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AMC3330EVM: Noise

Part Number: AMC3330EVM
Other Parts Discussed in Thread: AMC3330


I am testing then AMC3330EVM with the inputs INN & INP shorted and get quite a bit of output noise, approx 10mVrms on OUTP & OUTN.

Taking the spectrum, the main energy is at 620kHz:

The data sheet says output noise is 220uVrms at 100kHz BW.

Two questions:

1. Is this 620kHz content normal for the AMC3330?

2. Do I need to add more filtering to the EVM to achieve the 200uVrms? or how should noise be tested?

Thanks for any suggestions.