INA111: INA111 Offset

user1666337

Part Number: INA111

Hallo,

i want to juse the INA111 with Gain of 1, 10, 100 and 1000. The Datasheet says that the Offset RTI is 100uV + 500uV/G.

I mean with Gain z.b. 1000 the Offest may be 100 + 500/1000 similar 100.5 uV. In my case I measure with both Inputs shorten to ground

Gain 1 0,3mV

Gain 10 1,9mV

Gain 100 19mV

Gain 1000 190 mV

Is this correct ? Or what is wrong

0 Raymond Zhang1 over 5 years ago

Can you share the complete testing schematic with us? It does not sound right.

Enclosed is the Tina schematic. Please modified it per your test configuration.

Best,

Raymond

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi,

why do you think it is wrong? RTI means "referred to input". So, you still need to multiply the input offset voltage with the gain.

Kai

0 user1666337 over 5 years ago in reply to kai klaas69

okay that was my mistake. It is the same probleme as other OP Amp.

Offest ist depending on gain.

Thanks

0 kai klaas69 over 5 years ago in reply to user1666337

Guru 140200 points

You are welcome :-)

Kai

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