Evaluation Board Process Control EVAL-AD7731EB Interfacing this b

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Evaluation Board Process Control EVAL-AD7731EB Interfacing this b

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FEATURES Operates from Single Supply On-Board Reference Digital Buffers Various Linking Options Direct Hook-Up Printer Port Software Control Data Analysis
Evaluation Board Process Control EVAL-AD7731EB
Interfacing this board provided either through 36-Way Centronics Connector through 9-way D-type connector. External sockets provided analog inputs, external reference input option external master clock option.
OPERATING AD7731 EVALUATION BOARD Power Supplies
INTRODUCTION
This Technical Note describes evaluation board AD7731, Process Control ADC. AD7731 complete analog front-end process control applications. device proprietary programmable gain front which allows accept range input signal ranges including low-level signals directly from transducer. part features three buffered differential programmable gain analog inputs (which configured five pseudo-differential inputs) well differential reference input. Full data AD7731 available AD7731 data sheet available from Analog Devices should consulted conjunction with this Technical Note when using Evaluation Board. Included evaluation board, along with AD7731, AD780, +2.5 ultra high precision bandgap reference, 4.9152MHz crystal digital buffers buffer signals from edge connectors.
evaluation board four power supply input pins: AVDD, AGND, DVDD DGND. AD7731 specified with AVDD +5V. Therefore, AVDD voltage supplied board must +5V. This AVDD voltage also used power AD780 reference. board from single supply, simply connect inputs together. Both AGND DGND inputs provided board. AGND connects AD7731 AGND also connects AD780. DGND connects DGND AD7731 digital chips board. AGND DGND planes connected AD7731. Therefore, recommended connect AGND DGND elsewhere system avoid ground loop problems. When using single supply both AVDD DVDD, only ground connection should made board. This connection should made board's AGND input terminal. Both supplies decoupled their respective ground plane with 10µF tantalum 0.1µF ceramic disc capacitors.
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND DVDD DGND 9-WAY D-TYPE CONNECTOR
AIN1 AIN2 AIN3/D1 AIN4/D0 AIN5 AIN6 AD780 REFERENCE AVDD MCLK AD7731 BUFFERS 36-WAY CENTRONICS CONNECTOR
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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-AD7731EB
LINK OPTIONS
There number link options evaluation board which should required operating setup before using board. functions these link options described detail below.
Link Function
This option selects master clock option AD7731. master clock source comes from onboard crystal from external clock source SKT11. This double link both links must moved together correct operation. With both links position external clock option selected externally applied clock routed MCLK AD7731. With both links position on-board crystal selected provides master clock AD7731.
This link option used determine whether AD7731 normal operating mode STANDBY (power-down) mode. With this link position STANDBY input AD7731 connected logic high thus configuring part normal operation. With this link position STANDBY input AD7731 connected logic AD7731 placed power-down mode where power dissipation typically 100µW.
This link option used select reference source AD7731's IN(-) input. With this link position IN(-) AD7731 connected SKT10. external voltage connected SKT10 used IN(-). With this link position IN(-) AD7731 connected directly AGND.
This link controls polarity serial clock. With this link position AD7731 connected logic high. With this input high, first transition serial clock data transfer from high low. This link should position when operating with evaluation board software. With this link position AD7731 connected logic low. With this input low, first transition serial clock data transfer from high.
This link option used select reference source AD7731's IN(+) input. With this link position AD7731 connected directly output on-board reference, AD780. With this link position AD7731 connected directly AVDD. With this link position IN(+) AD7731 connected SKT9. external voltage connected SKT9 used IN(+).
This link series with AIN5 pin. With this link place, SKT7 connected directly AIN5 pin. This link removed that analog input signal SKT7 connected component grid signal conditioning before being applied AIN5 input AD7731.
This link series with AIN6 pin. With this link place, SKT8 connected directly AIN6 pin. This link removed that analog input signal SKT8 connected component grid signal conditioning before being applied AIN6 input AD7731.
This link series with AIN3/D1 pin. With this link place, SKT5 connected directly AIN3/D1 pin. This link removed that analog input signal SKT5 connected component grid signal conditioning before being applied AIN3 input AD7731.
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Link Options (ctnd) Link Function
This link series with AIN4/D0 pin. With this link place, SKT6 connected directly AIN4/D0 pin. This link removed that analog input signal SKT6 connected component grid signal conditioning before being applied AIN4 input AD7731.
LK10
This link series with AIN1 analog input. With this link place, analog input SKT3 input connected directly AIN1 input part. This link removed that input signal SKT3 connected component grid signal conditioning before being applied AIN1 input AD7731.
