EVAL-AD7685CB Analog Devices Inc, EVAL-AD7685CB Datasheet

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EVAL-AD7685CB

Manufacturer Part Number
EVAL-AD7685CB
Description
BOARD EVAL FOR AD7685
Manufacturer
Analog Devices Inc
Series
PulSAR®r
Datasheet

Specifications of EVAL-AD7685CB

Number Of Adc's
1
Number Of Bits
16
Sampling Rate (per Second)
250k
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
±VREF
Power (typ) @ Conditions
10mW @ 250kSPS
Voltage Supply Source
Single
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7685
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Preliminary Technical Data
FEATURES
Versatile analog signal conditioning circuitry
On-board reference, crystal oscillator and buffers
16-bit Parallel Buffered Outputs
Ideal for DSP and data acquisition card interfaces
Analog and digital prototyping area for breadbording the
target system
Stand-alone operation or Eval control board compatibility
PC software for control and data analysis
LabVIEW
GENERAL DESCRIPTION
The EVAL-AD768x/AD769x/AD794xCB is an evaluation board
for the AD768x/AD769x/AD794x high resolution ADC (see the
Ordering Guide at the end of this document for a product list).
The AD768x/AD769x/AD794x evaluation board is designed to
demonstrate the ADC's performance and to provide an easy to
understand interface for a variety of system applications. A full
Rev. Pr F
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
1
driver to develop custom application
Evaluation Board AD768x/AD769x/AD794x
Figure 1.
EVAL-AD768x/AD769x/AD794xCB
description of the AD768x/AD769x/AD794x is available in the
Analog Devices AD768x/AD769x/AD794x data sheet and
should be consulted when utilizing this evaluation board.
The EVAL-AD768x/AD769x/AD794xCB is ideal for use with
either Analog Devices EVAL-CONTROL BRD2/BRD3
(EVAL-CONTROL BRDx) to run the Analog devices evaluation
software and to develop a specific application using LabVIEW,
or as a stand-alone evaluation board.
The EVAL-CONTROL BRDx is sold separately from the EVAL-
AD768x/AD769x/AD794xCB, is required to run the evaluation
software, is not required in stand alone mode and can be reused
with many Analog Devices ADCs.
1
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
Labview is a trademark of National Instruments.
© 2006 Analog Devices, Inc. All rights reserved.
www.analog.com

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EVAL-AD7685CB Summary of contents

Page 1

... BRDx) to run the Analog devices evaluation software and to develop a specific application using LabVIEW stand-alone evaluation board. The EVAL-CONTROL BRDx is sold separately from the EVAL- AD768x/AD769x/AD794xCB, is required to run the evaluation software, is not required in stand alone mode and can be reused with many Analog Devices ADCs. ...

Page 2

... EVAL-AD768x/AD769x/AD794xCB TABLE OF CONTENTS Detailed Description .................................................................... 3 Using the EVAL-AD768x/AD769x/AD794xCB Software ...... 3 Testing Methods ........................................................................... 4 REVISION HISTORY 02/06—PrF Version 05/05—PrE Version Preliminary Technical Data Use as a Standalone Evaluation Board........................................4 Ordering Guide .......................................................................... 18 ESD Caution................................................................................ 18 Rev Page ...

Page 3

... Table 1, and the available test points are listed in Table 2. The EVAL-AD768x/AD769x/AD794xCB is configured in the factory with the front-end amplifiers U6 and U7 set to a gain of 1. The board is set to be powered through the EVAL- CONTROL BRDx. Buffered conversion data is available at the output parallel bus and on the 96-pin connector P3 and is valid during the falling edge of BBUSY on P3 ...

Page 4

... One possibility is to filter the input signal from the AC source. There is no suggested band-pass filter but consideration should be taken in the choice. Decimated Testing (Averaging) This test can be run with a shorted input to evaluate dynamic range or as the AC test. Setup Requirements • ...

Page 5

... JP6 − JP7 7 V JP8 12 V JP9 VDD JP10 +VA JP11 3.3 V JP13 BUF+ JP25 BUF- Table 2. EVAL-AD768x/AD769x/AD794xCB Test Points Test Point TP1 TP2 TP3 TP4 TP5 TP6 TP7 TP8 TP9 TP10 TP11 TP12 TP13 Function Selection of the IN+ analog signal of U1 and U8. ...

