AD12401SLASHKIT datasheet(14/28 Pages) AD

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AD12401

Rev. A | Page 14 of 28

Signal-to-Noise-and-Distortion (SINAD)

The ratio of the rms signal amplitude (set 1 dB below full scale)

to the rms value of the sum of all other spectral components,

including harmonics, but excluding dc and image spur.

Signal-to-Noise Ratio (SNR)

The ratio of the rms signal amplitude (set at 1 dB below full

scale) to the rms value of the sum of all other spectral compo-

nents, excluding the first five harmonics and dc.

Spurious-Free Dynamic Range (SFDR)

The ratio of the rms signal amplitude to the rms value of the

peak spurious spectral component, except the image spur. The

peak spurious component may or may not be a harmonic. It can

be reported in dBc (that is, degrades as signal level is lowered)

or dBFS (always related back to converter full-scale).

Total Noise

Calculated as

)

(

001

dBFS

Signal

SNR

NOISE

dBc

dBm

−

where:

Z is the input impedance.

FS is the full scale of the device for the frequency in question.

SNR is the value of the particular input level.

Signal is the signal level within the ADC reported in dB below

full scale. This value includes both thermal and quantization noise.

Two-Tone Intermodulation Distortion Rejection

The ratio of the rms value of either input tone to the rms value

of the worst third-order intermodulation product; reported in dBc.

Two-Tone SFDR

The ratio of the rms value of either input tone to the rms value

of the peak spurious component. The peak spurious component

may or may not be an IMD product. It can be reported in dBc

(that is, degrades as signal level is lowered) or in dBFS (always

related back to converter full-scale).

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