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INA126: INA126 output unstable at GAIN = 368

Part Number: INA126
Other Parts Discussed in Thread: OP27


I am using INA126 with the GAIN of 368 (RG = 220 Ohms). Input to the ref pin is about 6.5 VDC. My output oscillates withing 6 mv ! However, when I change my RG to say 500 Ohms (lesser GAIN), then output becomes stable like rock. Any idea what is the cause ? Thanks