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ADC Resolution

An n-bit converter splits its reference into 2ⁿ steps, so one LSB = V_ref / 2ⁿ. The best signal-to-noise an ideal converter can manage is 6.02n + 1.76 dB — every extra bit buys about 6 dB.

Resolution (bits)

Reference voltage (V)

Input voltage (V)

Amplifier gain before ADC

Total counts

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LSB size

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Code at input

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Ideal SNR

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Resolution referred to input

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Ideal quantisation only. Real converters lose bits to noise and non-linearity — the datasheet ENOB is the honest number, and your reference accuracy caps everything.

A helper, not a substitute for engineering judgment. Verify against the governing standard.