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Re: Millivolt amplifier for ADC input !!!
Actually there are many IC dedicated to battery monitor applications. You may find one that suits your needs.
For example:
**broken link removed**
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I agree with AdrianN. Just use VCVS. Set the gain at say, 10000, that's 80dB.
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Re: ADC7894 inputs...
Yes, just connect your input to Vin. And connect GND to your system ground. GND will always be 0V. I am assuming your input is single ended here.
If your input is differential, you can't use this part. The thing like Vin=+10V and GND=-10v should never happen...
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