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eval - ad7902sdz user guide ug - 608 one technology way ? p. o . box 9106 ? norwood, ma 02062 - 9106, u.s.a. ? tel: 781.329.4700 ? fax: 781.461.3113 ? www.analog.com evaluati ng t he ad7902 dua l pseudo differential , 1 6 - bit, 1 msps pulsar adc please see the last page for an important warning and legal terms and conditions . rev. 0 | page 1 of 32 features full featured evaluation board for the ad7902 versatile analog signal conditioning circuitry on - board reference, reference buffers , and adc d rivers system demonstration board compatible ( eval - sdp - cb1z ) pc software for control and data analysis of time and frequen cy domain evaluation kit contents eval - ad7902sdz evaluation board wall power supply 9 v dc adapter daughter card power connector additional equipment / software needed s ystem demonstration platform ( eval - sdp - cb1z ) precision analog signal s ource power s upply, +7 v/ ? 2.5 v (o ptional) usb cable sm a cable pc running windows xp sp2, windows vista, windows 7 , or higher with usb 2.0 port evaluation software for the ad7902 (download from ad7902 product page) online resources documents needed ad7902 data sheet eval - ad7902sdz user guide required software eval - ad7902sdz evaluation software faqs and troubleshootin g typical setup figure 1. typical setup for the eval - ad7902sdz (e val - ad7902sdz on left and eval - sdp - cb1z on right) signa l source sma connec t or pc 1 1798-001
ug- 608 eval - ad7902sdz user guide rev. 0 | page 2 of 32 table of contents features .............................................................................................. 1 evaluation kit contents ................................................................... 1 additional equipment/software needed ...................................... 1 online resources .............................................................................. 1 typical setup ..................................................................................... 1 revision history ............................................................................... 2 general desc ription ......................................................................... 3 getting started .................................................................................. 4 software installation procedures ................................................ 4 evaluation board setup procedures ........................................... 7 evaluation board hardware ............................................................ 8 devi ce description ....................................................................... 8 power supplies .............................................................................. 8 link configuration options ......................................................... 10 ev aluation board circuitry ........................................................... 11 analog inputs .............................................................................. 11 reference ..................................................................................... 11 serial interface ............................................................................ 11 modes of ope ration ....................................................................... 12 sdp controlled mode ............................................................... 12 standalone mode ........................................................................ 12 how to use the software ............................................................... 13 setting up the system for data capture: board operation/connection sequence ................................. 13 starting the software .................................................................. 13 overview of the main window ................................................ 15 generating a waveform analysis report ................................ 16 generating a histogram of the adc code distribution ..... 17 generating a fast fourier transform of ac characteristics ...... 18 generating a summary of the waveform, histogram, and fast fourier transform .............................................................. 19 evaluation board schematics and artwork ................................ 20 e va l - ad7902sdz schematics ............................................... 20 e va l - ad7902sdz layout ....................................................... 26 bill o f materials ............................................................................... 29 related links ................................................................................... 31 revision history 2 /14 rev ision 0: initial version
eval - ad7902sdz user guide ug- 608 rev. 0 | page 3 of 32 general description the e va l - ad7902sdz is an evaluation board designed to demonstrate the low power ad7902 performance and to provide an easy to understand interface for a variety of system applications. the ad7902 is a dual pseudo differential 16 - bit, 1 msps pulsar? adc. a full description of the ad7902 is available in the ad7902 data sheet and should be consulted when using this evaluation board. the evaluation board is ideal for use with the analog devices, inc., system demonstration platform (sdp) board, eval - sdp - cb1z . the evaluation board interfaces to the sdp board via a 120 - pin connector. sma connectors j6, j10, j14 , and j15 are provided to connect a low noise analog signal source. the user pc software exec utable controls the evaluation board over the usb through the sdp board, eval - sdp - cb1z . on - board components include the following: adr 435: high precision, buffered band gap 5.0 v reference ad8031 : referenc e buffer ada48 41- 1 : signal conditioning circuit with op amps adp7104 and adp2301 : regulators to derive necessary voltage levels on board
