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Hi, I have half of an LMP7702 configured as a unity-gain buffer amp. When the input signal gets to about -1.5 V, the output clips. An LMP7701 in the same circuit has a 20-kohm feedback resistor, and its output clips at -0.75 V. Supply voltages are ±6 V, and we see no dips on the negative supply pin when the clipping occurs. The load on each op amp is 20 kohms (with only trace capacitance). I replaced the LMP7701 but saw the same behavior. Any ideas? Thanks.
Chris,
I believe you have a short or something close to it (~10ohm) at the output that pushes LMP7701 into a short-circuit conditions - see below.
Thanks, everyone. The cause of the clipping turned out to be a defective/damaged analog switch on the output of the op amp. It was the last thing we checked...