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.