DAC - Texas Instruments
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1. 1011E 36 ND 1011E 36 ND 1011E 36 ND 1011E 36 ND 1011E 36 ND 5803 21 ND ED1609 ND A26529 40 ND 1011E 36 ND 445 1543 1 ND 1011E 36 ND 1011E 36 ND 1011E 36 ND C ENT 11 Value 200pF 0 1uF 1uF RED LED HEADER 4X2 0 ADDRESS SELECT VREF VREF L VA VA SELECT 3P3V wv4s VIN WVA VOUT LED 1K 510 AGND VA 3P3V REMOTE DAC121C085 24C02 http Awww national com APPENDIX A1 0 Summary Tables of Test Points Jumpers and Connectors Test Points on the DAC121C08XEB Evaluation Board TP1 AGND Ground Located at the top center of the board TP2 AGND Ground Located at the top center of the board TP3 AGND Ground Located at the bottom right of the board Connectors on the DAC121C08XEB Evaluation Board J1 WV4S Header Wave Vision 4 Serial connector Stuffed on the bottom side of the board intentionally J2 Terminal Block VREF AGND VA REMOTE External power supply connector J3 Serial Interface Serial Interface header Logic Input Refer to Figure 2 for a pin out diagram Header J4 SMA Connector VOUT AC AC Coupled Analog Output J5 2 pin Header VOUT DC Coupled Analog Output Selection Jumpers on the DAC121C08XEB Evaluation Board Refer to Table 1 in Section 4 0 for configuration details JP4 Vout Load Select Configures the load on Vout Refer to Table 1 JP5 20 Address Configures the DAC s IC address Refer to Table 1 Note Changes to the pin configured2. In Computer mode the board can be powered by either an external supply or the local WaveVision4 board supply In Stand alone mode the Evaluation Board must be powered by an external supply If you wish to use the local supply from the WaveVision4 Board place a jumper across pins 1 and 2 of JP9 This connection will supply 5V to V4 on the DAC board To set Vgee V simply short pins 2 3 of JP7 For WaveVision to recognize the board the 3P3V supply must be enabled as well Do this by placing a jumper across pins 1 and 2 of JP10 The board comes configured to use the local supply The default jumper settings are shown in Figure 1 If you wish to supply V4 externally connect a DC voltage supply to connector J2 Connect GND to the center terminal and V4 to the bottom terminal Place a jumper across pins 2 and 3 of JP9 to select Va REMOTE This voltage Va can be set anywhere from 2 7V to 5 5V The source of Vrer is controlled by the JP7 jumper To set Vrer Va Short pins 2 3 To use an external Vrer from the top terminal of J2 short pins 1 amp 2 Refer to Figure 6 for a diagram of the power supply connections Figure 6 Power Supply Connections Typical supply currents when applying an external supply to Va and Vger are as follows e 3 3V 7mA e For V 5 0V 12 12m A Note These values are specified for a continuously operating DAC in High Speed Mode driving a full scale sinewave output The
3. products are designated by 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 Products Applications Audio www ti com audio Automotive and Transportation www ti com automotive Amplifiers amplifier ti com Communications and Telecom www ti com communications Data Converters dataconverter ti com Computers and Peripherals www ti com computers DLP Products www dlp com Consumer Electronics www ti com consumer apps DSP dsp ti com Energy and Lighting www ti com energy Clocks and Timers www ti com clocks Industrial www ti com industrial Interface interface ti com Medical www ti com medical Logic logic ti com Security www ti com security Power Mgmt power ti com Space Avionics and Defense www ti com space avionics defense Microcontrollers microcontroller ti com Video and Imaging www ti com video RFID www ti rfid com OMAP Mobile Processors www ti com omap Wireless Connectivity www ti com wirelessconnectivity TI E2E Community Home Page e2e ti com Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright 2012 Texas Instruments Incorporated
4. C slave Select address do not take effect until the DAC is power cycled JP6 1 VREF Enables Vref supply to the DAC Also used to measure isolated Veer current JP7 Vrer Select Selects the Vrer source Vrer is either supplied externally or connected to Va by this jumper JP8 VA Enables Va supply to the DAC Also used to measure isolated Va current JP9 V4 Select Selects the Vref source Vrer is either supplied externally or connected to Va by this jumper JP10 3P3V Select Selects the 3 3V source for powering the WaveVision EEPROM U3 Always set to pins 1 and 2 for WavevVision operation 12 http Awww national com Blank Page 13 http Awww national com BY USING THIS PRODUCT YOU ARE AGREEING