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What is the best way to introduce ADC adapter stage and not degrade the SNR ?

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hello

i have to integrate a ADC of 14 bits. because I have estimated the noise to 3mV for 24V of dynamic range (bipolar signal +/-12V). As you can imagine I couldn't connect it directly to my ADC and therefore I have to introduce an adaptation stage to adapt the voltage range to my ADC.

What is the best way to not to degrade the SNR ? a big attenuator ? (for example +/-5V bipolar input ADC) or a bigger dynamic ADC voltage range ?
 

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