Evaluation Board 1MSPS, 12-/ 10-Bit ADCs EVAL-AD7476/77CB Devices

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Evaluation Board 1MSPS, 12-/ 10-Bit ADCs EVAL-AD7476/77CB Devices

Datasheet Thumbnail

Top Searches for this datasheet

FEATURES Full-Featured Evaluation Board AD7476/ AD7477 EVAL-CONTROL BOARD Compatible Stand Alone Capability On-Board Analog Buffering Reference Various Linking Options Software Control Data Analysis when used with EVAL-CONTROL BOARD INTRODUCTION
Evaluation Board 1MSPS, 12-/ 10-Bit ADCs EVAL-AD7476/77CB
Devices. External sockets provided input, input VBIASED input.
OPERATING AD7476/77 EVALUATION BOARD Power Supplies
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: AVDD, AGND, AGND, DVDD DGND. must connected AVDD input supply AD780 Ref195 voltage reference. AD7476/77 supplied from either AVDD external supply from selected voltage reference chip. used supply OP467 quad op-amp. connected both AGND inputs. DVDD input used supply separate 74LS04 DVDD pin. DGND input must tied supplies decoupled relevant ground plane with 10µF tantalum 0.1µF multilayer ceramic capacitors point where they enter board. supply pins quad op-amp references also decoupled AGND with 10µF tantalum 0.1µF ceramic capacitors. AD7476/77 AVDD supply decoupled AGND with 10uF tantalum 0.1µF multilayer ceramic capacitors. Extensive ground planes used this board minimize effect high frequency noise interference. There ground planes, AGND DGND. These connected location close AD7476/77.
This Technical Note describes evaluation board AD7476/77. AD7476/77 are, respectively, bit, high speed, power, successive-approximation ADC's. parts operate from single 2.35 5.25 power supply feature throughtput rates 1MSPS. parts contain low-noise, wide bandwidth track/hold amplifier which handle input frequencies excess 1MHz. Full data AD7476/77 available AD7476/77 data sheet available from Analog Devices should consulted conjunction with this Technical Note when using Evaluation Board. On-board components include AD780 which programmable +2.5 ultra high precision bandgap reference, OP467 quad op-amp used buffer analog inputs REF195 precision bandgap, voltage reference, providing reference voltage. There various link options which explained detail page
Interfacing this board through 96-way connector. This 96-way connector compatible with EVALCONTROL BOARD which also available from Analog Figure FUNCTIONAL BLOCK DIAGRAM
External Power Supplies Input Buffer
Voltage Reference
AD7476/77 SCLK
SDATA
Connector
Bias-up Circuit
Power Supply Circuit
REV.
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-AD7476/77CB
LINK SWITCH OPTIONS
There link options which must required operating setup before using evaluation board. functions these options outlined below.
Link Function.
This link option used select termination analog input buffer circuit. When this link "inserted" termination applied. When this link "removed" termination removed. This link option controls program AD780 voltage reference. When this link "inserted" AD780 output voltage +3.0 When this link "removed" AD780 output voltage +2.5 This link used select termination input bias-up circuit. When this link "inserted" termination applied. When this link "removed" termination removed. This link option used connect output either REF195 AD780 AD7476/77 link position When this link position AD780 supplies voltage AD7476/77. When this link position REF195 supplies voltage AD7476/77. 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 AD7476/77 pin. this configuration bipolar analog input applied socket biased bias circuit presented Vbiased uni-polar signal biased around VDD/2. When this link option placed position "B", bias voltage AGND. this configuration biasup circuit used. This link option used select source supply. position supplied from EVAL-CONTROL BOARD through connector. position supplied from external source through power connector, This link option used select source supply. position supplied from EVAL-CONTROL BOARD through connector. position supplied from external source through power connector, These links control transfer data from AD7476/77 during conversion various frequencies SCLK. Link should position slower SCLK frequencies, giving valid data rising edge. Link should position fast SCLK frequencies, giving valid data following edge. This link selects source supply 74LS04. When this link position "A", power supplied from same power source supplying AD7476/ pin. When this link position "B", power must must supplied from external source power connector, This link option used connect input analog buffer input socket GND. When this link position socket tied input buffer. this configuration, analog signal applied input socket buffered presented AD7476/77 input. When this link position buffer input tied AGND. This link selects source supplied AD7476/77. When this link position must supplied from external source When this link position supplied from EVAL-CONTROL BOARD. When this link position supplied from either AD780 REF195 references.
