2

1

f

2

6

f

2

2

f

10

‡

A

A

+

+

A

log

20

=

THD

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)

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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