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eval - ad7903sdz user guide ug - 609 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 ad7903 dua l 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 ad7903 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 frequency domain evaluatio n kit contents eval - ad7903 sdz evaluation board wall power supply 9 v dc adapter daughter card power connector additional equipment / software needed system 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 ad7903 (download from ad7903 product page) online resources documents needed ad7903 data sheet eval - ad7903sdz user guide required software eval - ad7903sdz evaluation software faqs and troubleshooting typical setup figure 1. typical setup for the eval - ad7903sdz ( eval - ad7903sdz on left and eval - sdp - cb1z on right) signa l source sma connec t or pc 1 1800-001
ug-609 eval-ad7903sdz 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 description ......................................................................... 3 ? getting started .................................................................................. 4 ? software installation procedures ................................................ 4 ? evaluation board setup procedures ........................................... 7 ? evaluation board hardware ............................................................ 8 ? device description ....................................................................... 8 ? power supplies .............................................................................. 8 ? link configuration options ......................................................... 10 ? evaluation board circuitry ........................................................... 11 ? analog inputs .............................................................................. 11 ? reference ..................................................................................... 11 ? serial interface ............................................................................ 11 ? modes of operation ....................................................................... 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 ? eval-ad7903sdz schematics ............................................... 20 ? eval-ad7903sdz layout ....................................................... 25 ? bill of materials ............................................................................... 28 ? related links ................................................................................... 30 ? revision history 1/14revision 0: initial version
eval - ad7903sdz user guide ug- 609 rev. 0 | page 3 of 32 general description the e va l - ad7903sdz is an evaluation board designed to demonstrate the low powe r ad7903 performance and to provide an easy to understand interface for a variety of system applications. the ad7903 is a dual differential 16 - bit, 1 msps pulsar? adc. a full description of the ad7903 is available in the ad7903 data sheet a nd 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, e va l - sdp - cb 1z . the evaluation board interfaces to the sdp board via a 120 - pin connector. sma connectors j6, j7, j10, and j15 are provided to connect a low noise analog signal source. the user pc software executable controls the evaluation board over the usb through the sdp board, e va l - sdp - cb1z . on - board components include the following: adr 435: high precision, buffered band gap 5.0 v reference ad8031 : reference buffer ada48 41- 1 : signal conditioning circuit with op amps adp7104 and adp2301 : regulators to deri ve necessary voltage levels on board
ug- 609 eval - ad7903sdz user guide rev. 0 | page 4 of 32 getting started software installatio n procedures the evaluation board software can be downloaded from the ad7903 product page on the analog devices website, at www.analog.com . there are two parts to the installation: ? ad7903 evaluation board software installation ? e va l - sdp - cb1z system demonstration platform board drivers installation warning the evaluation board software and drivers must be installed before connecting the evaluation board and e va l - sdp - cb1z board to the usb port of the pc to ensure that the evaluation system is correctly recognized when it is connected to the pc. installing the ad7903 evaluation board software to install the ad7903 evaluation board software, 1. start the windows operating system and download the software from the ad7903 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. ad7903 evaluation board software installation: installation begins 4. select the locat ion to install the software, and then click next . (the default location is c: \ program files (x 86 ) \ analog devices \ ad7902_03 evaluation software \ . this location also contains the executable software and example files.) figure 3. ad7903 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 s elect i accept the license agreement and click next . figure 4. ad7903 evaluation board software installation: accepting the license agreement 11800-002 11800-003 11800-004
