ADS5400HFSSLASHEM datasheet(42/47 Pages) TI1

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THD + 10log10

SINAD + 10log10

N ) PD

ADS5400-SP

SLAS669D – SEPTEMBER 2010 – REVISED JANUARY 2014

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Signal-to-Noise and Distortion (SINAD)

SINAD is the ratio of the power of the fundamental (PS) to the power of all the other spectral components

including noise (PN) and distortion (PD), but excluding dc.

(5)

SINAD is either given in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the

reference, or dBFS (dB to full scale) when the power of the fundamental is extrapolated to the converter’s full-

scale range.

Temperature Drift

Temperature drift (with respect to gain error and offset error) specifies the change from the value at the nominal

temperature to the value at TMIN or TMAX. It is computed as the maximum variation the parameters over the whole

temperature range divided by TMIN – TMAX.

Total Harmonic Distortion (THD)

THD is the ratio of the power of the fundamental (PS) to the power of the first five harmonics (PD).

(6)

THD is typically given in units of dBc (dB to carrier).

Two-Tone Intermodulation Distortion (IMD3)

IMD3 is the ratio of the power of the fundamental (at frequencies f1, f2) to the power of the worst spectral

component at either frequency 2f1 – f2 or 2f2 – f1). IMD3 is given in units of either dBc (dB to carrier) when the

absolute power of the fundamental is used as the reference, or dBFS (dB to full scale) when the power of the

fundamental is extrapolated to the converter’s full-scale range.

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