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INA126: Single supply INA126 problem.

Part Number: INA126
Other Parts Discussed in Thread: INA128, INA129

Hello I'm Jo from south korea.

I'm not good at English, so I appreciate it if you understand me.

I'd like to make ECG module with INA126 and Arduino Uno.

Arduino Uno can provide only single supply as zero to 5V.

So I wanted signal that swings 2.5V.

Before I make module, I tried to test INA126.

When I tried to test with dual supply, It worked well as I expected.

But with single supply, It didn't work.

The input was +/-100mV 1Hz sine wave, but I can't understand why the result was like that.

Q. Could you explain the reason why? and if the schematic is not proper for module, can I get some schematics related single supply?

Thanks for your time.