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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 Power Supplies
Evaluation Board 16-Bit Sigma Delta EVAL-AD7715-5EB
OPERATING AD7715-5 EVALUATION BOARD
This Application Note describes evaluation board AD7715-5, 16-Bit signal conditioning ADC. AD7715 complete analog front low-frequency applications providing fully-differential input channel. device accepts low-level signals directly from transducer outputs serial digital word. employs sigma delta technique realize bits missing codes performance. Full data AD7715-5 available AD7715 data sheet available from Analog Devices should consulted conjunction with this Application Note when using Evaluation Board. Included evaluation board, along with AD7715-5, 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. AD7715-5 specified with AVDD +5V. Therefore, AVDD voltage supplied board must +5V. This AVDD voltage also used power AD780 reference. AD7715-5 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 AD7715-5 AGND also connects AD780. DGND connects DGND AD7715 digital chips board. AGND DGND planes connected AD7715. 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
DGND 9-WAY D-TYPE CONNECTOR
36-WAY CENTRONICS CONNECTOR
AD780 REFERENCE MCLK
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
There number link options evaluation board which should required operating setup before using board. functions these link options described detail below.
This option selects master clock option AD7715. master clock source comes from on-board crystal from external clock source SKT7. This double link both links must moved together correct operation. With both links position external clock option selected externally applied clock routed MCLK AD7715. With both links position on-board crystal selected provides master clock AD7715.
This link option used select reference source AD7715's IN(-) input. With this link position IN(-) AD7715 connected directly AGND. With this link position IN(-) AD7715 connected SKT5. external voltage connected SKT5 used IN(-).
This link option used select reference source AD7715's IN(+) input. With this link position AD7715 connected directly output on-board reference, AD780. With this link position IN(+) AD7715 connected SKT6. 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 either position position position REF-192's shutdown connected DVDD, placing REF-192 normal mode operation. position REF-192's shutdown connected DGND, placing REF-192 power down mode. When AD780 reference used, link should position AD780 does have shutdown pin.
This link series with analog input. With this link place, analog input SKT3 input connected directly AIN(+) input part. This link removed that input signal SKT3 connected component grid signal conditioning before being applied AIN(+) input AD7715.
This link series with analog input. With this link place, analog input SKT4 input connected directly AIN(-) input part. This link removed that input signal SKT4 connected component grid signal conditioning before being applied AIN(-) input AD7715.
Table shows position which links when evaluation board sent out.
Table Initial Link Positions
Position Function. Both links position select on-board crystal oscillator master clock board. IN(-) connected directly AGND. IN(+) connected output on-board AD780 reference. Selects AD780 voltage reference. Connects input signal from SKT3 directly AIN(+) AD7715. Connects input signal from SKT4 directly AIN(-) AD7715.
Figure SKT1 Configuration
Table SKT1 Designations1
Serial Clock. signal this buffered before being applied SCLK AD7715. Logic Output. This buffered version signal AD7715's DRDY pin. Chip Select. signal this buffered before being applied AD7715. Reset Input. signal this buffered before being applied RESET AD7715. Serial Data Input. Data applied this buffered before being applied AD7715's pin. Ground reference point digital circuitry. Connects DGND plane evaluation board. Serial Data Output. This buffered version signal AD7715's DOUT pin. Digital Supply Voltage. DVDD voltage evaluation board supplied this provided voltage applied main DVDD terminal. Connect. This connected evaluation board.
EVALUATION BOARD INTERFACING
Interfacing evaluation board either 9-way D-Type 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.
NOTE explanation AD7715 functions mentioned here given Table part SKT2 designations description.
Figure SKT2 Configuration
Table III. SKT2 Designations
Connect. This connected evaluation board. Serial Data Input. Data applied this buffered before being applied AD7715's pin. serial data applied written input shift register part. Data from this input shift register transferred communications register setup register depending register selection bits Communications Register. Reset Input. signal this buffered before being applied RESET AD7715. 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 AD7715. active logic input used select AD7715. With this input hard-wired low, AD7715 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 AD7715. Serial Clock. signal this buffered before being applied SCLK AD7715. external serial clock applied this input access serial data from AD7715. This serial clock continuous clock with data transmitted continuous train pulses. Alternatively, non-continuous clock with information being transmitted AD7715 smaller batches data. Connect. These pins connected evaluation board. Digital Supply Voltage. This provides supply voltage IC4, buffer chip which buffers output signals from AD7715 before they applied SKT2. Logic output. This buffered version signal AD7715's DRDY pin. logic DRDY output indicates that output word available from AD7715 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 AD7715 completed on-chip calibration sequence. Connect. These pins connected evaluation board. Serial Data Output. This buffered version signal AD7715's DOUT pin. Serial data from output shift register part clocked this pin. This output shift register contain information from communications register, setup register 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.
14-18 19-30 31-36
SOCKETS RUNNING AD7715 INTERFACE SOFTWARE
There seven sockets AD7715-5 evaluation board. function these sockets outlined Table
Table Socket Functions Socket Function
Included evaluation board package PC-compatible disk which contains software controlling evaluating performance AD7715 using printer port There total thirteen files distribution disk. 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 stsrts, 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. evaluation software does allow another application running under Windows access printer port while running. Control printer port returned when application quit.
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 Connector. analog input signal AIN(+) input AD7715 applied this socket. Sub-Minature Connector. analog input signal AIN(-) input AD7715 applied this socket. Sub-Minature Connector. reference voltage IN(-) input AD7715 applied this socket when board configured externally-applied reference voltage. Sub-Minature Connector. reference voltage IN(+) input AD7715 applied this socket when board configured externally-applied reference voltage. Sub-Minature Connector. master clock signal MCLK input AD7715 applied this socket when board configured externally-applied master clock.
SLCT DRDY DOUT DGND
DGND AGND SKT3
DGND AGND MCLK AIN(+)
Figure AD7715-5 Evaluation Board Circuit Diagram
COMPONENT LISTING MANUFACTURERS Intergrated Circuits Component Location Vendor
AD7715 AD780 74HC4050 74LS08 74LS244 5082-2810
Analog Devices Analog Devices Philips Texas Instruments Texas Instruments Hewlett Packard
10µF Tantalum 0.1µF Ceramic(X7R 20%) 33pF Ceramic Open Circuit
AVX- Kyocera Mftrs TAG106MO16 Philips Mftrs CW20C 104M Philips Mftrs 34339
0.25W Carbon Film Resistor 3.3k 0.25W Carbon Film Resistor 1M±5% 0.25W Carbon Film Resistor Short Circuits
Link Options Component
Bourns Bourns Bourns
(4x2 way) Lk2, way) (3x2 way) Lk5, Lk16 (1x2 way)
Harwin Mftrs M20-9993606
Harwin Mftrs M7571-05
Switch Component Location Vendor
Push Button Switch
Omron Mftrs B3F1000
Sockets Component Location Vendor
Miniature Connectors 9-Way D-Type Connector Centronics Connector 16-Pin Socket Socket 16-Pin Socket Socket 20-Pin Socket Wire Wrap Pins
SKT3 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
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