1 Features

• High common-mode voltage:

– 40 V at VS = 5 V

– ±100 V at VS = ±15 V

• Differential gain = 0.1 V/V TO 100 V/V:

– Set with External Resistors

• Low quiescent current: 570 μA

• Wide supply range:

– Single Supply: 4.5 V to 36 V

– Dual Supplies: ±2.25 V to ±18 V

• Low gain error: 0.025%

• High common-mode rejection: 80 dB

2 Applications

• Battery cell formation & test equipment

• AC drive control module

• HVAC controller

• Professional audio amplifier (rack mount)

• Programmable DC power source

• Data acquisition (DAQ)

3 Description

The INA146 is a precision difference amplifier that

can be used to accurately attenuate high differential

voltages and reject high common-mode voltages for

compatibility with common signal processing voltage

levels. High-voltage capability also affords inherent

input protection. The input common-mode range

extends beyond both supply rails, making the INA146

an excellent choice for both single and dual supply

applications.

On-chip precision resistors are laser-trimmed to

achieve accurate gain and high common-mode

rejection. Excellent TCR tracking of these resistors

provides continued high precision over temperature.

A 10:1 difference amplifier provides 0.1 V/V gain

when the output amplifier is used as a unity-gain

buffer. In this configuration, input voltages up to ±100

V can be measured. Gains greater than 0.1 V/V can

be set with an external resistor pair without affecting

the common-mode input range.

The INA146 is available in the SO-8 surfacemount

package specified for the extended industrial

temperature range, –40°C to 85°C.