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ADS124S08EVM: enob and the noise-free bit

Part Number: ADS124S08EVM


Hi team

i have something need to know because i support the medical customer and they are very interested in signal-chain

Q1: for the adc we can use the over sample and the average to improve the SNR, but if I don't do anything just like the oversample and average ,is the ENOB equals to 6.02N+1.76 ? and this ENOB need the input signal approach the FS input ? 

Q2: How can i connect the ENOB to Noise free bit? 

Q3: The DR of adc is standing for the input signal/ the max spur signal?