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INA828: Offset too high.

Part Number: INA828
Other Parts Discussed in Thread: OPA4277

Hi,

I'm trying to use the INA828 as an input amplifier in a Thermal conductivity detector.

The inputs are to be connected to the corners of a wheatstone bridge driven by a current source.

The power supply to the device is +/- 15 volts.

The device is very close to the input connector.  I've got 47Kohm resistors from each input to ground for the bias current canceling. 

The gains that I am using are 3 to 24.

The problem that I am having on two different circuits is that i am seeing between .325 and .350 volts of offset when the input differential is zero volts.

Thanks in advanced.

Jim Gale

Wasson-ECE Instrumentation, Inc.