2

1

f

2

6

f

2

2

f

10

‡

A

A

+

+

A

log

20

=

THD

ADC121S705

SNAS355B – DECEMBER 2006 – REVISED MARCH 2013

www.ti.com

SPURIOUS FREE DYNAMIC RANGE (SFDR) is the difference, expressed in dB, between the desired signal

amplitude to the amplitude of the peak spurious spectral component, where a spurious spectral component is

any signal present in the output spectrum that is not present at the input and may or may not be a harmonic.

TOTAL HARMONIC DISTORTION (THD) is the ratio 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, expressed in dB. THD is calculated as

(4)

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.

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

8

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