LK11
This link series with AIN2 analog input. With this link place, analog input SKT4 input connected directly AIN2 input part. This link removed that input signal SKT4 connected component grid signal conditioning before being applied AIN2 input AD7731.
SETUP CONDITIONS
Table shows position which links when evaluation board sent out.
Table Initial Link Positions Link Position Function.
Figure SKT1 Configuration
Table SKT1 Designations1
Both links position select on-board crystal oscillator master clock board. Normal Operating Mode. IN(-) connected directly AGND. AD7731 tied high. IN(+) connected AD780. SKT7 connected AIN5. SKT8 connected AIN6. SKT5 connected AIN3/D1. SKT6 connected AIN4/D0. SKT3 connected AIN1. SKT4 connected AIN2.
SCLK
LK10 LK11
Serial Clock. signal this buffered before being applied SCLK AD7731. Logic Output. This buffered version signal AD7731's pin. Chip Select. signal this buffered before being applied AD7731. Reset Input. signal this buffered before being applied RESET AD7731. Serial Data Input. Data applied this buffered before being applied AD7731's pin. Ground reference point digital circuitry. Connects DGND plane evaluation board. Serial Data Output. This buffered version signal AD7731's DOUT pin. Digital Supply Voltage. DVDD voltage evaluation board supplied this provided voltage applied main DVDD terminal. Connect. signal this buffered before being applied SYNC AD7731.
RESET
DGND
EVALUATION BOARD INTERFACING
Interfacing evaluation board either 9-way DType connector, SKT1, 36-way Centronics connector, SKT2. pinout SKT1 connector given Figure corresponding designations given Table pinout this SKT2 connector shown Figure designations given Table III. evaluation board should powered before cable connected either connectors. SKT2 used connect evaluation board printer port (parallel port) Connection between direct standard parallel printer port cable. SKT1 used connect evaluation board other system.
DOUT DVDD
NOTE
explanation AD7731 functions mentioned here given Table part SKT2 designations description.
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Figure SKT2 Configuration
Table III. SKT2 Designations
Connect. This connected evaluation board. Serial Data Input. Data applied this buffered before being applied AD7731's pin. serial data applied written input shift register part. Data from this input shift register transferred on-chip registers depending register selection bits Communications Register. Reset Input. signal this buffered before being applied RESET AD7731. RESET active input which resets control logic, interface logic, calibration coefficients, digital filter on-chip registers power-on status. Chip Select. signal this buffered before being applied AD7731. active logic input used select AD7731. With this input hard-wired low, AD7731 operates three-wire interface mode with SCLK, DOUT used interface device. used select device systems with more than device serial frame synchronisation signal communicating with AD7731. Serial Clock. signal this buffered before being applied SCLK AD7731. external serial clock applied this input access serial data from AD7731. This serial clock continuous clock with data transmitted continuous train pulses. Alternatively, non-continuous clock with information being transmitted AD7731 smaller batches data. Logic Input. signal this buffered before being applied SYNC AD7731. SYNC input allows synchronisation digital filters analog modulators across number AD7731s. While SYNC low, nodes digital filter, filter control logic, calibration control logic reset analog modulator also held reset state. Connect. These pins connected evaluation board. Digital Supply Voltage. This provides supply voltage IC4, buffer chip which buffers output signals from AD7731 before they applied SKT2. Logic output. This buffered version signal AD7731's pin. used status output both conversion calibration mode. conversion mode, logic output indicates that output word available from AD7731 data register. will return high upon completion read operation full output word. data read taken place after output update, line will return high prior next output update, remain high while update taking place return again. This gives indication when read operation should initiated avoid reading from data register being updated. calibration mode, goes high when calibration initiated returns indicate that calibration complete. Connect. These pins connected evaluation board. Serial Data Output. This buffered version signal AD7731's DOUT pin. Serial data from output shift register part clocked this pin. This output shift register contains information from nine on-chip registers depending register selection bits Communications Register. Connect. These pins connected evaluation board. Ground reference point digital circuitry. Connects DGND plane evaluation board. Connect. These pins connected evaluation board.
RESET
SCLK
SYNC
DVDD
11-12
DOUT
14-18 19-30 31-36
DGND
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EVAL-AD7731EB
SOCKETS RUNNING AD7731 INTERFACE SOFTWARE
There eleven sockets AD7731 evaluation board. Included evaluation board package PC-compatible function these sockets outlined Table disk which contains software controlling evaluating performance AD7731 using printer port There total thirteen files distribution disk.