eval - ad7903sdz user guide ug- 609 rev. 0 | page 5 of 32 6. a summary of the installation is displayed. click next to continue. figure 5. ad7903 evaluation board software installation: reviewing a summary of the installa tion 7. a dialog box shows the installation progress. figure 6. ad7903 evaluation board software installation: displaying installation progress 8. the dialog box info rms you when the installation is complete. click next . figure 7. ad7903 evaluation board software installation: indicating when the installation is complete 9. the setup for the installation of the e va l - sdp - cb1z system demonstration platform board drivers auto - matically begins to load. figure 8. loading the setup for sdp drivers installation installing the eval - sdp - cb1z system demonstration platform board drivers after the installation of the evaluation board software is complete, a welcome window is displayed for the installation of the e va l - 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 11800-005 11800-006 11800-007 11800 -008 11800-009
ug- 609 eval - ad7903sdz 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 drivers setup: beginning the installation 4. a dialog box appears asking whether you would like to install this device software. click inst all to confirm that you would like to install the drivers. figure 12 . eval - sdp - cb1z drivers setup: granting permission to in stall 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. fi gure 14 . eval - sdp - cb1z drivers setup: restarting the computer 11800-010 11800-011 11800 -012 11800-013 11800-014
eval - ad7903sdz user guide ug- 609 rev. 0 | page 7 of 32 evaluation board set up procedures the ad7903 evaluation board connects to the ( e va l - sdp - cb1z ) system demonstration board. the e va l - sdp - cb1z board is the controller board, 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 - ad7903sdz daughter board and the e va l - sdp - cb1z motherboard. connecting the evaluation and sdp boards to a pc 1. install the ad7903 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 - ad7903sdz board to connector j4 on the e va l - sdp - cb1z board. nylon screws are included in the e va l - ad7903sdz evaluation kit and can be used to ensure that the e va l - ad7903sdz 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 are 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 automatically search for the drivers for the e va l - sdp - cb1z board if prompted by the operating s ystem.) 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 11800-015
ug- 609 eval - ad7903sdz user guide rev. 0 | page 8 of 32 evaluation board har dware device description the ad7903 is a 16- bit , 1 msps , precision, power efficient, dual differential pulsar adc that uses sar - based architecture and does not exhibit any pipeline delay or latency. the ad7903 is specified for use with a single supply of 2.5 v (vdd1, vdd2). the interface from the digital host to the ad7903 uses 1.8 v / 2.5 v/3.3 v/5.5 v logic. the ad7903 is compatible with the spi/qspi/microwire/dsp serial interface to transfer data conve rsions. complete ad7903 specifications are provided in the ad7903 data sheet and should be consulted in conjunction with 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 ad7903 adc ( u1 ) with a reference ( u6 adr 435) , and several adc drivers ( u12, u14 , u16 , 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 bench top power supply. by default, the board i s 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 - ad7903sdz user guide ug- 609 rev. 0 | page 9 of 32 figure 16 . simplified evaluation board functional block diagram sdp board 11800-016 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- 609 eval - ad7903sdz user 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 default posi tion column 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 a analog input do not alter . sl6 a analog input do not alter . 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 a u12 output connects to u14 input change to b if u14 inverting input needs to be connect ed to ground. lk7 a u17 output connects to u16 input change to b if u16 inverting input needs to be connect ed to ground. lk8 a adc2 input change to b if using adc1 input. 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 u16 input change to b if u16 needs to be bypassed.
eval - ad7903sdz user guide ug- 609 rev. 0 | page 11 of 32 evaluation board cir cuitry analog inputs the analog inputs to the evaluation board are sma connectors j6 , j7 , j10 , and j15. these inputs are buffered with dedicated amplifier circuitry ( u12, u14, u16 , 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, u14, u16 , and u17 ) at midscale, generated from a buffered reference voltage divider (vcm). the evaluation board is configured by factory default for providing a 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 for a balanced and floating ground. 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 49.9 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 referen ce (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- 609 eval - ad7903sdz user guide rev. 0 | page 12 of 32 modes of operation sdp controlled mode the ad7903 uses a high speed serial interface that allows sampling rates of up to 1 msps. for more information about the operation of the serial interface, refer to the ad7903 data sheet. the ad7903 uses the serial interface to transfer data to the e va l - sdp - cb1z . the e va l - ad7903sdz communicates with the e va l - sdp - cb1z board using level shifters. the eva l - sdp - cb1z operates at a 3.3 v logic level, which allows logic voltages that exceed 3.3 v to be used without damaging the sdp interface. standalone mode the e va l - ad7903sdz can also be used without the e va l - sdp - cb1z controller board . in this case, the e va l - ad7903sdz i s 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 ad7903 data sheet.
