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ADVANCED COMMUNICATIONS & SENSING
Noise Density (referred to the input) – the input noise density V
previousely computed in the software with OSR, N
ENOB DC – Effective Number Of Bits (or Effective Bits)
noise value. This value is a DC ENOB measure, not the dynamic ENOB that is measured using FFT and
SINAD. Its equation is as follows:
NFR – the Noise Free Code Resolution (or flicker-free resolution) is the number of bits of resolution beyond
which it is impossible to distinctly resolve individual codes. Multiplying by a factor of 6.6 converts the
samples rms noise into a useful measure of peak-to-peak noise:
1.Digital averaging increases resolution and reduces noise. The effects of input-referred noise is reduced by digital averaging on the
buffer of samples used to compute the Measured System Performances. Therefore, the ENOB DC value can be higher than the sample
width limitation (>16 bits).
ACS - Revision 1.0
© Semtech Corp.
--------------------------------- -
V
=
,
ND IN
samplerate
ENOB
=
16 Log
NFR
=
16 Log
–
May 2011
Evaluation Kit for SX8724S Data Acquisition System
ND,IN
and fs parameters:
ELCONV
V
Vrms
,
N IN
------------ -
Hz
1
– is computed according to the
σ ( )
[
–
bits
2
(
σ 6.6
⋅
)
[
bits
2
Page 33
SX8724SEVK
USER GUIDE
is computed according to sample rate
σ
]
]
www.semtech.com
samples rms
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