AD7714YN datasheet(37/40 Pages) AD

37 / 40 page

AD7714

REV. C

–37–

Data Acquisition

The AD7714 with its three differential channels (or five pseudo-

differential channels) is suited to low bandwidth, high resolution

data acquisition systems. In addition, the three-wire digital

interface allows this data acquisition front end to be isolated

with just three optoisolators. The entire system can be operated

from a single +3 V or +5 V supply provided that the input sig-

nals to the AD7714’s analog inputs are all of positive polarity.

The low power operation of the AD7714 ensures that very little

power has to be brought across the isolation barrier. Figure 15

shows the AD7714 in an isolated data acquisition system.

CLOCK

GENERATION

CHARGE BALANCING A/D

CONVERTER

DIGITAL

FILTER

AVDD

1 A

BUFFER

AVDD

SERIAL INTERFACE

STANDBY

SYNC

MCLK IN

MCLK OUT

1 A

REF IN (+)

REF IN (–)

AGND

DGND

BUFFER

DOUT

DIN

SCLK

POL

DRDY

RESET

DVDD

AD7714

DVDD

GND

+5V

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

VOUT

AD780

+5V

+VIN

A = 1–128

AGND

IN1+

IN1–

IN2+

IN2–

IN3+

IN3–

MICROCONTROLLER

OPTO-ISOLATORS

PGA

AUTO-ZEROED

MODULATOR

Figure 15. Data Acquisition System Using the AD7714

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