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Evaluation Board 2.7V 5.25V, Micro Power, 2-Channel, kSPS, 12-Bit EVAL-AD7887CB
BOARD which also available from Analog Devices. External sockets provided AIN0 AIN1 inputs.
OPERATING AD7887 EVALUATION BOARD Power Supplies
Full-Featured Evaluation Board AD7887 EVAL-CONTROL BOARD Compatible Stand Alone Capability On-Board Analog Buffering Reference Optional On-Board Biasing/Filter Circuit Various Linking Options Software Control Data Analysis when used with EVAL-CONTROL BOARD INTRODUCTION
When using this evaluation board with EVAL-CONTROL BOARD supplies provided from EVALCONTROL BOARD through connector. When using board stand alone unit external supplies must provided. This evaluation board seven power supply inputs: VDD, AGND, +12V, -12V, AGND, DVDD DGND. +5V/+3V must connected input supply AD7887 pin. +12V -12V used supply OP467 quad op-amp AD780 voltage reference. connected both AGND inputs. DVDD input used supply separate 74LS04 DGND input must tied Alternatively 74LS04 supplied from same AD7887 supply inserting LK15 supplies decoupled relevant ground plane with 10µF tantalum 0.1µF multilayer ceramic capacitors point where they enter board. supply pins AD7887, quad op-amp reference also decoupled AGND with 10µF tantalum 0.1µF ceramic capacitor. Extensive ground planes used this board minimize effect high frequency noise interference. There ground planes, AGND DGND. These connected location close AD7887 pin.
This Technical Note describes evaluation board AD7887, high speed, power, 12-bit that operates from single 5.25 power supply. AD7887 capable ksps throughput rate. input track-andhold acquires signal features single ended sampling scheme. output coding AD7887 straight binary part capable converting full power signals 2.5MHz. Full data AD7887 available AD7887 data sheet available from Analog Devices should consulted conjunction with this Technical Note when using Evaluation Board. On-board components include AD780 which programmable +2.5V ultra high precision bandgap reference, OP467 quad op-amp 74LS04 inverting buffer. There various link options which explained detail page Interfacing this board through 96-way connector. This 96-way connector compatible with EVAL-CONTROL
FUNCTIONAL BLOCK DIAGRAM
ilte SCLK ilte
oltag
ternal
ilter ni-p
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Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices.
Technology Way, P.O. 9106, Norwood. 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
EVAL-AD7887CB
LINK SWITCH OPTIONS
There nine link options which must required operating setup before using evaluation board. functions these options outlined below.
Link Function.
This link option used connect input AIN0 analog buffer AIN0 input socket Agnd. When this link position AIN0 socket tied input AIN0 buffer. this configuration, analog signal applied AIN0 input socket buffered presented AD7887 AIN0 input. When this link position AIN0 buffer input tied Agnd. This link option used connect input AIN1 analog buffer AIN1 input socket Agnd. When this link position AIN1 socket tied input AIN1 buffer. this configuration, analog signal applied AIN1 input socket buffered presented AD7887 AIN1 input placing position "A". AD7887 must cofigured dual input channel operation before using AIN1 input. When this link position AIN1 buffer input tied Agnd. This link option used select source input signal that applied AIN1/VREF pin. When this link position output AIN1 input buffer tied AIN1/VREF pin. AD7887 must configured dual channel operation before using this option. also needs placed position dual channel operation. When this link position AD780 provides reference voltage ADC. AD7887 must configured single channel operation before using this option. When this link position exteranl reference voltage supplied VREF connector. AD7887 must configured single channel operation before using this option. Placing this link position selects reference voltage ADC. AD7887 must configured single channel operation before using this option. Removing this link option causes internal reference reference voltage. Once again AD7887 must configured single channel operation before using this option. This link option controls program AD780 voltage reference. When this link "inserted" AD780 output voltage +3.0V. When this link "removed" AD780 output voltage +2.5V. This link option sets bias voltage that applied optional bias-up/filter circuit. When this link position "A", bias voltage same level voltage that applied VREF pin. this configuration bipolar analog input applied socket passed through lo-pass filter circuit presented thet Vbiased uni-polar signal biased around Vref/2. When this link option placed position "B", bias voltage VDD. this configuration bipolar analog input applied socket passed through lo-pass filter circuit presented thet Vbiased uni-polar signal biased around Vdd/2. This option must selected dual channel operation required. When this link removed, selected bias voltage. this configuration optional bias-up/ filter circuit acts pass filter only. This link option used select source +12V supply position +12V supplied from EVAL-CONTROL BOARD through connector. position +12V supplied from external source through power connector, This link option used select source -12V supply. position -12V supplied from EVAL-CONTROL BOARD through connector. position -12V supplied from external source through power connector, This link selects source supply AD7887. from EVAL-CONTROL BOARD. When this link position must supplied from external source When this link position supplied from EVAL-CONTROL BOARD This link selects source DVDD supply 74LS04 digital buffers. When this link position "A", DVDD power supplied from same power source supplying AD7887 pin. When this link position "B", DVDD power must supplied from external source power connector,
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EVAL-AD7887CB
SETUP CONDITIONS
Care should taken before applying power signals evaluation board ensure that link positions required operating mode. Table shows position which links when evaluation board sent out.
