Evaluation Board Signal Conditioning EVAL-AD7714-5EB OPERATING AD
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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 INTRODUCTION
Evaluation Board Signal Conditioning EVAL-AD7714-5EB
OPERATING AD7714-5 EVALUATION BOARD Power Supplies
This Application Note describes evaluation board AD7714-5, 24-Bit signal conditioning ADC. AD7714 complete analog front low-frequency applications providing either three fully-differential five pseudodifferential input channels. device accepts low-level signals directly from transducer outputs serial digital word. employs sigma delta technique realize bits missing codes performance. Full data AD7714-5 available AD7714 data sheet available from Analog Devices should consulted conjunction with this Application Note when using Evaluation Board. Included evaluation board, along with AD7714-5, AD780, +2.5 ultra high precision bandgap reference, 2.4576MHz crystal digital buffers buffer signals from edge connectors. 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.
evaluation board four power supply input pins: AVDD, AGND, DVDD DGND. AD7714-5 specified with AVDD +5V. Therefore, AVDD voltage supplied board must +5V. This AVDD voltage also used power AD780 reference. AD7714-5 operated from DVDD voltage. When using 9-way D-type connector interface evaluation board possible apply DVDD voltage either DVDD input terminal board. However, when using 36-way Centronics connector interface board, voltage applied DVDD input terminal must +5V. This because Centronics connector intended connection printer port with signals driven from supplies. board from single supply, simply connect AVDD DVDD inputs together. Both AGND DGND inputs provided board. AGND connects AD7714-5 AGND also connects AD780. DGND connects DGND AD7714 digital chips board. AGND DGND planes connected AD7714. 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 AIN4 AIN5 AIN6 AD7714 BUFFERS 36-WAY CENTRONICS CONNECTOR
AD780 REFERENCE MCLK
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-AD7714-5EB
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 AD7714. master clock source comes from on-board crystal from external clock source SKT6. This double link both links must moved together correct operation. With both links position external clock option selected externally applied clock routed MCLK AD7714. With both links position on-board crystal selected provides master clock AD7714.
This link option used determine whether AD7714 normal operating mode STANDBY (power down) mode. With this link position STANDBY input connected logic high thus configuring part normal operation. With this link position STANDBY connected logic AD7714 placed power down mode where power dissipation typically 100µW.
This link option used control buffer option input AD7714 (i.e. determine voltage AD7714 BUFFER pin). With this link position logic high connected this input. This connects on-chip buffer series with analog input which allows inputs handle higher source impedance. With this link position logic connected buffer option select input. With this input low, on-chip buffer analog input shorted out.
This link controls polarity serial clock. With this link position connected logic high. With this input high, first transition serial clock data transfer operation from high low. With this link position input connected logic first transition serial clock data transfer operation from high.
This link option used select reference source AD7714's IN(-) input. With this link position IN(-) AD7714 connected directly AGND. With this link position IN(-) AD7714 connected SKT10. external voltage connected SKT10 used IN(-).
This link option used select reference source AD7714's IN(+) input. With this link position AD7714 connected directly output on-board reference, AD780. With this link position IN(+) AD7714 connected SKT9. external voltage connected used IN(+).
This link option depending type reference being used evaluation board. Although board equipped with AD780, REF-192 +2.5V reference replace same socket. When REF-192 reference used board, link should position position REF-192's shutdown connected STANDBY AD7714 controlled LK2. When AD780 reference used, link should position AD780 does have shutdown pin.
LK8-LK13
These links series with through analog inputs respectively. With these links place, analog input relevant input connected directly respective input part. example, with place, analog signal applied SKT7 connected directly AIN6 AD7714. These links removed that input signals SKTs connected component grid signal conditioning before being applied analog inputs AD7714. REV.
EVAL-AD7714-5EB
Setup Conditions
Table shows position which links when evaluation board sent out.
Table Initial Link Positions
Link
Position Function. Both links position select on-board crystal oscillator master clock board. Connects STANDBY high thus configures part normal operation. on-chip buffer AD7714 shorted out. Connects high such that first transition serial clock data transfer from high low. IN(-) connected directly AGND. IN(+) connected output on-board AD780 reference. DGND Selects AD780 voltage reference. Connects analog inputs from input sockets directly respective analog input pins AD7714. DOUT DVDD
Figure SKT1 Configuration
Table SKT1 Designations1
SCLK
Serial Clock. signal this buffered before being applied SCLK AD7714. Logic Output. This buffered version signal AD7714's DRDY pin. Chip Select. signal this buffered before being applied AD7714. Reset Input. signal this buffered before being applied RESET AD7714. Serial Data Input. Data applied this buffered before being applied AD7714's pin. Ground reference point digital circuitry. Connects DGND plane evaluation board. Serial Data Output. This buffered version signal AD7714's DOUT pin. Digital Supply Voltage. DVDD voltage applied board's DVDD input terminal, then voltage applied this connector will supply DVDD evaluation board. Logic Input. signal this buffered before being applied SYNC AD7714.