TO BE BOUND BY THE TERMS AND CONDITIONS OF NATIONAL SEMICONDUCTOR S END USER LICENSE AGREEMENT DO NOT USE THIS PRODUCT UNTIL YOU HAVE READ AND AGREED TO THE TERMS AND CONDITIONS OF THAT AGREEMENT IF YOU DO NOT AGREE WITH THEM CONTACT THE VENDOR WITHIN TEN 10 DAYS OF RECEIPT FOR INSTRUCTIONS ON RETURN OF THE UNUSED PRODUCT FOR A REFUND OF THE PURCHASE PRICE PAID IF ANY The DAC121C08XEB DAC101C08XEB amp DACO081CO08XEB Evaluation Boards are intended for product evaluation purposes only and are not intended for resale to end consumers are not authorized for such use and are not designed for compliance with European EMC Directive 89 336 EEC or for compliance with any other electromagnetic compatibility requirements National Sem
5. by connecting this board to National Semiconductors Data Capture Board order number WAVEVSN BRD 4 4 The Data Capture WV4 Board is connected to a personal computer running WaveVision software through a USB port The WaveVision4 software runs on Microsoft Windows and the latest version can be downloaded from the web at http www national com adc Note WaveVision Software version 4 4 or later is required to evaluate this part with the WV4 Evaluation System The WaveVision software allows the user to drive the DAC121C085 with a variety of preset waveforms and custom waveforms The software also allows the user to configure the C serial Interface Data transmitted to the DAC121C085 via the lC interface is converted to an analog waveform by U1 the DAC121C085 JP4 J4 Output Load Vout J2 Va Input JP9 Va Select Figure 1 Component and Test Point Locations http Awww national com 2 0 Board Assembly The DAC121C08XEB evaluation board comes fully assembled and ready for use Refer to the Bill of Materials for a description of components to Figure 1 for major component placement and to Figure 12 for the Evaluation Board schematic 3 0 Quick Start The evaluation board may be used in the Stand Alone mode or Computer mode In Stand Alone mode a Pattern Generator is used to interface to the DAC s IC Interface In Computer Mode a WaveVision4 Board is used to drive the DAC s lC interface In either case a Sig
6. A FC Interface Speed 100 kHz 400kHz or 3 4 MHz Analog Out AC Coupled VA 2 to Va 2 Output Range User Selectable 2KO 200pF or http Awww national com 7 0 Hardware Schematic Atdt Atdt um avv CA apy pn EdE 9dl Waa AM EE d AM AfdE orar Nd a B zn 103138 VA sg0olzLova VAJA JX3 d34A Hh 47 EESIN Lar 103135 ssauaav Sar o exp yaava E ay tar anov bdl http Awww national com Figure 12 DAC121C08XEB Evaluation Board Schematic 10 8 0 Evaluation Board Bill of Materials PCB Footprint rc0603 rc0603 c1206 D1206 21 hdr2x2 hdr1x7 Quantity Reference JP5 nari naria rh EDT23 bergzxTp SMA hare 7206 5555 5555 5555 5655 ip SOc0dp ip 90 ip 60 mso8SD 8 s0705 1 Us se8 hdr1x2 hdr1x3 hdr1x2 r Source E a ical Eq ERE EE perg Source Part 516 1440 1 ND 1011E 36 ND
7. Bill of Matertals 2 rere acide dundee 11 A1 0 Summary Tables of Test Points Jumpers and Connectors 12 2 http Awww national com 1 0 Introduction The DAC121CO08XEB Design Kit consisting of the DAC Evaluation Board and this User s Guide is designed to ease evaluation and design in of National Semiconductor s DAC121C081 DAC121C085 family of Digital to Analog Converters DACs The Micro Power DACs feature Rail to Rail Output and an I C Compatible interface This User s Guide supports all three resolutions of the DAC family The evaluation board comes with the full featured MSOP 8 version of the DAC For the 12 bit resolution the DAC121C085 is used For the 10 bit resolution the DAC101C085 is used For the 8 bit resolution the DAC081C085 is used All the devices in the family DAC121C085 DAC101C085 and DAC081C085 will be referred to as the DAC121C085 in this document The evaluation board can be used in either of two modes In the Stand Alone mode suitable test equipment such as a pattern generator and signal analyzer can be used with the board to evaluate the DAC121C085 performance JP5 3P3V Select Add Select JP10 3p3V AGND vay are REM BEO 9 S 1 J1 WVAS Connector 8 Cotional Semiconductor DACI21C0eM Evalvotion Board Rev 1 J3 WV4 Connector U1 DAC121C085 In the Computer mode data capture and evaluation is simplified
