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Delta 35 Specifications Page 13

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AN217
Rev. 0.2 13
4. Delta-Sigma Noise Specifications
Delta-sigma converters make high-precision, high-resolution measurements of signals. Often, the measurement is
of a very small signal voltage; therefore, the noise performance is one of the most important specifications.
Figure 7. Histogram Analysis of Noise: Effective Noise vs. Noise-Free Resolution
Number of Samples
ADC Codes
"Bin" that has highest
number of samples
and is closest to input
signal
Other "bins" receive
samples due to noise
...
...
Histogram has a shape
that approximates a
Gaussian PDF (shown
as dashed line) due to
white noise mixed with
dc input signal voltage
0 2^N102410231022102110201019 1025 1026 1027 1028 1029
Number of Samples
Effective Noise: rms noise is
one standard deviation (sigma)
...
...
0 2^N
Noise-Free Resolution:
6.6*sigma for 99.9% of
all output codes
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