ADC08060

SNAS120H – OCTOBER 2000 – REVISED MARCH 2013

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SIGNAL TO NOISE PLUS DISTORTION (S/(N+D) or SINAD) is the ratio, expressed in dB, of the rms value of

the input signal frequency at the output to the rms value of all of the other spectral components below half the

clock frequency, including harmonics but excluding d.c.

SPURIOUS FREE DYNAMIC RANGE (SFDR) is the difference, expressed in dB, between the rms values of the

input signal frequency at the output and the peak spurious signal, where a spurious signal is any signal present

in the output spectrum that is not present at the input.

TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB, of the total of the first nine harmonic

levels at the output to the level of the fundamental at the output. THD is calculated as

where

•

f1 is the RMS power of the fundamental (input) frequency

•

f2 through f10 is the power in the first 9 harmonics in the output spectrum

(3)

ZERO SCALE OFFSET ERROR is the error in the input voltage required to cause the first code transition. It is

defined as

VOFF = VZT − VRB

where

•

VZT is the first code transition input voltage

(4)

Timing Diagram

Figure 29. ADC08060 Timing Diagram

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