8. C08XEB Connection 3 3V SDA EEPROM N C N C SCL DAC GND SDA DAC Figure 4 J1 WV4S Header Perform step 7 of section 3 1 to configure the loading of the analog output Vour Perform step 8 of section 3 1 to configure the lC slave address of the DAC Connect a clean not switching 5 0V power source with a 350mA current limit to power connector J1 on the WV4 board Turn on the power supply Refer to Section 5 0 on Software Operation and Settings to setup the WaveVision 4 software http www national com 4 0 Functional Description 4 1 Jumper Settings Table 1 describes the function of the various jumpers on the DAC121C08XEB evaluation board The evaluation board schematic is shown in Figure 12 JP4 Vour Load Select See Below JP5 l C Address Select See Below JP6 Enable Vref supply to the DAC Use external Jer Veer from J2 Set Vrer Va JP8 Enable Va supply to the DAC JP9 Use VA from the Use external Va WVA board from J2 Use 3 3V supply Use external JP10 from the WV4 3 3V supply from board TP6 a Jumper JP4 Vou Load Select Connect a 200pF load capacitance p from Vout to GND ibas Connect a 2 load resistance from p R Vout to GND Jumper JP5 Pc Address Select Address 0x0C No jumpers 0x0D Short pins 2 amp 3 OxOE Short pins 1 amp 2 0x08 Short pins 6 amp 7 0x09 S
9. Dec 19 2007 Rev 1 0 CMC QQ National Semiconductor Evaluation Board User s Guide DAC121C08XEB DAC101C08XEB DAC081C08XEB Micro Power Digital to Analog Converter DAC with an I C Compatible Interface 12 bit 10 bit 8 bit DAC121C085 DAC101C085 DAC081C085 DAC121C081 DAC101C081 DAC081C081 19 3 3 AGND Var e o AGND T 5 i p 2 Xx L 1 n 1 R x s s s A co gt A R VI L1 Fr H um RE om L onal Semiconductor 1219088 Evolucation Board 1 http www national com Table of Contents LOS IMPFOCIUIC HON PC 3 2 0 Board Assembly e 4 re Ree 4 3 1 Stand Alone MOHE le Gat 4 3 2 EM 5 4 0 Functional DeSCription ccccceccccceeeeeeeeeeeeeeeeeeeeaaeaaeeeeeeeeeeeaaaaeaaaaeeeeeeeseesaaas 6 4 1 Jumper Setting Sceni een nrn teo od tow Er aids 6 6 4 3 DAC Reference Circuitry esee enne nnne 6 4 4 Analog Output tn to Kai e EE ede aab RE LR Ree 7 4 5 Power Supply GonnectlOns sic aci eue pe Er ra kr nas GiGi 7 5 0 Software Operation and Settings oases ccena De ded un eate D co tua cda 8 6 0 Evaluation Board Specifications ssssssss 9 7 0 Hardware cendenenscide 10 8 0 Evaluation Board
10. cal applications such as life support where a failure of the 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 and 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
11. hort pins 2 amp 3 and pins 6 amp 7 Short pins 1 amp 2 and pins 6 amp 7 0x4C Short pins 5 amp 6 0x4D Short pins 2 amp 3 and pins 5 amp 6 0x4E Short pins 1 amp 2 and pins 5 amp 6 Table 1 Jumper Configurations 4 2 20 Interface The DAC supports all three C speeds including Hs Mode 3 4MHz In Hs Mode the maximum DAC conversion rate is 188 9kHz The board is designed with 1kQ l C pull up resistors on both the SDA and SCL lines R6 amp R7 Also series resistors for SCL and SDA are designed into the board R8 amp R9 The board is shipped with 510 series resistors which can be increased to interface to a noisy lC bus In Computer Mode the lC interface is driven by the WaveVision4 board The WaveVision4 software allows the user to drive the DAC121C085 with various digitized signals Refer to Section 5 0 Software Operation and Settings for further information In Stand Alone Mode the lC interface must be driven by an external device See section 1 4 5 of the DAC121C081 DAC121C085 datasheet for a typical write sequence timing diagram The maximum digital input level of the c interface depends on the analog supply voltage Va The interface operates at normal CMOS logic levels See the Electrical Characteristics section of the datasheet for further details The SDA signal is accessible by connecting to pin 2 of the WV4 connector J3 The SCL signal is accessible by connecting to pin 6
12. iconductor Corporation does not assume any responsibility for use of any circuitry or software supplied or described No circuit patent licenses are implied LIFE SUPPORT POLICY NATIONAL S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems 2 A critical component is any component in a life support which a are intended for surgical implant into the body device or system whose failure to perform can be or b support or sustain life and whose failure to reasonably expected to cause the failure of the life perform when properly used in accordance with support device or system or to affect its safety or instructions for use provided in the labeling can be effectiveness reasonably expected to result in a significant injury to the user National Semiconductor Corporation National Semiconductor Europe National Semiconductor National Americas Fax 49 0 1 80 530 85 86 Asia Pacific Customer Semiconductor Tel 1 800 272 9959 Email europe support nsc com Response Group Japan Ltd Fax 1 800 737 7018 Deutsch Tel 49 0 699508 6208 Tel 65 2544466 Tel 81 3 5639 7560 Email support nsc com English Tel 49 0 870 24 0 2171 Fax 65 2504466 Fax 81 3 5639 7507 Francais Tel 49 0 141 91 8790 Email sea support nsc com www national co