LK8-9
LK10
LK11
LK12
REV.
EVAL-AD7476/77CB
SET-UP 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 Removed Removed Removed
Function. termination resistor applied input circuit. AD780 provide +2.5V reference. termination resistor applied input bias-up circuit. This relevant position LK12. EVAL-CONTROL BOARD selected bias voltage optional bias-up/filter circuit. +12V supplied from EVAL-CONTROL BOARD -12V supplied from EVAL-CONTROL BOARD SCLK signal from EVAL-CONTROL BOARD inverted, (for faster values SCLK). SCLK signal from EVAL-CONTROL BOARD inverted, (for faster values SCLK). This relevant position LK9, 74LS04 use). connected input analog input buffer. AD7476/77 supplied from EVAL-CONTROL BOARD
LK10
Removed
LK11 LK12
REV.
EVAL-AD7476/77CB
EVALUATION BOARD INTERFACING
Interfacing evaluation board 96-way connector, used connect evaluation board EVAL-CONTROL BOARD other system. pinout connector shown Figure designations given Table
Table 96-Way Connector Functions.
AVDD AGND DGND AGND AGND AGND AGND AGND AGND DGND DGND TFS0 SCLK0 DGND
RowB
RowC
DGND
DGND RFS0 SCLK0
Figure Configuration 96-Way Connector,
96-Way Connector Description
Data Receive Zero. This input connected SDATA AD7476/77.
TFS0/RFS0 Transmit/Receive Frame Sync Zero. These outputs connected AD7476/77. SCLK0 Serial Clock Zero. This serial clock connected SCLK AD7476/77 with option inverting buffer. Digital Ground. These lines connected digital ground plane evaluation board. allows user provide digital supply connector along with other digital signals. Analog Ground. These lines connected analog ground plane evaluation board. Analog Supply. These lines connected AVDD supply line board. Supply. This line connected supply line board LK6. Supply. This line connected supply line board LK7.
DGND
DGND
DGND
DGND
DGND
AGND AVDD +12V -12V
DGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AVDD
DGND AGND AGND AGND AGND AGND AGND
AGND AVDD
Note unused pins 96-way connector shown.
REV.
EVAL-AD7476/77CB
SOCKETS OPERATING WITH EVAL-CONTROL BOARD
There three input sockets relevant operation AD7476/77 this evaluation board. function these sockets outlined Table III.
Table III. Socket Functions
Socket
Function Sub-Miniature Socket analog 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 AD7476/77 provided EVAL-CONTROL BOARD when under control AD7476/77 software which provided with AD7476/77 evaluation board package. This EVAL-CONTROL BOARD will also operate with Analog Devices evaluation boards which with letters their title. 96-way connector EVAL-AD7476/77CB plugs directly into 96-way connector EVAL-CONTROL BOARD. power supplies required system. EVAL-CONTROL BOARD generates required supplies itself EVAL-AD7476/ 77CB. EVAL-CONTROL BOARD powered from transformer. This standard transformer capable supplying current available accessory from Analog Devices under following part numbers: EVAL-110 VAC-US: EVAL-220 VAC-UK: EVAL-220 VAC-EU: U.S. Japan U.K. Europe
CONNECTORS
There three connectors AD7476/77 evaluation board outlined Table
Table Connector Functions
Connector
Function 96-Way Connector used Interface EVAL-CONTROL BOARD. External AGND power connector. External AGND power connector.
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 EVAL-CONTROL BOARD package.
REV.
EVAL-AD7476/77CB
Figure Main Screen used. When button pressed, highlighted screen. next button highlighted using Included EVAL-AD7476/77CB evaluation board previous button holding down shift package PC-compatible disk which contains software together. highlighted button controlling evaluating performance also pressed pressing space bar. Pressing AD7476/77 when operated with EVAL-CONESC halts operation currently progress. this TROL BOARD. EVAL-AD7476/77CB Demonstradocument, button activated from keyboard tion/Evaluation Software runs under later then used shown bold button name. requires minimum 386-based machine with 400kB example, prog" highlighted bold, base 500kB free hard disk space. user indicating that button activated pressing interface dedicated program written espep key. cially AD7476/77.
SOFTWARE DESCRIPTION