ug- 608 eval - ad7902sdz user guide rev. 0 | page 4 of 32 getting started software installatio n procedures download t he evaluation board softwar e from the ad7902 product page on the analog devices website, at www.analog.com . there are two parts to the installation: ? ad7902 evaluation board software installation ? eval - sdp - cb1z system demonstrat ion platform board drivers installation warning install t he evaluation board software and drivers before connecting the evaluation board and eval - sdp - cb1z board to the us b port of the pc to ensure that the evaluation system is correctly recognized when it is connected to the pc. installing the ad7902 evaluation board software to install the ad7902 evaluation board software, 1. start the windows operating system and download the software from the ad7902 product page on the analog devices website, at www.analog.com . 2. unzip the downloaded file. 3. double - click the setup.exe file to begin the evaluation board software installation (see figure 2 ). figure 2. ad7902 evaluation board software installation: installation begins 4. selec t the location to install the software, and then click next . (the default location is c: program files (x 86 ) analog devices ad790203 evaluation software . this location also contains the executable software and example files.) figure 3. ad7902 evaluation board software installation: selecting the location for software installation (the default location is shown) 5. a license agreement appears. read the agreement, and then select i accept the license agreement and click next . figure 4. ad7902 evaluation board software installation: accepting the license agreement 11798-003 11798-004 11798-005
eval - ad7902sdz user guide ug- 608 rev. 0 | page 5 of 32 6. a summary of the installation is displayed. click next to continue. figure 5. ad7902 evaluation board software instal lation: reviewing a summary of the installation 7. a dialog box shows the installation progress. figure 6. ad7902 evaluation board software installation : displaying installation progress 8. the dialog box informs you when the installation is complete. click next . figure 7. ad7902 evaluation board software installation: indicating when the installation is complete 9. the setup for the installation of the eval - sdp - cb1z system demonstration platform b oard drivers auto - matically begins to load. figure 8. loading the setup for sdp drivers installation installing the eval - sdp - cb1z system demons tration platform board drivers after the installation of the evaluation board software is complete, a welcome window is displayed for the installation of the eval - sdp - cb1z system demonstration platform board drivers. 1. make sure that all other applications are closed, and then click next . figure 9. eval - sdp - cb1z drivers setup: beginning the drivers installation 11798-006 11798-007 11798-008 1 1798-009 11798-010
ug- 608 eval - ad7902sdz user guide rev. 0 | page 6 of 32 2. select the location to install the drivers, and then click install . figure 10 . eval - sdp - cb1z drivers setup: selecting the location for drivers installation 3. installation of the sdp drivers begins. figure 11 . eval - sdp - cb1z d rivers setup: beginning the installation 4. a dialog box appears asking whether you would like to install this device software. click install to confirm that you would like to install the drivers. figure 12 . eval - sdp - cb1z drivers setup: granting permission to install drivers 5. to complete the drivers installation, click finish , which closes the installation wizard. figure 13 . eval - sdp - cb1z drivers setup: completing the drivers setup wizard 6. before using the evaluation board, you must restart your computer. a dialog box opens, giving you the following options: restart , shut down , restart later . click the appropriate button. figure 14 . eval - sdp - cb1z drivers set up: restarting the computer 11798-011 11798-012 1 1798-013 11798-014 11798-015
eval - ad7902sdz user guide ug- 608 rev. 0 | page 7 of 32 evaluation board set up procedures the ad7902 evaluation board connects to the ( e va l - sdp - cb1z ) system demonstration board. the e va l - sdp - cb1z board is the controller b oard, which is the communication link between the pc and the main evaluation board. figure 1 shows a photograph of the connections made between the e va l - ad7902sdz daughter board and the e va l - sdp - cb1z motherboard. connecting the eval uation and sdp boards to a pc 1. install the ad7902 software. ensure that the e va l - sdp - cb1z board is disconnected from the usb port of the pc while installing the software. the pc must be restarted after the installation is complete. 2. before connecting power, connect the 120 - pin connector, j5, of the e va l - ad7902sdz board to connector j4 on the e va l - sdp - cb1z board. nylon screws are included in the e va l - ad7902sdz evaluation kit and can be used to ensure that the e va l - ad7902sdz and e va l - sdp - cb1z boards are connected firmly together. 3. connect the 9 v power supply adapter included in the kit to the e va l - sdp - cb1z . 4. connect the e va l - sdp - cb1z board to the pc via the usb cable. (if you ar e using windows? xp, you may need to search for the e va l - sdp - cb1z drivers. choose to auto - matically search for the drivers for the e va l - sdp - cb1z board if prompted by the operating system.) verifying the board connection 1. allow the found new hardware wizard to run after the e va l - sdp - cb1z board is plugged into your pc. (if you are using windows xp, you may need to search for the e va l - sdp - cb1z drivers. choose to automatical ly search for the drivers for the e va l - sdp - cb1z board if prompted by the operating system.) 