13. m National does not assume any responsibility for any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications 14 http Awww national com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries Tl reserve the right to make corrections 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 5 standard warranty Testing and other quality control techniques are used to the extent Tl 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 doe
14. majority of this current is for powering devices external to the DAC121C085 such as the pull up resistors and the LED http www national com 5 0 Software Operation and Settings The WaveVision4 software is included with the WaveVision4 board and the latest version can be downloaded from National s web site at http www national com adc WaveVision4 software version 4 4 or later is required to evaluate this device with the WV4 system To install this software follow the procedure in the WaveVision4 Board User s Guide Once the software is installed run it and set it up as follows Note Before continuing ensure that the WaveVision Hardware is setup according to Section 3 2 1 From the WaveVision main menu go to Settings then Capture Settings to open the System Settings dialog Under board type select WaveVision4 USB Turn on the power to both boards then click on the Reset button and await the firmware download After the firmware has downloaded WaveVision will open up a control panel window for the DAC121CO08XEB 4 Click on the Close button to close the System Settings Dialog 5 Navigate to the DAC121CO08XEB Evaluation Board window 6 Configure the Interface speed as seen in Figure 7 Standard mode Fast Mode and High Speed mode are supported Interface Settings I2C Speed High Speed 3 3MHz v High Speed 3 3MHz Fast Mode 400kHz Std Mode 100kHz Figure 7 rc Speed Select 7 Config
15. nal Analyzer is used to evaluate the analog output signal 3 1 Stand Alone Mode Refer to Figure 1 for locations of test points and major components 1 Connect a clean analog not switching 5V power source to Power Connector J2 on the DAC121CO8XEB board Ground the middle terminal and connect 5V to the bottom terminal closest to JP9 2 Make the following required jumper connections see Table 1 for more details JP9 pins 2 amp 3 JP7 pins 2 amp 3 JP6 pins 1 amp 2 JP8 pins 1 amp 2 3 Turn on the power source 4 Configure a pattern generator or other 0 master device to interface to the DAC121C085 Refer to the timing diagrams in the datasheet for further timing details The DAC supports any of the three standard speed ranges Ensure the master device is configured to drive 5V CMOS logic 5 Connect the master device to Serial Interface Header J3 WV4 Refer to Figure 2 below for connection details NOTE The board comes with pull up resistors R6 and R7 Any other pull ups on the l C bus must be disabled Figure 2 J3 WV4 Interface Header 6 The Analog Output signal can be seen DC coupled at J5 or AC coupled at SMA connector J4 See the board schematic of Figure 12 for details 7 Select the desired output load by adding jumpers to JP4 Connect a jumper across the two left pins near the C to add a 200pF load capacitance to ground Connect a jumper across the two right side pins nea
16. of J3 Please refer to section 1 4 of the datasheet for a detailed description of the C interface Refer to the Philips I2C Specification for further details 4 3 DAC Reference Circuitry The reference voltage for the DAC121C085 is selected by JP7 See Table 1 for details The reference can either be selected as the V4 supply or an externally supplied voltage 92 The analog output range of the DAC121C085 can be scaled by adjusting the reference voltage Vreer The lower the Vgge the smaller the output range Veer can be set anywhere from 1 0V to Va is independent of Vrer and can be set anywhere from 2 7V to 5 5V In any case Vrer has little to no PSRR and must be as clean as possible to reduce noise feedthrough on Vout http Awww national com 4 4 Analog Output The analog output of this Eval board is available in two places For a DC coupled output pin 1 of J5 provides Voyr and pin 2 provides AGND An AC coupled output is provided by the SMA connector J4 See Figure 5 below for details If using a spectrum analyzer to look at the output of the DAC the AC coupled output J4 is recommended For very low frequency i e less than 1kHz use J5 to see the output signal DC coupled For an AC coupled output at low frequencies simply replace the AC coupling capacitor at C9 with a larger capacitor Use the J4 SMA to look at the AC coupled output a Figure 5 Analog Output 4 5 Power Supply Connections