Table Initial Link Switch Positions
Link
Position Removed
Function. AIN0 connected input AIN0 analog buffer. input AIN1 analog buffer tied AGND. AD780 reference voltage applied AD7887 AIN1/VREF pin. AD780 provide +2.5V reference. VREF selected bias voltage optional bias-up/filter circuit. +12V supplied from EVAL-CONTROL BOARD -12V supplied from EVAL-CONTROL BOARD AD7887 supplied EVAL-CONTROL BOARD 74LS04 powered from same power source AD7887.
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EVAL-AD7887CB
EVALUATION BOARD INTERFACING Table 96-Way Connector Functions. ROWA ROWB ROWC
Interfacing evaluation board 96-way connector, used connect evaluation board EVALCONTROL BOARD other system. pinout connector shown Figure designations given Table
AVDD AVDD AVDD AGND -12V DGND AGND AGND AGND AGND AGND AGND DGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND +12V DGND AGND AGND AGND AGND AGND AGND DGND DGND DGND DGND DGND DGND DGND TFS0 DGND DGND RFS0 SCLK0
Figure Configuration 96-Way Connector,
96-Way Connector Description
Data Transmit Zero. This output connected AD7887. Data Receive Zero. This input connected DOUT AD7887 inverting buffers. Serial Clock Zero. This serial clock connected SCLK AD7887 inverting buffer. Transmit/Receive Frame Sync Zero. These outputs connected AD7887. Digital Ground. These pins connected digital ground plane evaluation board. allows user provide digital supply connector along with other digital signals. Analog Ground. These pins connected analog ground plane evaluation board. Analog Supply. These pins connected AD7887 LK12. +12V Supply. This connected supply line board LK13. -12V Supply. This line connected supply line board LK14.
SCLK0
TFSO/RFS0
DGND
AGND
AVDD
+12V -12V
Note unused pins 96-way connector shown.
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EVAL-AD7887CB
SOCKETS OPERATING WITH EVAL-CONTROL BOARD
There nine input sockets relevant operation AD7887 this evaluation board. function these sockets outlined Table III.
Table III. Socket Functions
Socket
Function Sub-Miniature Socket AIN0 channel. Sub-Miniature Socket AIN1 channel. Sub-Miniature Socket external reference voltage input. Sub-Miniature Socket Analog input bias-up circuit. Sub-Miniature Socket Analog output from bias-up circuit.
evaluation board operated stand-alone mode operated conjunction with EVAL-CONTROL BOARD. This EVAL-CONTROL BOARD available from Analog Devices under order entry "EVAL-CONTROL BOARD". When operated with this control board, supplies control signals operate AD7887 provided EVAL-CONTROL BOARD when under control AD7887 software which provided with AD7887 evaluation board package. This EVAL-CONTROL BOARD will also operate with Analog Devices evaluation boards which with letters their title. 96-way connector EVAL-AD7887CB plugs directly into 96-way connector EVAL-CONTROL BOARD. power supplies required system. EVAL-CONTROL BOARD generates required supplies itself EVAL-AD7887CB. EVAL-CONTROL BOARD powered from transformer. This standard transformer capable supplying current available accessory from Analog Devices under following part numbers: EVAL-110VAC-US: EVAL-220VAC-UK: EVAL-220VAC-EU: U.S. Japan U.K. Europe
CONNECTORS
There four connectors AD7887 evaluation board outlined Table
Table Connector Functions
These transformers also available other suppliers including Digikey (U.S.) Campbell Collins (U.K.). Connection between EVAL-CONTROL BOARD serial port standard RS-232 cable which provided part EVAL-CONTROL BOARD package. Please refer manual which accompanies EVAL-CONTROL BOARD more details EVALCONTROL BOARD package.