2. check that the board is connected to the pc correctly using the device manager of the pc. a. access the device manager as follows: i. right - click my computer and then click manage . ii. a dialog box appears asking for permission to allow the program to make changes to your computer. click ye s . iii. the computer management box appears. from the list of sy ste m to ols , click device manager . b. under adi development tools , analog devices system development platform sdp -b should appear (see figure 15) , indicating that the e va l - sdp - cb1z driver software is installed and that the board is connected to the pc correctly. figure 15 . device manager: checking that the board is connected to the pc correctly 11798-016
ug- 608 eval - ad7902sdz user guide rev. 0 | page 8 of 32 evaluation board har dware device description the ad7902 is a 16- bit , 1 msps , precision, power efficient, dual pseudo differential pulsar adc that uses sar - based architecture and does not exhibit any pipeline delay or latency. th e ad7902 is specified for use with a single supply of 2.5 v (vdd1, vdd2). the interface from the digital host to the ad7902 uses 1.8 v /2.5 v/3.3 v/5.5 v logic. the ad7902 is compatible with the spi/qspi/microwire/dsp serial interface to transfer data conversions. complete ad7902 specifications are provided in the ad7902 data sheet and should be consulted in conjunction w ith this user guide when using the evaluation board . full details on the e va l - sdp - cb1z are available on the analog devices website , at www.analog.com . figure 26 to figure 31 show the evaluation board schematic s. the board consists of an ad7902 adc ( u1 ) with a reference ( u6 adr 435) , and two adc drivers ( u12 and u17 ada4841 - 1yrz ). the evaluation board is a flexible design that enables you to adjust compensation components and operat e the evaluation board from an adjustable bench top power supply. power supplies the evaluation board can be powered from a wall adapter or from a be nch top power supply. by default, the board is set up to operate from a 9 v wall adapter using the on - board power supplies described in table 1 . table 1 . power supplies provided on the board power supply (v) function components used +5 sdp power adp2301 +7.5 positive rail adp7104 ? 2.5 negative rail adp2301 +2.5 adc v dd rail adp7104 +3.3 v drive (digital power) adp7104 each on - board power supply is decoupled where it enters the board as well as where it connects to each device. a single ground plane is used on this board to minimize the effect of high frequency noise interference. alternatively, the board can be powered from a bench top power supply by using the j2 and j3 screw terminals and changing the sl1 to sl4 and lk3 to lk5 solder link settings to position b (see table 2 ) . when bench top power is used, use of the wall adapter and the on - board power suppl ies are no longer required. table 2 . solder links settings for bench top power supply 1 link setting function sl1 b +v s sl2 b ? v s sl3 b ? v s sl4 b +v s lk3 b v_sdp lk4 b v ref lk5 b v dd for adc 1 all other solder link setting s are as described in table 3 .
eval - ad7902sdz user guide ug- 608 rev. 0 | page 9 of 32 figure 16 . simplified evaluation board functional block diagram 11798-002 sdp board ad7902/ad7903 pulsar evaluation board vin1+ vin1? in1+ in1? adc1 +v s ?v s gnd +5v adsp-bf527 dsp sport sck1 sdo1 cnv1 vio1 sdi1 ref1 +7.5v vdd1 ada4841-1 ada4841-1 a b ?2.5v ?2.5v +7.5v gnd vcm ad8031 power supply circuitry adp7104, adp2301 v in = 9v wall adapter vdd vsdp gnd (optional) (optional) +7.5v/?2.5v 2.5v +7.5v 3.3v +5v adr435 glue logic in2+ in2? adc2 sck2 sdo2 cnv2 vio2 sdi2 ref2 +7.5v vdd2 ada4841-1 ada4841-1 a b ?2.5v ?2.5v +7.5v gnd glue logic 2.5v vin2? vin2+ 5v 5v
ug- 608 eval - ad7902sdz us er guide rev. 0 | page 10 of 32 link configuration o ptions care should be taken before applying power and signals to the evaluation board to ensure that all link positions are as required by the operating mode. there are two modes in which to operate the evaluation board. the evaluation board can be operated in sdp controlled mode to be used with the sdp board, or the evaluation board can be used in standalone mode. when operating in sdp controlled mode, ensure that vio is 3.3 v. operating with a vio greater than 3.3 v in sdp controlled mode may damage the sdp board . the setting colu mn of table 3 shows the default positions in which the links are set when the evaluation board is packaged. when the board is shipped , it is assumed that you are going to operate the evaluation board with the sdp board (sdp controlled mode). table 3 . solder links factory default settings link setting function comment sl1 a +v s change to b if using bench supplies. sl2 a ? v s change to b if using bench supplies. sl3 a ? v s change to b if using bench supplies. sl4 a +v s change to b if using bench supplies. sl5 b analog input do not alter . sl6 b analog input do not alter . lk1 a +v s change to b if using bench supplies. lk2 a ? v s change to b if using bench supplies. lk3 a v_sdp change to b if using bench supplies. lk4 a v ref change to b if using bench supplies. lk5 a v dd for adc change to b if using bench supplies. lk6 not applicable not applicable do not place lk7 not applicable not applicable do not place lk8 a adc2 input do not alter. lk9 a adc2 input change to b if using adc1 input. lk10 a u17 input change to b if u17 needs to be bypassed. lk11 a u17 input change to b if u17 needs to be bypassed. lk12 a adc2 input do not alter.
