EVAL-AD7796EBZ Analog Devices Inc, EVAL-AD7796EBZ Datasheet

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EVAL-AD7796EBZ

Manufacturer Part Number
EVAL-AD7796EBZ
Description
BOARD EVALUATION FOR AD7796
Manufacturer
Analog Devices Inc
Datasheets

Specifications of EVAL-AD7796EBZ

Number Of Adc's
1
Number Of Bits
16
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
AD7796
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
Full-featured evaluation board for the AD7796
Standalone USB interface
Various linking options
PC software for control of AD7796
GENERAL DESCRIPTION
This data sheet describes the evaluation board for the AD7796,
a low power, 16-bit sigma-delta (Σ-Δ) ADC. The AD7796 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 AD7796 also has an on-board clock, eliminating the need
for an external clock. It employs a Σ-Δ conversion technique to
realize up to 16 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. A
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
AD7796
AVDD
Evaluation Board for the AD7796 16-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 AD7796 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 AD7796 are available in the AD7796 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 AD7796.
Note that the AD7796 evaluation board software must be installed
before connecting the AD7796 evaluation board to the PC.
Other components on the AD7796 evaluation board include
the
regulator used to power the USB/SPI interface.
CONNECTOR
REF
ADP3303
/128. With the update rate programmed to 4.17 Hz,
USB
high precision, low power, 3.3 V output voltage
SOFTWARE
LabVIEW™
PC AND
BASED
©2008 Analog Devices, Inc. All rights reserved.
EVAL-AD7796
www.analog.com

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EVAL-AD7796EBZ Summary of contents

Page 1

... Rev. A 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

... 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—Rev Rev. A Changes to Using the Software Section ......................................... 5 4/08—Revision 0: Initial Version Software Description ....................................................................5 Installing the Software ..................................................................5 Using the Software ...

Page 3

... This socket is used in conjunction with the prototype area to interface any signal to the AD7796. 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

... When installation of the AD7796 evaluation board soft- ware is complete, use the supplied USB connector cable to connect the board to the PC via J1 on the AD7796 evaluation board and the USB port on the PC. The PC automatically detects the new USB device and identifies it as AD779x Evaluation Board ...

Page 5

... EVALUATION BOARD SOFTWARE SOFTWARE DESCRIPTION The AD7796 evaluation board is shipped with a CD-ROM containing software that can be installed onto a standard PC to control the AD7796. The software uses the USB of the PC to communicate with the AD7796, via the cable that accompanies the board. ...

Page 6

... EVAL-AD7796 MAIN WINDOW OPTIONS Menu Bar File. Allows you to read previously stored data for display or analysis, write the current set of data to a file for later use, and exit the program. About. Provides information on the revision of software being used. Buttons Reset. Allows you to reset the AD7796 and set the registers to the power-up conditions as specified by the software (channel = AIN(− ...

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. AD7796 Evaluation Software Registers Window Rev Page EVAL-AD7796 AD7796 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 power-down or idle mode using the Mode box in the Registers window (see Figure 4). Figure 5. AD7796 Evaluation Software Other Registers Window Rev Page AD7796 in ...

Page 9

... EVALUATION BOARD SCHEMATIC AND ARTWORK Figure 6. AD7796 Evaluation Board Schematic Rev Page EVAL-AD7796 07433-006 ...

Page 10

... EVAL-AD7796 Figure 7. AD7796 Evaluation Board Component Side Artwork Figure 8. AD7796 Evaluation Board Solder Side Artwork Rev Page ...

Page 11

... Figure 9. AD7796 Evaluation Board Component Layout Diagram Rev Page EVAL-AD7796 ...

Page 12

... AIN+, AIN−, REFIN+, REFIN−, CLK ORDERING GUIDE Model Description 1 EVAL-AD7796EBZ Evaluation Board RoHS Compliant Part. ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Description AD7796BRUZ USB controller 24LC64 ADP3303ARZ-3.3 24 MHz crystal ...

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