參數(shù)資料
型號(hào)： SX8723E083TDT
元件分類： ADC
英文描述： 5-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO12
封裝： 4 X 4 MM, ROHS COMPLIANT, MLPD-12
文件頁數(shù)： 40/53頁
文件大小： 3978K
代理商： SX8723E083TDT
ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
45
SX8723
ZoomingADC for Pressure and Temperature Sensing
Figure 24 - ADC Noise (PGA1, 2 & 3 Bypassed, OSR = 512, NELCONV = 2)
Figure 25 - Simple Noise Model for PGAs and ADC
Figure 26 - Total Input Referred Noise
As an example, consider the system where: GD2 = 10 (GD1 = 1; PGA3 bypassed), OSR = 512, NELCONV = 2,
VREF = 5 V. In this case, the noise contribution VN1 of PGA1 is dominant over that of PGA2. Using Equation 25,
we get: VN,IN = 6.4 V (rms) at the input of the acquisition chain, or, equivalently, 0.85 LSB at the output of the
ADC. Considering 0.2 V (rms) maximum signal amplitude, the signal-to-noise ratio is 90dB.
Noise can also be reduced by implementing a software filter. By making an average on a number of subsequent
measurements, the apparent noise is reduced the square root of the number of measurement used to make the
average.
0
20
40
60
80
-5
-4
-3
-2
-1
0
1
2
3
4
5
Output Code Deviation From Mean Value [LSB]
O
c
u
re
n
c
e
s
[%
o
f
to
ta
l
s
a
m
p
le
s
]
GD1
GD2
GD3
ADC
f
s
V
N1
V
N2
V
N3
PGA1
PGA2
PGA3
GD1
GD2
GD3
ADC
f
s
V
N1
V
N2
V
N3
PGA1
PGA2
PGA3
V
N,IN
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