eval - ad7902sdz user guide ug- 608 rev. 0 | page 11 of 32 evaluation board cir cuitry analog inputs the analog inputs to the evaluation board are sma connectors j6 and j1 4 . these inputs are buffered with dedicated amplifier circuitry ( u12 and u17 ) , as shown in figure 26 and figure 27. the circuit not only allows different configurations, input range scal ing, and filtering but also allows adding a dc component and us ing different op amp s and supplies. the analog input amplifiers are set as unity - gain buffers by factory default . the amplifier positive rail is driven from 7.5 v (from u13 adp7104 ). the negative amplifier rail is driven from C v s (generated by u3 adp2301 ). the default configuration sets all op amps ( u12 and u17 ) at midscale, generated from a buffered reference voltage divider (vcm). the evaluation board is configured by factory default for providing a pseudo differential analog input path to adc1 and adc2 (see figure 16) . for dynamic performance, an fft test can be done by applying a very low distortion ac source. for low frequency testing, the audio precision source can be used directly because its outputs are isolated. set the outputs as balanced with a floating ground. the j10 and j15 connectors are provided for balanced termination of a signal source. different sources can be used; however, most are single - ended sources that use a fixed output resistance. by default, t he evaluation board uses the amplifiers as unity - gain buffers . t he noninverting input has a common - mode adjustment that involves a 100 k ? shunt resistor. this resistor creates a voltage divider with the source, which must be accounted for when using the board . reference an external 5 v reference (u6 adr 435 ) is used to supply the adcs directly. serial interface the evaluation board uses the sport interface from the adsp - bf527 d s p. multiple and gates (u9, u10, and u11) are used to clock and gate the sport transfer to the adc device.
ug- 608 eval - ad7902sdz user guide rev. 0 | page 12 of 32 modes of operation sdp controlled mode the ad7902 uses a high speed serial interfac e that allows sampling rates of up to 1 msps. for more information about the operation of the serial interface, refer to the ad7902 data sheet. the ad7902 uses the serial interface to transfer data to the e va l - sdp - cb1z . the e va l - ad7902sdz communicates with the e va l - sdp - cb1z board using level shifters. the e va l - sdp - cb1z operates at a 3.3 v logic level, which allows logic voltages that exce ed 3.3 v to be used without damaging the sdp interface. standalone mode the e va l - ad7902sdz can also be used without the e va l - sdp - cb1z controller board . in this case, the e va l - ad7902sdz is connected to the serial interface using the j5 connector or the test points. for more information about the operation of the serial interface, refer to the ad7902 data sheet.
eval - ad7902sdz user guide ug- 608 rev. 0 | page 13 of 32 how to use the software setting up the syste m for data capture: board operation/conn ection sequence with the evaluation software installed , t he following board operation/connection sequence can be used : 1. connect the sdp controller board to the evaluat ion board via the j5 connector (screw into place as required). the software is configured to find the evaluation board on either the j4 or j5 connector of the sdp board. 2. power the board with the appropriate supply , as described in the power supplies section. 3. connect the e va l - sdp - cb1z board to a pc using the usb cable. 4. start the evaluation software. click start > all programs > ad790 2 _03_evaluation > ad790 2 _03_evaluation_ software . 5. apply a signal source and capture data. starting the software when the software starts running, it searches for hardware connect ed to the pc. the software automatically detects the generic attached to the pc , or you can choose to run the software in standalone mode without any hardware connected. with hardware connected to run the program with hardware connected , 1. click start > all programs > ad790 2 _03_evaluation > ad790 2 _03_evaluation_software . ( to uninstall the program, click start > control panel > add or remove programs > ad790 2 _03_evaluation .) 2. if the sdp board is not connected to the usb port when the software is launched, a co nnectivity error displays (see figure 17 ). if a connectivity error is displayed, connect the evaluation board to the usb port of the pc, wait a few se conds, click rescan , and follow the instructions. figure 17 . sdp board not connected to the usb port pop - up window error 3. after find ing the evaluation board, t he software connects to the board and displays the dialog box shown in figure 18 . figure 18 . software connects to sdp board 4. after the board is correctly detecte d, the main window of the software appears (see figure 21 ), show ing that the e va l - ad7902sdz board is connected. without hardware connected the software can run in standalone mode when no evaluation board hardware is connected to the usb port. 1. click start > all programs > ad790 2 _03_evaluation > ad790 2 _03_evaluation_software . 2. the software automatically seeks to find the hardware connected; therefore, when no hardwa re is connected, a connectivity error is displayed (see figure 19 ). if you wish to continue without hardware in standalone mode, click cancel . figure 19 . no hardware connected pop - up window error 3. the software alert s the user that no hardware is connected and that the software is going to continue in standalone mode. figure 20 . software indicates operating in standalone mode 11798-017 1 1798-018 11798-019 11798-020
