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Hi, TI expert
There is a problem that the amplification rate is too different while the customer is using the LMC662AIM (OPAMP).
The test was conducted with 10 samples received a few years ago. Since the samples are old parts, I think there may be a problem with the part itself, but I wonder if the circuit configuration is wrong.
- When only LMC662AIM (OPAMP) is changed in the same amplifier circuit,
: 5 out of 10 are amplified well, 5 are not amplified.
: The amplification factor of the first stage of the circuit below varies greatly depending on the IC.
(When only the LMC662AIM is replaced, the amplification rate is different and the deviation is severe.)
Please check that there is no problem with the circuit configuration below.
What are the input and output voltages you're measuring? The LMC662 does not have rail-to-rail inputs and requires a headroom of 2.5 V to the positive supply.
The customer wants to amplify the voltage through the CT circuit.
A voltage of about 10mV comes out from the CT side, so I want the output to be about 3V or more.
Grady,
I would like to ask a few questions, and point out a few items to help with your circuit.
Best regards,
Art Kay