DRDY
RESET
LK8-LK13
EVALUATION BOARD INTERFACING
Interfacing evaluation board either 36-way Centronics connector,SKT11, 9-way D-Type connector, SKT1. pinout SKT1 connector given Figure corresponding designations given Table pinout this SKT11 connector shown Figure designations given Table III. evaluation board should powered before cable connected either connectors. SKT11 used connect evaluation board printer port (parallel port) Connection between direct standard parallel printer port cable. SKT1 used connect evaluation board other system.
SYNC
NOTE explanation AD7714 functions mentioned here given Table part SKT11 designations description.
REV.
EVAL-AD7714-5EB
Figure SKT11 Configuration
Table III. SKT11 Designations
Connect. This connected evaluation board. Serial Data Input. Data applied this buffered before being applied AD7714's pin. serial data applied written input shift register part. Data from this input shift register transferred calibration registers, mode register, communications register filter selection registers depending register selection bits Communications Register. Reset Input. signal this buffered before being applied RESET AD7714. RESET active input which resets control logic, interface logic, calibration coefficients, digital filter analog modulator part power-on status. Chip Select. signal this buffered before being applied AD7714. active logic input used select AD7714. With this input hard-wired low, AD7714 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 AD7714. Serial Clock. signal this buffered before being applied SCLK AD7714. external serial clock applied this input access serial data from AD7714. This serial clock continuous clock with data transmitted continuous train pulses. Alternatively, non-continuous clock with information being transmitted AD7714 smaller batches data. Logic Input. signal this buffered before being applied SYNC AD7714. SYNC input allows synchronisation digital filters analog modulators across number AD7714s. 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 AD7714 before they applied SKT11. Logic output. This buffered version signal AD7714's DRDY pin. logic DRDY output indicates that output word available from AD7714 data register. DRDY will return high upon completion read operation full output word. data read taken place, after output update, DRDY line will return high 500* tCLK cycles prior next output update. This gives indication when read operation should attempted avoid reading from data register being updated. DRDY also used indicate when AD7714 completed on-chip calibration sequence. Connect. These pins connected evaluation board. Serial Data Output. This buffered version signal AD7714's DOUT pin. Serial data from output shift register part clocked this pin. This output shift register contain information from calibration registers, mode register, communications register, filter selection registers data register 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 DRDY
11-12
DOUT
14-18 19-30 31-36
DGND
REV.
EVAL-AD7714-5EB
SOCKETS
There eleven sockets AD7714-5 evaluation board. function these sockets outlined Table
Table Socket Functions Socket Function
SKT1 SKT2
9-Way D-Type Connector which used digital interfacing evaluation board. Sub-Minature Connector. analog input signal AIN1 input AD7714 applied this socket. Sub-Minature Connector. analog input signal AIN2 input AD7714 applied this socket. Sub-Minature Connector. analog input signal AIN3 input AD7714 applied this socket. Sub-Minature Connector. analog input signal AIN4 input AD7714 applied this socket. Sub-Minature Connector. master clock signal MCLK input AD7714 applied this socket when board configured externally-applied master clock. Sub-Minature Connector. analog input signal AIN6 input AD7714 applied this socket. Sub-Minature Connector. analog input signal AIN5 input AD7714 applied this socket. Sub-Minature Connector. reference voltage IN(+) input AD7714 applied this socket when board configured externally-applied reference voltage. Sub-Minature Connector. reference voltage IN(-) input AD7714 applied this socket when board configured externally-applied reference voltage. 36-Way Centronics Connector which used digital interfacing evaluation board. This connector should used when connecting board parallel printer port evaluation software.
evaluation software simply executable file. program provides number different menu-type screens, each screen containing several function options. each these menu-screens user choose function pressing associated number click required option using mouse. Alternatively, user scroll down screen using arrow keys required function then RETURN key. "README" file gives detailed description each menus procedure software evaluate board. brief description procedure outlined below.
Configuration
SKT3
SKT4
first menu gives options type being used. printer port needs configured correctly many different PC-types interfacing AD7714. Choose required printer type from menu. next menu gives options port address used. Choose required port address. printer port configured operation with AD7714 evaluation board.