ug- 608 eval - ad7902sdz user guide rev. 0 | page 14 of 32 4. y ou can then load example files or previously saved files and analyze data . the main window of the software appears (see figure 21 ), showing the evaluation board connected as the part number from the saved data file. 5. if you de cide to connect hardware at this point, you must close the software and relaunch it to allow it to search for the board again. figure 21 . main window 11798-021
eval - ad7902sdz user guide ug- 608 rev. 0 | page 15 of 32 overview of the main window the main window of the software is shown in figure 21 and has the features described in this section. file menu the file menu offers the choice to ? load data : load previously captured data . ? save data as .tsv : save captured data in .tsv format for future analysis. ? save picture : save the current screen capture. ? print : print the main window to the default printer. ? exit : close the application. eval board connected box the eval board connected box displays the evaluation board con - nected to the usb por t either e va l - ad7902 or e va l - ad7903 . when an evaluation board is not connected to the usb port, the software can be operated in standalone mode for data analysis, and the part information notes the part number from the saved data file. adc settings area the adc settings area allows changing the sampling frequency and the reference v oltage value, as well as selecting channel 1 or channel 2. reference voltage (v) box by default, the external reference voltage is 5 v ( adr 435 on - board reference). the minimum/m aximum voltage calculations are based on this reference voltage. if you change the reference voltage, you must change this input accordingly. sampling freq (hz) box the default sampling frequency (10000000 hz) in the sampling freq (hz) box matches the maximum sample rate of the adc connected to the board. although you can adjust the sampling frequency, there are limitations in terms of the sample frequencies that can be entered related to the sclk frequency applied. the sample frequency must be an integer divider of the sclk frequency. if an unusable sample frequency is input, the software automatically adjusts the sample frequency accordingly. units can be entered as, for example, 10k for 10,000 hz. the software automatically adjusts th e sample frequency according to the ability of the adc connected to the board. for example, if you enter a value that is beyond the ability of the device, the software indicates this and reverts to the maximum sample frequency. select channels checkboxes select either channel 1 or channel 2 or both to read the data from a single adc or both adcs simultaneously . tabs area there are five tabs available in the tabs area of the main window: configure , waveform , histogram , fft , and summary . these tabs display t he data in different formats. navigation tools are provided within each tab to allow you to control the cursor, zooming, and panning (see figure 22 ) within the graphs displayed. each tab is described in more detail in the generating a waveform analysis report ; generating a histogram of the adc code distribution ; generating a fast fourier transform of ac characteristics ; and generating a summary of the waveform, histogram, and fast fourier transform sections. single capture button click ing s ingle capture perform s a single capture from the adc . continuous capture button click ing continuous capture perform s a continuous capture from the adc. num samples box the num samples box allows you to select the number of samples to analyze. exit button clicking the exit button (in the upper right corner of the window) closes the software. alternatively, you can select exit from the file menu.
ug- 608 eval - ad7902sdz user guide rev. 0 | page 16 of 32 generating a waveform analysis report figu re 22 illustrates the wav e fo r m tab for a 1 0 khz sine wave input signal when the on - board 5 v external reference is used . t he waveform analysis area (located toward the bottom of the window) reports the amplitudes recorded from the captured signal and the frequency of the signal tone. select the channel 1 tab or channel 2 tab in the waveform analysis area to view the corresponding waveform. figure 22 . waveform t ab 11798-022 control cursor control panning control zooming
