AD7714YN datasheet(35/40 Pages) AD

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AD7714

REV. C

–35–

CLOCK

GENERATION

AUTO-ZEROED

MODULATOR

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

THERMOCOUPLE

JUNCTION

+5V

+VIN

A = 1–128

AGND

PGA

Figure 13. Thermocouple Measurement Using the AD7714

Temperature Measurement

Another application area for the AD7714 is in temperature

measurement. Figure 13 outlines a connection from a thermo-

couple to the AD7714. In this application, the AD7714 is oper-

ated in its buffered mode to allow large decoupling capacitors

on the front end to eliminate any noise pickup which there may

have been in the thermocouple leads. When the AD7714 is

operated in buffered mode, it has a reduced common-mode

range. In order to place the differential voltage from the thermo-

couple on a suitable common-mode voltage, the AIN2 input of

the AD7714 is biased up at the reference voltage, +2.5 V.

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