eval - ad7903sdz user guide ug- 609 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 evaluation board with 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 app ropriate supply , as described in the power supplies section. 3. connect the ev al - sdp - cb1z board to a pc using the usb cable. 4. start the evaluation software. click start > all programs > ad7903 _03_evaluation > ad7903 _03_evaluation_ software . 5. apply a signal source and capture data. starting the software when the software starts running, it searches for hardware connected 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 conne cted to run the program with hardware connected , 1. click start > all programs > ad7903 _03_evaluation > ad7903 _03_evaluation_software . ( to uninstall the program, click start > control panel > add or remove programs > ad7903 _03_evaluation .) 2. if the sdp board is not connected to the usb port when the software is launched, a connectivity 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 seconds, 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 - ad7903sdz board is connected. without hardware connected the software can run in standa lone mode when no evaluation board hardware is connected to the usb port. 1. click start > all programs > ad7903 _03_evaluation > ad7903 _03_evaluation_software . 2. the software automatically seeks to find the hardware connected; therefore, when no hardware 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 1 1800-017 1 1800-018 1 1800-019 1 1800-020
ug- 609 eval - ad7903sdz 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 decide to connect hardware at this point, you mu st close the software and relaunch it to allow it to search for the board again. figure 21 . main window 1 1800-021
eval - ad7903sdz user guide ug- 609 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 connected to the usb port either e va l - ad7902sdz or e va l - ad7903sdz . 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 section allows changing the sampling frequency and the reference voltage value, as w ell 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/maximum voltage calculations a re 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 ) wi thin the graphs displayed. each tab is described in more detail in the generating a waveform analysis report ; ge nerating 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 secti ons. single capture button click ing single 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 numb er 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- 609 eval - ad7903sdz user guide rev. 0 | page 16 of 32 generating a waveform analysis report figure 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 are a (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 1 1800-022 control cursor control panning control zooming
eval - ad7903sdz user guide ug- 609 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 te st of ac input, 1. apply a differential sinusoidal signal with low distortion (better than 100 db) to the evaluation board at the j6 / j7 or j10 / j15 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 statistical 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 becau se 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 differential sinusoidal signal with low distortion (better than 100 db) to the evaluation board at the j6 / j7 or j10 / j15 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 1 1800-023
ug- 609 eval - ad7903sdz 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 con verter and displays a fast fourier transform (fft) of the results. to perform an ac fft test, 1. apply a differential sinusoidal signal with low distortion (better than 100 db) to the evaluation board at the j6 / j7 or j10 / j15 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 signal 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 amplifiers to amplify the signal, thus preventing the filter from distorting the input signal. 2. click the fft tab from the m ain 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 lab eled 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, dynamic range, thd, sinad, and noise performance . figure 24 . fft tab 1 1800-024 1 2 3
eval - ad7903sdz user guide ug- 609 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 1 1800-025
ug- 609 eval - ad7903sdz user guide rev. 0 | page 20 of 32 evaluation board sch ematics and artwork eval - ad7903sdz schematics figure 26 . schematic , p age 1 figure 27 . schematic , p age 2 1 1800-026 1 1800-027
eval - ad7903sdz user guide ug- 609 rev. 0 | page 21 of 32 figure 28 . schematic , p age 3 1 1800-028
ug- 609 eval - ad7903sdz user guide rev. 0 | page 22 of 32 figure 29 . schematic , p age 4 1 1800-029
eval - ad7903sdz user guide ug- 609 rev. 0 | page 23 of 32 figure 30 . schematic , p age 5 1 1800-030
ug- 609 eval - ad7903sdz user guide rev. 0 | page 24 of 32 figure 31 . schematic , p age 6 1 1800-031
eval - ad7903sdz user guide ug- 609 rev. 0 | page 25 of 32 eval - ad7903sdz layout layout considerations when laying out the printed circuit board (pcb) for the ad7903 , 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 ad7903 evaluation board. ? decouple all the power supply pins (vdd1, vdd2, and vio) and t he ref pin with low esr and low esl ceramic capacitors, typically 10 f and 100 nf, placed close to the dut (u1) and connected 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 ad7903 . ? avoid running digital lines under the device and crossover of digital and analog signals because these couple noise into the ad7903 . figure 32 . eval - ad7903sdz evaluation board silkscreen top assembly 1 1800-032
ug- 609 eval - ad7903sdz user guide rev. 0 | page 26 of 32 figure 33 . eval - ad7903sdz evaluation board top layer figure 34 . eval - ad7903sdz evaluation board layer 2 ground 1 1800-033 1 1800-034