disk which accompanies EVAL-AD7476/77CB contains several files. user should create directory main drive label this "AD7476/77". Then, files EVAL-AD7476/77CB disk should copied into this directory. Mouse Driver should enabled before running software. this been loaded, program will run. software, simply make AD7476/77 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 AD7476/ 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 onscreen pointer button activated click. keyboard, simply press appropriate highlighted button. Lower case letters must
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 EVALCONTROL BOARD with EVAL-AD7476/ 77CB. Firstly, configuration file must chosen. configuration file contains default configuration information EVAL-CONTROL BOARD, Digital Spectrum Analyzer Digital Storage Oscilloscope. also tells AD7476/77.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 ADSP2111. However, prog" button then .HIP file downloaded ADSP-2111. REV.
EVAL-AD7476/77CB
There configuration files AD7476. (these AD7476 AD7476D) AD7477 (these AD7477 AD7477D). Each file particular certain mode operation device. modes operation selection AD7476/77 datasheet. AD7476 file normal mode program AD7476. This should execute when button pressed after AD7476 configuration file been loaded. When button pressed conversion result will output screen either plot historgram. AD7476 program also offers user option entering "power down" mode. This done entering setup screen (see figure using Power down button. there will valid data from this operation, there will result screen. exit "powerdown" mode user must "Power part before preforming valid conversion. This done again entering setup screen pressing "Power button. there valid data from this dummy conversion there result output screen. AD7477 program offers same options AD7476 program configured part (AD7477). When AD7476D configuration file loaded offers user "power convert powerdown" sequence option. This program ideal when device being operated constantly, saves power. result from conversion output screen either plot histogram. perform same sequence (power convert powerdown)on AD7477 part, AD7477D configuration file should used. MAIN SCREEN 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 AD7476/77 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 AD7476/77 evaluation software returns control operating system.
F10:
INFORMATION WINDOWS
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.
Test Mode
Figure Setup Menu Screen left part main screen contains eight buttons which selected using mouse using function keys from keyboard. These buttons actions they perform are:
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.
Info. This button shows information software. Setup. This button activates setup menu. Samp. When this pressed, software causes AD7476/77 perform number conversions determined setup menu (see above). data from these conversions then analyzed AD7476/77 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
REV.
EVAL-AD7476/77CB
DIGITAL STORAGE OSCILLOSCOPE.
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
dual
this button off, component removed signal displayed with horizontal axis corresponding code display option useful zooming low-level signal that large offset. 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
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.
Figure Histogram Screen
REV.
EVAL-AD7476/77CB
Figure AD7476/77 Evaluation Board Circuit Diagram
REV.
EVAL-AD7476/77CB
Table AD7476/77 Evaluation Board Bill Materials Qty. Reference Designator Description/Value Manuf. Supplier
AD7476ART/AD7477ART AD711KN ADOP467G 74LS04 ADREF195G AD780AN 0.25W 0.1% RC55 0.25W 0.1% RC55 0.25W 0.1uF Ceramic 1206 Case 10uF TAJ-C Case 68pF Ceramic 0.01uF Ceramic
AD7476ART/77ART AD711KN ADOP467G DM74LS04N ADREF195GP AD780AN Welwyn Welwyn Multicomp 12065C104KATDA TAJC106K020X MR051A680JT0001 MCDR25103X7RK0050 MCDR25104X7RK0050
373-450 339-179 339-635 543-070 895-210 498-798 669-714 750-890 750-920
0.1uF Ceramic 10uF Tant. LK11 LK12 LK12 Each Corner Gold Plated DIN41612 plug Power Connector Power Connector Jumper Jumper Jumper Shorting links White Testpoint Ultra profile socket pins Rubber Stick feet EVAL-AD7476CB
-10-
TAP10K35CCSY
664-881
MA-com Harting 0903-196-7921 Lumberg KRM2 Lumberg KRM3 Harwin Harwin Harwin Harwin Keystone Cat. 5002 Harwin
310-682 104-986 151-785 151-786 511-705 511-780 511-780
150-410
Futura Elect. 519-959 148-922 P.C.B.
REV.
EVAL-AD7476/77CB
Figure Component Side Artwork
Figure Solder Side Artwork
REV.
-11-
EVAL-AD7476/77CB
Figure AD7476/77 Component Placement Drawing.
-12-
REV.

Evaluation Board 1MSPS, 12-/ 10-Bit ADCs EVAL-AD7476/77CB Devices

Top Searches for this datasheet

Other recent searches