM is designed to operate properly with certain components above 60 C as long as the input and output ranges are maintained These components include but are not limited to linear regulators switching transistors pass transistors and current sense resistors These types of devices can be identified using the EVM schematic located in the EVM User s Guide When placing measurement probes near these devices during operation please be aware that these devices may be very warm to the touch Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright O 2009 Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries Tl reserve the right to make corrections
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