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www.analog.com
tion of 16 bits or 24 bits. However, the effective number
tive resolution. Analog Devices speci es peak-to-peak
rms
rms noise.
the analog input range decreases. However, since the
full-scale analog input signal is also being reduced, the
the number of icker-free bits is important. The digital
word from the ADC can then be truncated so that the
ickering bits are not seen on the weigh-scale monitor.
NUMBER OF OCCURRENCES
RMS NOIS
E
P-P INPUT NOISE = 6.6 RMS NOISE
OUTPUT CODE
n–4n–3n–2n–1nn+1n+2n+3n+4
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–
tered trademarks are the property of their respective companies.
to-noise ratio equals
= 20log
Analog Devices normally speci es the peak-to-peak
rms noise. From the signal-to-noise calculation, the
+ 1.76 = 20log
V when the analog input range is
1.25
–6)/(2.56
2)) = –115.85
+ 1.76 =>
= (115.85 – 1.76)/6.02 = 19
icker in the 19 MSBs.
–6)/(2.56
2)) = – 132.25
132.25 = 6.02
+ 1.76 =>
= (132.25 – 1.76)/6.02 = 21.7
value that is greater than the peak-to-peak resolution by
the amount of bits that icker. The peak-to-peak resolu-
tion gives a better indication of performance since it
from company to company. Therefore, when comparing
than parts that are speci ed using effective resolution.
that has an effective resolution of 22 bits has a icker-free
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