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OPA2376 as differential amp for current sensing

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Hi!

I've used the OPA2376 in a small test product. A currently unused feature is to measure a uncritical given USB current (0 - 3A) by using a shunt resistor of 10mOhm.

The goal was to have an OP output from 0 - 256mV which goes into an ADC with an internal gain of 8 to meet the 2048mV ref voltage -> 0 - 3,2A represents 0 - 2048mV

I've build up 100 PCBs, and I've observed @ 40 - 50% of these some issues with the output voltage of the OPA2376.

I used a gain of ~8,6 with 0603 1% resistors and a buffer + small low pass filter @ the output.

Is there any issue with the low gain or low voltage output of this IC? The OPA is also powered by "USB_5V_IN" voltage (+100nF bypass).

Many thanks in advance and best regards!


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