EVAL-AD7797EBZ Analog Devices Inc, EVAL-AD7797EBZ Datasheet

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EVAL-AD7797EBZ

Manufacturer Part Number
EVAL-AD7797EBZ
Description
BOARD EVALUATION FOR AD7797
Manufacturer
Analog Devices Inc
Datasheets

Specifications of EVAL-AD7797EBZ

Number Of Adc's
1
Number Of Bits
24
Sampling Rate (per Second)
123
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
±VREF/128
Power (typ) @ Conditions
1.6mW @ 123SPS
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7797
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
Full-featured evaluation board for the AD7797
Standalone USB interface
Various linking options
PC software for control of AD7797
GENERAL DESCRIPTION
This data sheet describes the evaluation board for the
AD7797, a low power, 24-bit sigma-delta (Σ-Δ) ADC. The
AD7797 is a complete analog front end for low frequency
measurement applications, such as bridge sensor systems.
It contains one differential input and includes a low noise
instrumentation amplifier. The update rate can be varied
from 4.17 Hz to 123 Hz.
The AD7797 also has an on-board clock, eliminating the need
for an external clock. It employs a Σ-Δ conversion technique
to realize up to 24 bits of no missing codes performance. The
input signal is applied to an analog modulator. The modulator
output is processed by an on-chip digital filter. The analog input
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. 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. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
ANALOG
INPUTS
TEMPERATURE
SENSOR
Low Power Sigma-Delta ADC for Bridge Sensors
FUNCTIONAL BLOCK DIAGRAM
AD7797
AVDD
Evaluation Board for the AD7797 24-Bit,
REGULATOR
INTERFACE
VOLTAGE
SPI/USB
Figure 1.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
channel of the AD7797 accepts analog input signals of
±V
the rms noise is 65 nV. Simultaneous 50 Hz/60 Hz rejection
is available at an update rate of 16.7 Hz.
Full details on the AD7797 are available in the AD7797 data
sheet, available from Analog Devices, Inc., which should be
consulted in conjunction with this data sheet when using the
evaluation board.
The evaluation board interfaces to the USB port of an IBM-
compatible PC. Software is available with the evaluation board,
which allows the user to communicate easily with the AD7797.
Note that the AD7797 evaluation board software must be installed
before connecting the AD7797 evaluation board to the PC.
Other components on the AD7797 evaluation board include
the
regulator used to power the USB/SPI interface.
CONNECTOR
REF
ADP3303
USB
/128. With the update rate programmed to 4.17 Hz,
high precision, low power, 3.3 V output voltage
SOFTWARE
LabVIEW™
PC AND
BASED
©2008 Analog Devices, Inc. All rights reserved.
EVAL-AD7797
www.analog.com

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EVAL-AD7797EBZ Summary of contents

Page 1

... Rev. 0 Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards ...

Page 2

... General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Evaluation Board Hardware ............................................................ 3 Power Supplies .............................................................................. 3 Links ............................................................................................... 3 Setting Up the Evaluation Board ................................................ 3 Sockets ........................................................................................... 3 Interfacing to the Evaluation Board ........................................... 4 Evaluation Board Software .............................................................. 5 REVISION HISTORY 7/08—Revision 0: Initial Version Software Description ....................................................................5 Installing the Software ..................................................................5 Using the Software ........................................................................5 Main Window Options .................................................................6 Registers ...

Page 3

... This socket is used in conjunction with the prototype area to interface any signal to the AD7797. SETTING UP THE EVALUATION BOARD Care should be taken before applying power and signals to the evaluation board to ensure that all link positions are set per the required operating mode. Table 2 shows the position in which all the links are initially set. ...

Page 4

... EVAL-AD7797 INTERFACING TO THE EVALUATION BOARD Interfacing to the evaluation board is via a standard USB con- nector, J1 used to connect the evaluation board to the USB port of a PC. A standard USB connector cable is included with the AD7797 evaluation board to allow the evaluation board to interface with the USB port of the PC. Because the board ...

Page 5

... EVALUATION BOARD SOFTWARE SOFTWARE DESCRIPTION The AD7797 evaluation board is shipped with a CD-ROM containing software that can be installed onto a standard PC to control the AD7797. The software uses the USB of the PC to communicate with the AD7797, via the cable that accompanies the board. ...

Page 6

... EVAL-AD7797 MAIN WINDOW OPTIONS Menu Bar File. Allows you to read previously stored data for display or analysis, writes the current set of data to a file for later use, and exits the program. About. Provides information on the revision of software being used. Buttons Reset. Allows you to reset the ...

Page 7

... To access the configuration register and the mode register, click Registers (see Figure 4). This window allows you to change the update rate, the polarity, and the clock source, among other options. Consult the the bit functions. Figure 4. AD7797 Evaluation Software Registers Window Rev Page EVAL-AD7797 AD7797 data sheet for further details on ...

Page 8

... ID register, the full-scale calibration register, and the status register. To write to the offset calibration and full- scale calibration registers, you must place the down or idle mode using the Mode box in the Registers window (see Figure 4). Figure 5. AD7797 Evaluation Software Other Registers Window Rev Page AD7797 in power- ...

Page 9

... EVALUATION BOARD SCHEMATIC AND ARTWORK Figure 6. AD7797 Evaluation Board Schematic Rev Page EVAL-AD7797 07581-006 ...

Page 10

... EVAL-AD7797 Figure 7. AD7797 Evaluation Board Component Side Artwork Figure 8. AD7797 Evaluation Board Solder Side Artwork Rev Page ...

Page 11

... Figure 9. AD7797 Evaluation Board Component Layout Diagram Rev Page EVAL-AD7797 ...

Page 12

... Connectors 5 AIN+, AIN−, REFIN+, REFIN−, CLK ORDERING GUIDE Model Description EVAL-AD7797EBZ 1 Evaluation Board RoHS Compliant Part. ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB07581-0-7/08(0) Description Manufacturer/Part No. AD7797BRUZ Analog Devices ...

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