High-Voltage, Programmable Gain Difference Amplifier

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

0.1V/V gain when the output amplifier is used as a unity-gain buffer. In this

configuration, input voltages up to ±100V can be measured. Gains greater than 0.1V/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.