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AD7927 数据表(PDF) 9 Page - Analog Devices

部件名 AD7927
功能描述  8-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 20-Lead TSSOP
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7927 数据表(HTML) 9 Page - Analog Devices

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Data Sheet
AD7927
Rev. D | Page 9 of 28
Signal-to-(Noise + Distortion) Ratio (SINAD)
This is the measured ratio of signal-to-(noise + distortion) at
the output of the ADC. The signal is the rms amplitude of the
fundamental. Noise is the sum of all nonfundamental signals
up to half the sampling frequency (fS/2), excluding dc. The ratio
is dependent on the number of quantization levels in the digiti-
zation process; the more levels, the smaller the quantization
noise. The theoretical signal-to-(noise + distortion) ratio for
an ideal N-bit converter with a sine wave input is given by
Signal-to-(Noise + Distortion) = (6.02N + 1.76)dB
Thus, for a 12-bit converter, this is 74 dB. Figure 5 shows the
signal-to-(noise + distortion) ratio performance vs. input fre-
quency for various supply voltages while sampling at 200 kSPS
with an SCLK of 20 MHz.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of harmonics to the
fundamental. For the AD7927, it is defined as:
1
2
6
2
5
2
4
2
3
2
2
log
20
)
dB
(
V
V
V
V
V
V
THD
where:
V1 is the rms amplitude of the fundamental.
V2, V3, V4, V5, and V6 are the rms amplitudes of the second
through the sixth harmonics.
Figure 7 shows a graph of total harmonic distortion vs. analog
input frequency for various supply voltages, and Figure 8 shows
a graph of total harmonic distortion vs. analog input frequency
for various source impedances (see the Analog Input section).


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