2

f1

2

f6

2

f2

10

‡

A

A

+

+

A

log

THD = 20

ADC78H90

SNAS227D – NOVEMBER 2003 – REVISED MARCH 2013

www.ti.com

including harmonics but excluding d.c.

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, excluding d.c.

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

•

•

(1)

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

acquisition time plus the conversion time. In the case of the ADC78H90, this is 16 SCLK periods.

8

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