2

f1

2

f6

2

f2

10

‡

A

A

+

+

A

log

THD = 20

ADC108S022

SNAS338F – SEPTEMBER 2005 – REVISED MARCH 2013

www.ti.com

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

input signal and the peak spurious signal where a spurious signal is any signal present in the output

spectrum that is not present at the input, including harmonics but excluding d.c.

TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in 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

•

•

(2)

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

acquisition time plus the conversion and read out times. In the case of the ADC108S022, this is 16 SCLK

periods.

8

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