Connector
Function 96-Way Connector used interface EVALCONTROL BOARD External AGND power connector. External +12V, -12V AGND power connector. External DVDD DGND power connector.
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EVAL-AD7887CB
Figure Main Screen
SOFTWARE DESCRIPTION
Included EVAL-AD7887CB evaluation board package PC-compatible disk which contains software controlling evaluating performance AD7887 when operated with EVAL-CONTROL BOARD. EVAL-AD7887CB Demonstration/Evaluation Software runs under later requires minimum 386-based machine with 400kB base 500kB free hard disk space. user interface dedicated program written especially AD7887. disk which accompanies EVAL-AD7887CB contains several files. user should create directory main drive label this "AD7887". Then, files EVAL-AD7887CB disk should copied into this directory. Mouse Driver should enabled before running software. this been loaded, program will run. software, simply make AD7887 directory current directory type "go". When evaluation program starts, user sees screen shown Figure (without scope waveforms). This main screen divided into three parts. part provides main control interface AD7887 evaluation software. middle part main screen functions Digital Storage Oscilloscope bottom part main screen operates either Digital Spectrum Analyzer Histogram analyzer. Each part screen several buttons that pressed using mouse keyboard. press button using mouse, simply move on-screen pointer button activated click. keyboard, simply press appropriate highlighted button. Lower
case letters must used. When button pressed, highlighted screen. next button highlighted using previous button holding down shift together. highlighted button also pressed pressing space bar. Pressing halts operation currently progress. this document, button activated from keyboard then used shown bold button name. example, prog" highlighted bold, indicating that button activated pressing key. Some buttons have indicator. indicator button means that function associated with that button Absence indicator light means that function associated with button off. on/off status these buttons changed simply selecting button.
Setting EVAL-CONTROL BOARD
When software run, Setup" button left screen should selected setup menu (see fig. This menu sets EVAL-CONTROL BOARD with EVAL-AD7887CB. Firstly, configuration file must loaded. configuration file contains default configuration information EVAL-CONTROL BOARD, Digital Spectrum Analyzer Digital Storage Oscilloscope. also tells AD7887.EXE software which .HIP file download ADSP-2111. .HIP file contains code which executed ADSP-2111. Normally, prog" button off, when configuration file loaded, .HIP file automatically downloaded ADSP-2111. However, prog" button then .HIP file downloaded ADSP-2111. REV.
EVAL-AD7887CB
load configuration file, click "load" button screen. After configuration file loaded, sample rate number samples changed. nature interface, depending selected mode operation care must taken when choosing sample frequencies. There four operating modes available AD7887. default operating mode Mode Normal Mode. this mode device never enters power down. eval board system, maximum allowable throughput rate(fsampl) this mode 65kSPS. Mode Mode selected then part will enter full shutdown between conversions. power time required both these modes necessary allow dummy conversion between every valid conversion. This explained more detail `Modes Operation' section AD7887 datasheet maximum throughput rate allowed this system when using either these modes 30kSPS. Mode Auto-Standby Mode. this mode power time much quicker than that from full shutdown, therefore dummy conversion necessarily required used this set-up. This mode functional present updated software will available website near future. from these conversions then analyzed AD7887 evaluation software. Another samples taken pressing again. Cont. Pressing this button causes software repeatedly perform conversions analyze them. Once conversions analysis been done samples, software automatically repeats process. continues this until pressed. Save. This saves samples file either later date with other software. samples saved either "volts", "ints" "binary". format these files ASCII text. Note that AD7887 software only load files saved "ints" format. Files saved "volts" "ints" formats used with packages such Mathcad. Files saved "binary" format viewing purposes only. Load. This allows user load data from file with .DAT extension. Only data that saved ints loaded analyzed. configuration file must loaded Setup" menu before data file analyzed. there EVALCONTROL BOARD connected then prog" button Setup" menu must Once configuration file been loaded, data loaded from .DAT file analyzed according settings Setup" menu. Reset. Choosing this option resets EVAL-CONTROL BOARD. Quit. This quits AD7887 evaluation software returns control operating system.
F10:
INFORMATION WINDOWS
Figure Setup Menu Screen
Single channel operation selected depressing "Single" button. Dual channel operation selected depressing "Dual" button. This turn allows user select between input channels using buttons. When using dual channel mode, user must ensure that onchip reference disabled AD7887 uses reference internally.l "Analog section shows analog input range offset voltage.
