5962-0924001VXC Datasheet, PDF (42/46 Pages) Texas Instruments – 12-Bit, 1-GSPS Analog-to-Digital Converter

ADS5400-SP
SLAS669C – SEPTEMBER 2010 – REVISED AUGUST 2012
www.ti.com
Signal-to-Noise and Distortion (SINAD)
SINAD is the ratio of the power of the fundamental (P_S) to the power of all the other spectral components
including noise (P_N) and distortion (P_D), but excluding dc.
SINAD
+
10log₁₀
P_S
P_N ) P_D
(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 T_MIN or T_MAX. It is computed as the maximum variation the parameters over the whole
temperature range divided by T_MIN – T_MAX.
Total Harmonic Distortion (THD)
THD is the ratio of the power of the fundamental (P_S) to the power of the first five harmonics (P_D).
THD
+ 10log₁₀
P_S
P_D
(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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