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Darol Klawetter
I'm currently laying out a PCB, and I'm thinking that I don't need to shield my 16-bit ADC because it has a differential analog input with a CMRR of 80 dB. I'm wondering if the CMRR will desensitize the input to any expected EMI, which will be common mode because the E-field across the input pin spacing of 0.5mm should be predominantly uniform at expected frequencies. I don't expect any EMI to exceed -60 dBm so 80 dB of CMRR should bury the EMI into the ADC noise floor. Any thoughts? I suppose one problem could be the frequency-dependent degrading of CMRR, though the ADC datasheet doesn't provide an CMRR vs frequency data.
Darol Klawetter
Darol Klawetter