ADS5560EVM Datasheet, PDF (47/56 Pages) Texas Instruments – 16-BIT, 40/80 MSPS ADCs WITH DDR LVDS/CMOS OUTPUTS

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ADS5560
ADS5562
SLWS207A – MAY 2008 – REVISED MAY 2012
SNR 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.
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_N
P_s
)
P_D
(3)
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.
Effective Number of Bits (ENOB)
The ENOB is a measure of a converter’s performance as compared to the theoretical limit based on quantization
noise.
ENOB
+
SINAD *
6.02
1.76
(4)
Total Harmonic Distortion (THD)
THD is the ratio of the power of the fundamental (P_S) to the power of the first nine harmonics (P_D).
THD
+
10Log¹⁰
P_s
P_N
(5)
THD is typically given in units of dBc (dB to carrier).
Spurious-Free Dynamic Range (SFDR)
The ratio of the power of the fundamental to the highest other spectral component (either spur or harmonic).
SFDR is typically given in units of dBc (dB to carrier).
Two-Tone Intermodulation Distortion
IMD3 is the ratio of the power of the fundamental (at frequencies f1 and f2) to the power of the worst spectral
component at either frequency 2f1–f2 or 2f2–f1. IMD3 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.
Voltage Overload Recovery
The number of clock cycles taken to recover to less than 1% error for a 6-dB overload on the analog inputs.
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