INA146 High-voltage, Programmable Gain Difference Amplifier

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)

INA146 Simplified Block Diagram

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 surface-

mount package specified for the extended industrial

temperature range, –40°C to 85°C.

Package Information

PART

NUMBER

PACKAGE(1)

SPECIFIED

TEMPERATURE

RANGE

PACKAGE

SIZE (2)

INA146

SOIC (8)

−40°C to 85°C

4.90 mm ×

6.00 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

INA146

SBOS109A – SEPTEMBER 1999 – REVISED NOVEMBER 2023

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.