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Evaluation Board User Guide
UG-257
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluation Board for the AD7195, 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 20
FEATURES
Full featured evaluation board for the AD7195
Standalone interface using microcontroller and LCD display
PC software for control of AD7195 using USB interface
Various linking options
INTRODUCTION
This user guide describes the evaluation board for the AD7195,
which is a 4.8 kHz, ultralow noise, 24-bit sigma-delta (Σ-Δ) ADC.
The AD7195 is a complete analog front end for low frequency
measurement applications. It contains two differential inputs/
four pseudodifferential inputs and includes a low noise
instrumentation amplifier, a reference detect, and a low-side
power switch.
Full data on the AD7195 is available in the AD7195 data sheet
available from Analog Devices, Inc., and should be consulted
in conjunction with this user guide when using the evaluation
board.
GENERAL DESCRIPTION
The AD7195 evaluation kit is a powerful tool for exploring and
evaluating the AD7195 features.
The evaluation board can be operated in complete standalone,
battery-powered mode. The LCD display is used to display the
conversion data.
When the board is connected to (and possibly powered from)
a PC via a standard USB interface, the PC software allows the
graphical display of real-time data, logs the data into a text file,
allows the user to modify the internal settings of the AD7195,
and generally helps in understanding the part features and
performance.
Finally, the flexible interface structure of the board allows it
to be connected in several useful configurations. For example,
the digital section of the evaluation board can be used indepen-
dently as a convenient digital interface for a user’s own sensor
design PCB or module containing the AD7195. Alternatively,
an external microcontroller can be interfaced to the AD7195
and, thus, the evaluation board can act as a complete analog
front end for creating and debugging software on the user’s
digital platform.
EVALUATION BOARD CONNECTION DIAGRAM
VOLTAGE
REFERENCE
ANALOG
INPUTS
SPI/USB
INTERFACE
REFIN
VOLTAGE
REGULATOR
VOLTAGE
REGULATOR
EXT
AD7195
BAT
MICRO
DRIVERS
LCD
NOISE TEST
CIRCUITRY
SENSOR
CONNECTOR
PC
AND
LabVIEW™
BASED
SOFTWARE
09727-001
Figure 1.
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