17. r the R to add a 2 resistive load See Table 1 for jumper configurations 8 The DAC121C085 will respond to lC address Ox0C by default with pins AO and A1 floating Change the slave address of the DAC by adding jumpers to JP5 is controlled by pins 1 2 amp 3 of JP5 A1 is controlled by pins 5 6 amp 7 Refer to Table 1 for a detailed description of the I C Slave address settings NOTE Jumper Setting changes to the pin configurable slave address will not take effect until the DAC is power cycled http Awww national com 3 2 Computer Mode Refer to Figure 7 for locations of test points and major components The board comes configured for plug and play WaveVision evaluation 1 Run the WaveVision 4 program version 4 4 or higher is required to interface to the WVA board While the program is loading continue below 2 Connect a USB cable between the WV4 board and the PC running the WaveVision 4 software 3 Make the following required jumper connections see Table 1 for more details JP9 pins 1 amp 2 JP7 pins 2 amp 3 JP6 pins 1 amp 2 JP8 pins 1 amp 2 e JP10 pins 1 amp 2 4 Connect the J1 header on the DAC121C08XEB evaluation board to the WV4 serial connector J7 on the WV4 board Refer to Figure 3 for the serial connection and Figure 4 for the J1 header pin out Note J1 on the DAC121CO8XEB is intentionally stuffed on the bottom side of the board Figure 3 WV4 to DAC121
18. re the digital waveform to be converted by the DAC as seen in Figure 11 Please see the WaveVision4 User s Manual for detailed instructions The ability to drive preset waveforms or custom data is provided DAC121COBXEB Evaluation Board Wavetorm Selection Sine v Freq Hz 1002 51 Samples Cycle 175 2 88 to 43860 0 Amplitude Amplitude 100 1 to 100 Center data O Linear Range O Minimax Invert Data Figure 11 Waveform Configuration 11 Press the Start button to begin driving the digital waveform to the DAC The WaveVision4 Board will continuously send the waveform out to the DAC over the I C interface until the Stop button is pressed Please refer to Section 4 4 for details on measuring the Analog Output of the DAC The Digital Waveform is plotted in the main WaveVision window for added convienience This waveform may be further analyzed by clicking on the magnifying glass icon then clicking and dragging across a specific area of the plot for better data inspection See the WaveVision4 Board User s Guide for details If this board is used in conjunction with the WaveVision4d Data Capture Board X and WaveVision software a USB cable is needed to connect WaveVision4 Board to the host computer See the WaveVision4 Board User s Guide for details 6 0 Evaluation Board Specifications 28 x20 72 om x54 cm Power Requirements Min 2 7V 6 Max 5 5V 16m
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20. ure the address of the DAC The DAC121C085 will respond to lC address Ox0C by default with pins AO and A1 floating no jumpers on JP5 Change the lC slave address of the DAC by adding jumpers to JP5 Refer to Table 1 for a detailed description of the I C address settings The address in Figure 8 must match the address configured by AO and A1 NOTE Jumper Setting changes to the pin configured slave address will not take effect until the DAC is power cycled I2C Address hex C Start Waveform Figure 8 lC Address 8 Perform register level control of the DAC by writing 16 bit words to the DAC Data Register To write the DAC simply type a 16 bit hex value into the Manual DAC Control field and press Enter or click the Write DAC Register button See Figure 9 Normal Operation Sta IHi Z outputs Register Level Control SkOhm load to GND 1 00kOhm load to GND Power down Normal Operation v v 16 bit hex value Write DAC Register Figure 9 Manual DAC Control Manual DAC Control 0 9 To put the DAC into power down mode select a power down option from the Power down Mode box and click the Set Mode button normal Operation Sta Hi Z outputs Register Level 5kOhm load to GND 1 O0kOhm load to GND Power down Made Normal Operation Set Mode Manual DAC Control 0 16 bit hex value Write DAC Register Figure 10 DAC Power down Control http Awww national com 10 Configu
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