Datasheet

2
f1
2
Fn
2
f2
10
x
A
A++A
logTHD = 20
/
ADC101C021, ADC101C027
www.ti.com SNAS446D –FEBRUARY 2008–REVISED FEBRUARY 2013
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, expressed in dBc, of the rms total of the first n harmonic
components at the output to the rms level of the input signal frequency as seen at the output. THD is calculated
as
(1)
where A
f1
is the RMS power of the input frequency at the output and A
f2
through A
fn
are the RMS power in the
first n harmonic frequencies.
THROUGHPUT TIME is the minimum time required between the start of two successive conversions. It is the
acquisition time plus the conversion time.
LEAST SIGNIFICANT BIT (LSB) is the bit that has the smallest value or weight of all bits in a word. This value is
LSB = V
A
/ 2
n
(2)
where V
A
is the supply voltage for this product, and "n" is the resolution in bits, which is 10 for the ADC101C021.
MOST SIGNIFICANT BIT (MSB) is the bit that has the largest value or weight of all bits in a word. Its value is
1/2 of V
A
.
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