Datasheet

2
1f
2
6f
2
2f
10
‡
A
A++A
log20=THD
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ADC122S051
www.ti.com SNAS257E –NOVEMBER 2004–REVISED MARCH 2013
TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB or dBc, of the rms total of the first five
harmonic components at the output to the rms level of the input signal frequency as seen at the output. THD is
calculated as
(2)
where A
f1
is the RMS power of the input frequency at the output and A
f2
through A
f6
are the RMS power in the
first 5 harmonic frequencies. Accurate THD measurement requires a spectrally pure sine wave (monotone) at the
ADC input.
THROUGHPUT TIME is the minimum time required between the start of two successive conversion. It is the
acquisition time plus the conversion and read out times. In the case of the ADC122S051/ADC122S051Q, this is
16 SCLK periods.
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