参数资料
型号: SX8723CWLTDT
厂商: Semtech
文件页数: 52/67页
文件大小: 0K
描述: IC DAS ADC 16BIT I2C/SRL
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: 12-WFDFN 裸露焊盘
供应商设备封装: 12-MLPD-EP(4x4)
包装: 标准包装
其它名称: SX8723CWLTDTDKR
www.semtech.com/products/
Page 56
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8723C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
As shown in Equation 28, noise can be reduced by increasing OSR and NELCONV (increases the ADC averaging effect,
but reduces noise).
Figure 47 shows the distribution for the ADC alone (PGA1, 2, and 3 bypassed). Quantization noise is dominant in this
case, and, thus, the ADC thermal noise is below 16 bits.
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 28, page 55, we get: VN,IN
= 6.4 μV (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.
Table 39. PGA Noise Measurement (n = 16bits, OSR = 512, NELCONV = 2, VREF = 5V)
Parameter
PGA1
PGA2
PGA3
Output RMS noise(uV)
VN1 = 205
VN2 = 340
VN3 = 365
Figure 47. ADC Noise (PGA1, 2 & 3 Bypassed, OSR = 512, NELCONV = 2)
Figure 48. Total Input Referred Noise
0
20
40
60
80
-5
-4
-3
-2
-1
0
1
2
3
4
5
Output Code Deviation From Mean Value [LSB]
Oc
cu
ren
ces
[%
o
f
to
tal
sam
p
les
]
PGA1
PGA2
PGA3
ADC
±Vin
±Voff
±Vref
Analog
Inputs
Reference
Inputs
VIN,ADC
VREF,ADC
VSS
VREF
AC2
AC3
AC4
AC5
N.C.
VSS
VBATT
VSS
VREF
S
VN,IN
VIN
Not
Recommended
for
New
Designs
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