eval - ad7902sdz user guide ug- 608 rev. 0 | page 17 of 32 generating a histogr am of the adc code distribution the histogram tab can be used to perform ac testing or, more commonly, dc testing. this tab shows the adc code distribution of the input and computes the mean and standard deviation, which are displayed as dc offset/ mean and transition noise , respectively, in the histogram analysis area ( located toward the bottom of the window ). figure 23 shows the histogram with ac input for a 1 khz sine wave applied to the adc input and the resulting calculations. ac input to perform a histogram test of ac input, 1. apply a sinusoidal signal wi th low distortion (better than 100 db) to the evaluation board at the j6 or j1 4 input sma connector pair . 2. click the histogram tab from the main window. 3. click single capture or continuous capture . raw data is then captured and passed to the pc for statistic al computations, and various measured values are displayed in the histogram analysis area. dc input a histogram test of dc input can be performed with or without an external source because the evaluation board has a buffered v ref /2 source at the adc input . to perform a histogram test of dc input, 1. if an external source is being used, apply a sinusoidal signal with low distortion (better than 100 db) to the evaluation board at the j6 or j1 4 input sm a connector pair . it may be required to filter the signal to ensure that the dc source is noise - compatible with the adc. 2. click the histogram tab from the main window. 3. click single capture or continuous capture . raw data is then captured and passed to the pc for statistical computations, and various measured values are displayed in the histogram analysis area. figure 23 . histogram tab 11798-023
ug- 608 eval - ad7902sdz user guide rev. 0 | page 18 of 32 generating a fast fo urier transform of ac characteristics figure 24 shows the fft tab. this feature tests the traditional ac characteristics of the converter and displays a fast fourier transform (fft) of the results. to perform an ac fft test, 1. apply a sinu soidal signal with low distortion (better than 100 db) to the evaluation board at the j6 or j1 4 input sma connector pair . to attain the requisite low distortion, which is necessary to allow true evaluation of the part, one option is to a. filter the input si gnal from the ac source. a band - pass filter can be used; its center frequency must match the test frequency of interest. b. if a low frequency band - pass filter is used when the full - scale input range is more than a few volts peak - to - peak, use the on - board amp lifiers to amplify the signal, thus preventing the filter from distorting the input signal. 2. click the fft tab from the main window. 3. click sample . as in the histogram test, raw data is then captured and passed to the pc, which performs the fft and displays the resulting snr, sinad, thd, and sfdr . the fft analysis area displays th e results of the cap tured data. ? the area labeled 1 in figure 24 shows the spectrum information. ? the area labeled 2 in figure 24 displays the fundamental frequency and amplitude . you can also click show harmonic content to view information about the second to fifth harmonics. ? the area labeled 3 in figure 24 displays the performance data, including the snr, thd, sinad, and noise performance . figure 24 . fft tab 11798-024 1 2 3
eval - ad7902sdz user guide ug- 608 rev. 0 | page 19 of 32 generating a summary of the waveform, histogram, and fast fourier transform figure 25 shows the summary tab . the summary tab captures all the display information and provides it in one panel with a synopsis of the information, inclu ding key performance parameters , such as snr and thd. figure 25 . summary tab 11798-025
ug- 608 eval - ad7902sdz user guide rev. 0 | page 20 of 32 evaluation board sch ematics and artwork eval - ad7902sdz schematics figure 26 . schematic , p age 1 11798-026
eval - ad7902sdz user guide ug- 608 rev. 0 | page 21 of 32 figure 27 . schematic , p age 2 11798-027
ug- 608 eval - ad7902sdz user guide rev. 0 | page 22 of 32 figure 28 . schematic , p age 3 11798-028
eval - ad7902sdz user guide ug- 608 rev. 0 | page 23 of 32 figure 29 . schematic , p age 4 11798-029
ug- 608 eval - ad7902sdz user guide rev. 0 | page 24 of 32 figure 30 . schematic , p age 5 11798-030
eval - ad7902sdz user guide ug- 608 rev. 0 | page 25 of 32 figure 31 . schematic , p age 6 11798-031
ug- 608 eval - ad7902sdz user guide rev. 0 | page 26 of 32 eval - ad7902sdz layout layout considerations when laying out the printed circuit board (pcb) for the ad7902 , follow the recommended guidelines described in this section to obtain the maximum performance from the converter. figure 33 through figure 36 show the recommended layout for the ad7902 evaluation board. ? decouple all the power supply pins (vdd1, vdd2, and vio) and the ref pin with low esr and low esl ceramic capacitors, typically 10 f and 100 nf, placed close to the dut (u1) and conn ected using short, wide traces to provide low impedance paths and to reduce the effect of glitches on the power supply lines. ? separate analog and digital sections and keep power supply circuitry away from the ad7902 . ? avoid running digital lines under the device and crossover of digital and analog signals because these couple noise into the ad7902 . figure 32 . eval - ad7902sdz evaluation board silkscreen top assembly 11798-032
