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AD8676 Strange behavior

Question asked by nobli on Nov 12, 2015
Latest reply on Nov 16, 2015 by nobli

Why wont pin 1 (the output) of my AD8676 drop below 1.68V with 0V input into a non-inverting amplifer with 3 gain?

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R51 and TP4 are disconnected so the circuit is open, so what you are left with is a non-inverting amplifier, gain 3, with a varying input using a 10K trimmer pot (R47). The sources varies between 0V and 5V.

Pin 7 (the output pin of the second opamp on the chip) belongs to an almost-identical circuit, different only by its slightly larger feedback resistor, and it is working fine.

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