2

1

f

2

6

f

2

2

f

10

W

A

A

+

+

A

log

20

=

THD



ADC081S051

www.ti.com

SNAS309F – APRIL 2005 – REVISED JANUARY 2014

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

where

•

Af1 is the RMS power of the input frequency at the output and Af2 through Af6 are the RMS power in the first 5

harmonic frequencies.

(1)

THROUGHPUT TIME is the minimum time required between the start of two successive conversion. It is the

acquisition time plus the conversion time.

TOTAL UNADJUSTED ERROR is the worst deviation found from the ideal transfer function. As such, it is a

comprehensive specification which includes full scale error, linearity error, and offset error.

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