参数资料
型号: SX8724E082TDT
厂商: Semtech
文件页数: 40/53页
文件大小: 0K
描述: IC DAS PRESS/TEMP SENS 16MLPQ
标准包装: 1
系列: ZoomingADC™
类型: 数据采集系统(DAS)
输入类型: 差分
输出类型: 数字
接口: I²C
安装类型: 表面贴装
封装/外壳: 16-VQFN 裸露焊盘
供应商设备封装: 16-MLPQ(4x4)
包装: 标准包装
产品目录页面: 585 (CN2011-ZH PDF)
其它名称: SX8724E082TDTDKR
ADVANCED COMMUNICATIONS & SENSING
V1.23 2009 Semtech Corp.
www.semtech.com
45
SX8724
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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