Table Socket Functions Socket Function
SKT1
9-Way D-Type Connector which used digital interfacing evaluation board. 36-Way Centronics Connector which used digital interfacing evaluation board. This connector should used when connecting board parallel printer port evaluation software. Sub-Minature (SMB) Connector. analog input signal AIN1 input AD7731 applied this socket. Sub-Minature (SMB) Connector. analog input signal AIN2 input AD7731 applied this socket. Sub-Minature (SMB) Connector. Connects AIN3/D1 AD7731. Sub-Minature (SMB) Connector. Connects AIN4/D0 AD7731. Sub-Minature (SMB) Connector. Connects AIN5 AD7731. Sub-Minature (SMB) Connector. Connects AIN6 AD7731. Sub-Minature (SMB) Connector. reference voltage IN(+) input AD7731 applied this socket when board configured externallyapplied reference voltage. Sub-Minature (SMB) Connector. reference voltage IN(-) input AD7731 applied this socket when board configured externallyapplied reference voltage. Sub-Minature (SMB) Connector. master clock signal MCLK input AD7731 applied this socket when board configured externallyapplied master clock.
SKT2
software, user must have IBM-compatible Windows must installed. Start Windows and, using either command File Manager, start program called SETUP.EXE distribution disk. This automatically installs application sets window called ANALOG DEVICES. application ICON found here. start application, double click ICON. When program starts, user asked select printer port. correct selection depends what type computer being used (Desktop, Laptop etc). LPT1 works most machines. When using Compaq laptop, select PRN. different port selected time from MAIN MENU. After selecting printer port, program displays Main Menu outlined Figure There number buttons Main Menu which select variety different functions. These described below.
Program AD7731
SKT3
SKT4
SKT5 SKT6 SKT7 SKT8 SKT9
Pressing this button calls second screen which displays contents Status Register provides another buttons allowing user program on-chip registers. Figure shows "Program AD7731" screen. Pressing buttons this screen pulls further screen allowing functions register programmed. Figure gives example these screens (the screen programming Mode Register).
Read
Read Data button allows user access "read data" screen. this screen, user choose whether reading data noise analysis simply display. also allows user choose many outputs AD7731 should read noise analysis routines.
Noise Analysis
SKT10
SKT11
Noise Analysis button gives user access "noise analysis" screen. Here user look results data read terms code distribution, code spread etc. user also facility plot data versus time plot histogram results.
Reset AD7731
Pressing this button allows user access reset menu where either hardware reset (via RESET pin) software reset (via writing 1's) selected. user also hardware reset button board.
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Read from File
Pressing this button allows user read data from file noise analysis. data read either decimal hexadecimal format.
Write File
This button allows user store output data from AD7731 file either decimal hexadecimal format. This data used other programs subsequently read back AD7731 software.
Select Printer Port
This button allows user select printer port which AD7731 evaluation connected.
About
This provides details software revision.
Figure Main Screen
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Figure Program Screen
Figure Mode Register Screen
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Figure Evaluation Board Circuit Diagram
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Component Listing Manufacturers INTERGRATED CIRCUITS Component Location Vendor
AD7731BN AD780AN 74HC4050N 74C08N 74HC244N SD103C
CAPACITORS Component
Analog Devices Analog Devices Philips Texas Instruments Texas Instruments Farnell
Location
Vendor
10µF Tantalum 0.1µF Ceramic(X7R ±20%) 0.01uF 33pF Ceramic
AVX- Kyocera Mftrs TAG106MO16 Philips Mftrs CW20C 104M AVX-Kyocera Mftrs SR20X7R Philips Mftrs 34339
RESISTORS Component Location Vendor
Short Circuits 1M±5% 0.25W Carbon 0.25WCarbon Film Resistor Film Resistor
-Bourns Bourns Bourns 0.25W
0.25W Carbon Film Resistor
LINK OPTIONS Component Location Vendor
Headers
(4x2 way) Lk2, Lk3,Lk4 (2x2 way) (3x2 way) Lk6,Lk7,Lk8,Lk9,Lk10,Lk11 (1x2 way) Headers required)
Harwin Mftrs M20-9993606
Shorting Plugs
Harwin Mftrs M7571-05
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EVAL-AD7731EB
SWITCH Component Location Vendor
Sealed Push Button Switch
Omron Mftrs B3W1000
SOCKETS Component Location Vendor
Miniature Connectors 9-Way D-Type Connector Centronics Connector Terminal Block profile socket
SKT3 SKT11 SKT1 pins needed)
Greenpar Mftrs B65N07G999X99 McMurdo Mftrs SDE9PNTD Fujitsu Mftrs FCN785J036G0 Bulgin Harwin Farnell 519-959
CRYSTAL
OSCILLATOR Location Vendor
Component Identification
4.9152 Oscillator
XTAL1
Mftrs A127A
-10-
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Figure Component Placement Diagram.
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Evaluation Board Process Control EVAL-AD7731EB Interfacing this b

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