Other INA168s

––

INA168

V+

Digital I/O on the ADS7870 provides power to select

the desired INA168. Diodes prevent output current of

the on INA168 from flowing into the off INA168.

+5V

REF

OUT

BUF

IN

BUF

OUT

INA168

V+

Digital

I/O

REF

BUF

––

IN4148

MUX

PGIA

12-Bit A/D

Converter

Clock

R

Divider

L

Oscillator

ADS7870

Serial

I/O

17

INA138, INA168

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SBOS122E – DECEMBER 1999 – REVISED DECEMBER 2017

Product Folder Links: INA138 INA168

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Copyright © 1999–2017, Texas Instruments Incorporated

Typical Applications (continued)

8.2.6 Multiplexed Measurement Using Logic Signal for Power

Multiple loads can be measured as illustrated in Figure 18. In this configuration each INA1x8 device is powered

by the digital I/O from the ADS7870. Multiplexing is achieved by switching on or off each the desired I/O.

Figure 18. Multiplexed Measurement Using Logic Signal for Power