eval - ad7902sdz user guide ug- 608 rev. 0 | page 27 of 32 figure 33 . eval - ad7902sdz evaluation board top layer figure 34 . eva l - ad7902sdz evaluation board layer 2 ground 11798-033 11798-034
ug- 608 eval - ad7902sdz user guide rev. 0 | page 28 of 32 figure 35 . eval - ad7902sdz evaluation board layer 3 power figure 36 . eval - ad7902sdz evaluation board bottom layer 11798-035 11798-036
eval - ad7902sdz user guide ug- 608 rev. 0 | page 29 of 32 bill of materials table 4 . eval - ad7902sdz bill of materials reference designator part description manufacturer part number stock code u1 dual pseudo differential 16- bit , 1 msps pulsar adc analog de vices ad7902 ad7902 u2 1.2 a, 20 v, 1.4 mhz nonsynchronous step - down switching regulator analog devices adp2301aujz adp2301aujz -r7 u3 1.2 a, 20 v, 1.4 mhz nonsynchronous step - down switching regulator analog devices adp2301aujz adp2301aujz -r7 u4 linear regulator , 3.3 v, 20 v, 500 ma, u ltralow noise , cmos analog devices adp7104ardz - 3.3 adp7104ardz - 3.3 -r7 u5 2.7 v, 800 a, 80 m h z rail -to - rail i/o single amplifier sot23 -5 analog devices ad8031artz ad8031artz -r2 u6 ultralow noi se xfet voltage references analog devices adr435brz adr435brz u7 linear regulator, 2.5 v, 20 v, 500 ma, ultralow noise , cmos analog devices adp7104ardz - 2.5 adp7104ardz - 2.5 -r7 u8 single inv fairchild nc7sz04m5 farnell 1013809 u9 single and gate fairchild nc7sz085m5 farnell 1013807 u10 single and gate fairchild nc7sz085m5 farnell 1013807 u11 single and gate fairchild nc7sz085m5 farnell 1013807 u12 low noise, high speed amplifier for 16 - bit systems analog devices ada4841 - 1yrz ada4841 - 1yrz - r7 u13 20 v, 500 ma, low noise , cmos adju stable ldo analog devices adp7104ardz adp7104ardz - r7 u14 not applicable not applicable not applicable do not place u15 32k i 2 c serial eeprom, 8 - lead msop microchip 24lc32a - i/ms farnell 1331330 u16 not applicable not applicable not applicable do not place u17 low noise, high speed amplifier for 16 - bit systems analog devices ada4841 - 1yrz ada4841 - 1yrz-r7 c1, c2, c5, c9, c11, c13, c19 capacitor tantalum , 20 v avx tajb106k020rnj farnell 197427 c3, c4, c6, c7 capacitor ceramic , 4.7 f, 16 v, x7r, 0805 taiyo yuden emk212b7475kg -t farnell 1853520 c8, c20, c23, c25, c27, c28, c30, c31, c34, c37, c41, c42, c44, c53, c54, c56, c57, c59, c77, c78 capacitor ceramic , 50 v , x7r murata grm188r71h104ka93d farnell 8820023 c9 capacitor ceramic , 50 v, x7r , 0805 murata c0805c104k5ractu farnell 1414664 c12, c40, c79 capacitor ceramic , 22 f, 10 v, x7r, 1206 avx lmk316ab7226ml -tr farnell 1894515 c14 capacitor ceramic , 4.7 f, 16 v, x5r, 1206 taiyo yuden emk316bj475kl -t farnell 6578937 c15, c16, c17, c21, c22, c26 capacitor , 0805, 1 f, 50 v, x7r murata grm21br71h105ka12l farnell 1735541 c18 capacitor ceramic , 50 v , x7r murata grm188r71h103ka01d farnell 1118178 c33, c58 capacitor ceramic , 10 p f, 100 v, c0g, 0603 avx 06031a100jat2a farnell 1273324 c35, c74 capacitor ceramic , 2700 p f, 50 v, c0g/np0, 0603 tdk c1608c0g1h272j farnell 1844178
ug- 608 eval - ad7902sdz user guide rev. 0 | page 30 of 32 reference designator part description manufacturer part number stock code c24, c29, c32, c36, c38, c39, c43, c45, c46, c47, c48 , c49, c50, c51, c52, c55, c60, c61, c62, c63, c65, c66 , c67, c68, c69, c70, c71, c72, c73, c75 , c76, c80 , c81 not applicable not applicable not applicable do not place r1 resistor , thick film , 2.4 k , 0603, 100 mw, 1% yageo rc0603fr - 072k4l farnell 1799329 r2 smd resistor multicomp mc 0.1w 0805 1% 62k farnell 9333436 r3 resistor , 0603 , 35. 7 k multicomp mc 0.063w 0603 1% 35k7 farnell 1170942 r4 smd resistor multicomp mc 0.0625w 0402 1% 53k6 farnell 1803723 r5 smd resistor multicomp mc 0.0625w 0402 1% 10k2 farnell 1803137 r6 resistor , 0603 , 16. 9 k multicomp mc 0.063w 0603 1% 16k9 farnell 1170908 r7 resistor , 0805, 12.1 k, 1% vishay draloric crcw080512k1fkea farnell 1469866 r10 resistor , 0603 , 82 k , 0.063 w, 1% multicomp mc 0.063w 0603 1% 82k farnell 9331573 r11 , r13, r42, r44 smd resistor multicomp mc 0.063w 0603 1% 100k farnell 9330402 r12, r15 resistor, 20 k , 0.063 w, 1%, 0603 multicomp mc 0063w 0603 1 20k farnell 9330771 r14, r20, r21, r23, r25, r26, r36, r45, r48, r53, r63, r69, r70, r71, r72 smd resistor multicomp mc 0.063w 0603 0r farnell 9331662 r17, r22, r46, r47 resistor , 0805, 49 . 9 , 0.1%, 0.125 w panasonic era6aeb49r9v farnell 1810805 r2 8, r35, r50, r74 resistor, 2 k , 0.1 w, 1%, 0805 multicomp mc 01w 0805 1 2k farnell 9332766 r27, r34, r49, r73 resistor, 100 k , 0.1 w, 1%, 0805 multicomp mc 01w 0805 1 100k farnell 9332405 r24, r67 resistor , 22 , 1% 0805 vishay draloric crcw080522rofkeahp farnell 1738936 r8, r9, r16, r18, r19, r29, r30, r31, r32, r33 , r37, r38, r39, r40, r41, r44, r54, r55, r56, r59, r60, r61, r62, r64, r65, r66 , r68 not applicable not applicable not applicable do not place
eval - ad7902sdz user guide ug- 608 rev. 0 | page 31 of 32 related links resource description ad7902 product page: dual pseudo dif ferential 16 - bit, 1 msps pulsar adc ada48 41 -1 product page : unity gain stable, low noise and distortion, rail -to - rail output amplifier ad8031 product page : 2.7 v, 800 a, 80 mhz rail -to - rail i/o amplifiers adp7104 product page : 20 v, 300 ma /500 ma, low noise, cmos ldo adp2301 product page : 1.2 a, 20 v, 1.4 mhz, nonsynchronous step - down regulator adr 435 product page : ultralow noise, high accuracy voltage references