MAIN SCREEN
There three information windows main screen. left-hand window configuration window gives details about part being evaluated. shows name program that been downloaded EVALCONTROL BOARD, sampling frequency, number bits, analog input range part output code format part. right-hand large window Status window. This window provides feedback user what operations currently being performed software also displays error messages. Directly underneath status window small window that shows selected conversion sequence maximum minimum values most recently captured samples channels conversion sequence.
left part main screen contains eight buttons which selected using mouse using function keys from keyboard. These buttons actions they perform are: Info. This button shows information software. Setup. This button activates setup menu. Samp. When this pressed, software causes AD7887 perform number conversions determined setup menu (see above). data
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EVAL-AD7887CB
Test Mode
dual
right main screen Test Mode buttons. These buttons determine what sort testing done samples captured software. Both analysis analysis performed. function these buttons are: plot Choosing this button causes Digital Spectrum Analyzer appear bottom screen. Histogram: Choosing this button causes Histogram Analyzer displayed bottom screen. There other button near screen, beside "F10 Quit" button. This blackman-harris: When performing Fourier transform sampled data, this button determines whether data windowed blackman-harris window before transform. When this button data windowed. When this button off, data isn't windowed. Digital Spectrum Analyzer section more details.
DIGITAL STORAGE OSCILLOSCOPE.
When "dual" button oscilloscope screen divided into parts with sampled data display centered horizontal axis windowed data display centered another. When "dual" button off, both traces centered same horizontal axis. This button toggles sampled data trace off. This button toggles windowed data trace off.
HISTOGRAM ANALYZER
When samples data captured, they displayed Digital Storage Oscilloscope. blackman-harris button turned then windowed data also displayed oscilloscope. 'scope been designed similar conventional oscilloscope. right oscilloscope several buttons that control manner which data displayed 'scope. timebase oscilloscope automatically chosen software Time/Div "Auto" button user also select timebase clicking Time/Div window scrolling down through possible timebases. Similarly, vertical scale oscilloscope chosen automatically Volt/Div "Auto" button user also option selecting desired vertical scale similar manner selecting timebase. other buttons associated with oscilloscope are: grid This button toggles grid display oscilloscope off. axis This button toggles axis display oscilloscope text This button toggles text displayed oscilloscope screen off. line When line button displayed samples joined together lines. When this button off, samples displayed points. When this button component sampled signal removed signal displayed. This effect centering signal vertically oscilloscope screen. When this button off, component removed signal displayed with horizontal axis corresponding code display option useful zooming lowlevel signal that large offset.
histogram analyzer counts number occurrences each code captured samples displays histogram these counts. most frequently occurring code displayed center histogram. analyzer normally used with input signal calculates mean standard deviation sampled data. mean standard deviation displayed both volts units size converter. histogram gives good indication noise performance ADC. standard deviation shows directly noise introduced conversion process. Each channel sequence viewed turn using channel select buttons right histogram screen
Figure Histogram Screen
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Figure AD7887 Evaluation Board Circuit Diagram
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Table Eval-AD7887CB Bill Materails.
Reference Semiconductors:
Dsrtn
Manufacturer
Splr
AD7887BR OP467GP AD780AN 74HC04N SD103C
Fairchild ITT/Cannon 378-252
Capacitors: 10nf Multilayer Ceramic 68pf Multilayer Ceramic 0.1uF Multilayer Ceramic 10uF Tantalum Philips Philips Philips 143-729 237-024 262-257 643-683
Resistors: 0.5W (MF50 Series) 1.21K 0.25W 0.1% (RC55 Series) 3.65K 0.25W 0.1% (RC55 Series) Multicomp Welwyn Welwyn 544-280 544-080 544-546
Miscelleanous: LK5-9 LK1-9 J1-5 Each Corner jumper jumper jumper Shorting shunt gold socket DIN41612 Angle plug terminal block terminal block Ultra profile socket pins Rubber Stick-on Feet Harwin Harwin Harwin Harwin M/Acom Harting Augat Augat Harwin 511-833 511-833 511-833 150-410 310-682 104-986 151-789 151-790 519-959 148-922
-10-
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EVAL-AD7887CB
Figure Component Side Artwork
Figure Solder Side Artwork
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-11-
Figure AD7887 Evaluation Board Component Placement Drawing.

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