Page 6

... EVAL-AD768x/AD769x/AD794xCB 8 4 GND 2 2.5/3v +VIN 8 2 GND 4 OVDD VDD REF GND Figure 2. Schematic (Analog section) Rev Page Preliminary Technical Data VDD 8 REF GND ...

Page 7

... Preliminary Technical Data EVAL-AD768x/AD769x/AD794xCB Figure 3. Schematic (Digital Section) Rev Page ...

Page 8

... EVAL-AD768x/AD769x/AD794xCB 3 6 VDD DOUT 14 SYNC OVDD VDD VDD 8 REF GND REF 1 Figure 4. Schematic (Option Section) Rev Page Preliminary Technical Data GND 15 16 SCK 1 DIN 3 2 GND 4 ...

Page 9

... Preliminary Technical Data SD 6 GND GND 5 Figure 5. Schematic (Power Section) Rev Page EVAL-AD768x/AD769x/AD794xCB VDD GND GND 5 ...

Page 10

... EVAL-AD768x/AD769x/AD794xCB Figure 6. Top-Side Silk-Screen (Not to Scale). Figure 7. Top-Side (Not to Scale). Rev Page Preliminary Technical Data ...

Page 11

... Preliminary Technical Data EVAL-AD768x/AD769x/AD794xCB Figure 8. Ground Layer (Not to Scale). Figure 9. Shield Layer (Not to Scale). Rev Page ...

Page 12

... EVAL-AD768x/AD769x/AD794xCB Figure 10. Bottom-Side Layer (Not to Scale). Figure 11. Bottom-Side Silk-Screen (Not to Scale). Rev Page Preliminary Technical Data ...

Page 13

... This is the performance window. These controls are for locking and resetting the display axis to the data minimum and maximum values. 6) These gives direct access to datasheets and evaluation documentation. 5) This window allows the samples to be taken once (F3) or continuous (F4). Also selects: Help screen, Save data to Excel (F5), Print (F8) and Quit (F10). The Help menu shows a description of the functionality of the chosen command ...

Page 14

... EVAL-AD768x/AD769x/AD794xCB These control the choice of chart type and X-units. Chart type selection of Histogram or Time and X-units of hexadecimal or Volts. The results are displayed in this chart. Also, the cursor (yellow) can be dragged desired location where the X-axis values and the Y-axis value will be displayed. ...

Page 15

... X-axis values and the Y-axis value will be displayed. Choice of either a Kaiser window or a Blackmann- Harris window from the is menu. Figure 14. FFT Screen Rev Page EVAL-AD768x/AD769x/AD794xCB AC test results are displayed here. Also the choice of viewing the amplitude of a certain FFT component can be selected from the FFT component menu. ...

Page 16

... EVAL-AD768x/AD769x/AD794xCB The AC test can also be displayed in the Time Domain as shown below. To view the Time domain output, select Time in this menu. Figure 15. Time-Domain Screen Rev Page Preliminary Technical Data ...

Page 17

... X-axis values and the Y-axis value will be displayed. The decimation ratio (Dratio) and number of Ksamples are entered here. The Nyquist frequency is displayed here as: F NYQUIST Figure 16. Decimated (Averaging) Screen Rev Page EVAL-AD768x/AD769x/AD794xCB F = SAMPLE RATIO ...

Page 18

... EVAL-AD768x/AD769x/AD794xCB The term AD768x/AD769x/AD794x is used in this document to represent all the ADCs listed in the ordering guide. ORDERING GUIDE Evaluation Board Model EVAL-AD7683CB EVAL-AD7684CB EVAL-AD7685CB EVAL-AD7686CB EVAL-AD7687CB EVAL-AD7688CB EVAL-AD7690CB EVAL-AD7691CB EVAL-AD7693CB EVAL-AD7694CB EVAL-AD7942CB EVAL-AD7946CB EVAL-CONTROL BRD2 EVAL-CONTROL BRD3 ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection ...

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