Datasheet

2
f1
2
f6
2
f2
10
‡
A
A++A
logTHD = 20
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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
• A
f1
is the RMS power of the input frequency at the output
• A
f2
through A
f6
are the RMS power in the first 5 harmonic frequencies (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.
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