www.semtech.com/products/ Page 56 ADVANCED COMMUNICATIONS & SENSING DATASHEET SX8725C ZoomingADC fo" />
參數(shù)資料
型號(hào): SX8725CWLTDT
廠商: Semtech
文件頁(yè)數(shù): 52/68頁(yè)
文件大?。?/td> 0K
描述: IC DAS ADC 16BIT I2C/SRL
標(biāo)準(zhǔn)包裝: 1
系列: ZoomingADC™
類(lèi)型: 數(shù)據(jù)采集系統(tǒng)(DAS)
輸入類(lèi)型: 差分
輸出類(lèi)型: 數(shù)字
接口: I²C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 12-WDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 12-MLPD-EP(4x4)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱(chēng): SX8725CWLTDTDKR
www.semtech.com/products/
Page 56
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
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
N.C.
VSS
VBATT
VSS
VREF
S
VN,IN
VIN
Not
Recommended
for
New
Designs
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