eval - ad7903sdz user guide ug- 609 rev. 0 | page 27 of 32 figure 35 . eval - ad7903sdz evaluation board layer 3 power figure 36 . eval - ad7903sdz evaluation board bottom layer 1 1800-035 1 1800-036
ug- 609 eval - ad7903sdz user guide rev. 0 | page 28 of 32 bill of materials table 4 . eval - ad7903sdz bill of materials reference designator part description manufacturer part number stock code u1 dual differential 16- bit , 1 msps pulsar? adc analog devices ad7903 ad7903 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, ultralow 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 noise 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 adjustable ldo analog devices adp7104ardz adp7104ardz - r7 u14 low noise, high speed amplifier for 16 - bit systems analog devices ada4841 - 1yrz ada4841 - 1yrz-r7 u15 32k i 2 c serial eeprom, 8 - lead msop microchip 24lc32a - i/ms farnell 1331330 u16 low noise, high speed amplifier for 16 - bit systems analog devices ada4841 - 1yrz ada4841 - 1yrz-r7 u17 low noise, high sp eed 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, c45, c48, c53, c54, c56, c57, c59, c65, c67, c77, c78, c80 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, c50, c58, c66 capacitor ceramic , 10 p f, 100 v, c0g, 0603 avx 06031a100jat2a farnell 1273324 c35, c52, c74, c75 capacitor ceramic , 2700 p f, 50 v, c0g/np0, 0603 tdk c1608c0g1h272j farnell 1844178
eval - ad7903sdz user guide ug- 609 rev. 0 | page 29 of 32 reference designator part description manufacturer part number stock code c 24, c29, c32, c36, c38, c39, c43, c46, c47, c49, c55, c60, c61, c62, c63, c68, c69, c70, c71, c 72, c73, c76, c81 capacitor ceramic , 50 v, c0g/np0, 0603 tdk c1608c0g1h272j 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, r14, r20, r21, r23, r25, r26, r36, r 38, r40, r45, r48, r53, r56, r63, r64, r69, r70, r71, r72 smd resistor multicomp mc 0.063w 0603 0r farnell 9331662 r17, r22, r32, r37, r46, r47, r54, r55 resistor , 0805, 49 . 9 , 0.1%, 0.125 w panasonic era6aeb49r9v farnell 1810805 r27, r28, r34, r35, r49, r50, r73, r74 resistor, 0805, 49.9 k, 1%, 0.125 w panasonic erj - 6enf4992v digi - key p49.9kcct -nd r24, r41, r67, r68 resistor , 22 , 1% 0805 vishay draloric CRCW080522ROFKEAHP farnell 1738936 r8, r9, r15, r16, r18, r19, r29, r30, r31, r33, r39, r44, r59, r60, r61, r62, r65, r66 not applicable not applicable not applicable do not place
ug- 609 eval - ad7903sdz user guide rev. 0 | page 30 of 32 related links resource description ad7903 product page: dual 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
eval - ad7903sdz user guide ug- 609 rev. 0 | page 31 of 3 2 notes
ug-609 eval-ad7903sdz user guide rev. 0 | page 32 of 32 notes esd caution esd (electrostatic discharge) sensitive device . charged devices and circuit boards can discharge without detectio n. 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 an y tools, components documentation or support materials, the ev aluation board), you are agreeing to be bound by the terms and conditions set forth below (agreement) unless you have purchased the evalua tion board, in which case the analog devices standard terms a nd conditions of sale shall govern. do not use the evaluation board until you have read and agreed to the agreement. your use of the evaluation board shall signify your acceptance of the agreement. this ag reement 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 condition s of the agreement, adi hereby grants 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 evaluation board is provided for the sole and exclusive purpose referenced above, and agrees not to use the evaluation board for any other purpose. furthermore, the license granted is expressly made subject to the following additional limitations: customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the evaluation boar d; and (ii) permit any third party to access the evaluation board. as used herein, the term third party includes any entity other than adi, customer, th eir employees, affiliates and in-house consultants. the evaluatio n board is not sold to customer; all righ ts not expressly granted herein, including ownership of the evaluation board, are reserved by adi. confiden tiality. this agreement and the evaluation board shall all be c onsidered the confidential 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 of the evaluation board or termination of this agreement, customer agrees to promptly return the evaluation board to adi. additional restri ctions. customer may not disassemble, decompile or reverse engine er 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 o r any other activity that affects the material content of the evaluation board. modifications to the evaluation board must comply with applicable law, including but not limited to the rohs directive. termina tion. 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 board provided hereunder is provided as is and adi makes no warranties or representations of any kind with respect to it. adi specifically disclaims any re presentations, endorsements, gua rantees, or warranties, express or implied, related to the evaluation board including, but not limited to, the implie d 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 damag es 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 liab ility 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 evaluati on board to another country, and that it will comply with all applicable united states federal laws and regulations relating to exports. governing law. this agreement shall be governed by and construe d 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 federa l 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 international 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 prop erty of their respective owners. ug11800-0-1/14(0)

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