AD7714 Configuration
SKT5
SKT6
next menu sequence Main Menu which contains options. These allow reading from data register, configuration communications register, file options (read write data files), noise analysis, printer port setup resetting AD7714. first option select this Main Menu option (Communications Register). This calls Comms Register Menu which options. first option select Comms Register Menu option (Channel Selection) which allows user required analog input channel. After selecting desired channel pair Channel Configuration Menu, program returns Main Menu. Select option (Filter Registers) which allows user enter clock frequency being used, program filter cutoff, data word length required bipolar unipolar operation. After selecting required parameters Filter Registers Menu, choose option (Exit) return Comms Register Menu. this menu select option (Mode Register). This brings Mode Register Menu which allows gain programmed, turns on/off burnout current, allows software filter synchronization allows various calibration modes selected. Calibration should last operation completed. When calibration complete, choose option (Exit) return Comms Register Menu. parameters part should choose option (Exit) return Main Menu. From Main Menu select option (Read from Data Register). number readings required prompted read operation proceeds value read from AD7714's data register displayed screen.
Data Analysis
SKT7
SKT8
SKT9
SKT10
SKT11
RUNNING AD7714 INTERFACE SOFTWARE.
Included evaluation board package PC-compatible disk which contains software controlling evaluating performance AD7714 using printer port There files disk, executable file "README" text file which gives details functions available executable program. executable program runs under advised that user copies this file system hard disk obtain optimum performance from software. REV.
When data been read, program returns user Main Menu. possible write data which been read file selecting option (Files Option) analyze data selecting option Noise Analysis). Noise Menu allows user statistical results from data, plot data, plot histogram data screen perform rolling average data. return Main Menu from Noise Menu choose option (Exit).
EVAL-AD7714-5EB
5082- 2810
CENTRONICS CONNECTOR
RESET
SLCT SCLK SYNC DRDY DOUT DGND
74HCT244
0.1µF
5082- 2810
DGND
0.1µF
0.1µF
RESET
DOUT
DOUT RESET
74HC08
SKT1
74HC4050
DRDY SCLK
DRDY SCLK
DGND AGND SYNC MCLK AIN1 SYNC
DGND AGND SKT2 SKT3
SKT6
AD7714
MCLK
SKT4
BUFFER
XTAL1
SKT7
SKT5
SKT8
IN(-)
SKT10 AVDD
10µF 0.1µF
10µF 0.1µF STANDBY IN(+) 0.1µF
SKT9
AD780/ REF-192
10µF
0.1µF
Figure AD7714-5 Evaluation Board Circuit Diagram
REV.
EVAL-AD7714-5EB
COMPONENT LISTING MANUFACTURERS Intergrated Circuits Component Location Vendor
AD7714 AD780 74HC4050 74HCT08 74HCT244 5082-2810
Capacitors Component
Analog Devices Analog Devices Motorola Motorola Integrated Device Technology Hewlett Packard
Location
Vendor
10µF Tantalum 0.1µF Ceramic(X7R 20%) 33pF Ceramic Open Circuit
C10, C15, C18, C16, C11, C12, C13,
AVX- Kyocera Mftrs TAG106MO16 Philips Mftrs CW20C 104M Philips Mftrs 34339
Resistors Component Location Vendor
0.25W Carbon Film Resistor 0.25W Carbon Film Resistor Short Circuits
Bourns Bourns
Link Options Component Location Vendor
Headers
(4x2 way) Lk2, Lk3, Lk4, Lk5, Lk6, way) Lk8, Lk9, Lk10, Lk11, Lk12, Lk13 (1x2 way)
Harwin Mftrs M20-9993606
Shorting Plugs
Headers required)
Harwin Mftrs M7571-05
REV.
EVAL-AD7714-5EB
Switch Component Location Vendor
Push Button Switch
Omron Mftrs B3F1000
Sockets Component Location Vendor
Miniature Connectors 9-Way D-Type Connector Centronics Connector 24-Pin Socket Socket 16-Pin Socket Socket 20-Pin Socket Wire Wrap Pins
SKT2 SKT1 DGND, AGND, AVDD, DVDD
Greenpar Mftrs C65N07G999X99 McMurdo Mftrs SDE9PNTD Fujitsu Mftrs FCN785J036G0 Harwin Mftrs D28xx-01 Pins
Bicc Vero Mftrs 663472C
Crystal Oscillator Component Identification Location Vendor
2.4576MHz Oscillator
Xtal
Mftrs A166C
REV.
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