ug- 608 eval - ad7902sdz user guide rev. 0 | page 32 of 32 notes esd caution esd (electrostatic discharge) sensitive device . charged devices and circuit boards can discharge without detection. although this product features patented or proprietary pr otection circuitry, damage may occur on devices subjected to high energy esd. therefore, proper esd precautions should be taken to avoid performance degradation or loss of functionality. legal terms and conditions by using the evaluation board discussed herein (together with any tools, components documentation or support materials, the evaluation board), you are agreeing to be bound by the terms and conditions set forth below (agreement) unless you have purchase d the evaluation board, in which case the analog devices standard terms and conditions of sale shall govern. do not use the e valuation board until you have read and agreed to the agreement. your use of the evaluation board shall signify your acceptance of the agreement. this agreement is made by and between you (customer) and analog devices, inc. (adi), with its principal place of business at one technology way, norwood, ma 02062, usa. subject to the terms and conditi ons of the agreement, adi hereby gra nts to customer a free, limited, personal, temporary, non - exclusive, non - sublicensable, non - transferable license to use the evaluation board for evaluation purposes only. customer understands and agrees that the evalu ation board is provided for the sole an d exclusive purpose referenced above, and agrees not to use the evaluation board for any other purpose. furthermore, the lice nse granted is expressly made subject to the following additional limitations: customer shall not (i) rent, lease, display, sell, t ransfer, assign, sublicense, or distribute the evaluation board; and (ii) permit any third party to access the evaluation boa rd. as used herein, the term third party includes any entity other than adi, customer, their employees, affiliates and in - house c onsultants. the evaluation board is not sold to customer; all rights not expressly granted herein, including ownership of the evaluation board, are reserved by adi. confidentiality. this agreement and the evaluation board shall all be considered the confid ential and proprietary information of adi. customer may not disclose or transfer any portion of the evaluation board to any other party for any reason. upon discontinuation of use o f the evaluation board or termination of this agreement, customer agrees to promptly return the evaluation board to adi. additional restrictions. customer may not disassemble, decompile or reverse engi neer chips on the evaluation board. customer shall inform adi of any occurred damages or any modifications or alterations it makes to the evaluation board, including but not limited to soldering or any other activity that affects the material content of th e evaluation board. modifications to the evaluation board must comply with applicable law, including but not limited to the rohs d irective. termination. adi may terminate this agreement at any time upon giving written notice to customer. customer agrees to return to adi the evaluation board at that time. limitation of liability. the evaluation boar d provided hereunder is provided as is and adi makes no warranties or representations of any kind with respect to it. adi specifically disclaims any representations, endorsements, g uarantees, or warranties, express or implied, related to the evaluation board including, but not limited to, the implied warranty of merchantability, title, fitness for a particular purpose or noninfringement of intellectual property rights. in no event will adi and its licensors be liable for any incidental, special, indirect, or consequential dam ages resulting from customers possession or use of the evaluation board, including but not limited to lost profits, delay costs, labor costs or loss of goodwill. adis total li ability from any and all causes shall be limited to the amount of one hundred us dollars ($100 .00). export. customer agrees that it will not directly or indirectly export the evaluation board to another country, and tha t it will comply with all applicable united states federal laws and regulations relating to exports. governing law. this agreement shall be governed by and construed in accordance with the substantive laws of the commonwealth of massachusetts (excluding conflict of law rules). any legal action regarding this agreement will be heard in the state or fede ral courts having jurisdiction in suffolk county, massachusetts, and customer hereby submits to the personal jurisdiction and venue of such courts. the united nations convention on contracts for the internation al sale of goods shall not apply to this agreement and is expressly disclaimed. ? 2014 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. ug11798 - 0 - 2/14(0)

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