www.semtech.com/products/ Page 50 ADVANCED COMMUNICATIONS & SENSING DATASHEET SX8723C ZoomingADC fo" />
參數(shù)資料
型號(hào): SX8723CWLTDT
廠商: Semtech
文件頁(yè)數(shù): 46/67頁(yè)
文件大小: 0K
描述: IC DAS ADC 16BIT I2C/SRL
標(biāo)準(zhǔn)包裝: 1
系列: ZoomingADC™
類型: 數(shù)據(jù)采集系統(tǒng)(DAS)
輸入類型: 差分
輸出類型: 數(shù)字
接口: I²C
安裝類型: 表面貼裝
封裝/外殼: 12-WFDFN 裸露焊盤
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: SX8723CWLTDTDKR
www.semtech.com/products/
Page 50
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8723C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
11.3 Linearity
11.3.1 Integral Non-Linearity
The different PGA stages have been designed to find the best compromise between the noise performance, the
integral non-linearity and the power consumption. To obtain this, the first stage has the best noise performance and
the third stage the best linearity performance. For large input signals (small PGA gains, i.e. up to about 50), the noise
added by the PGA is very small with respect to the input signal and the second and third stage of the PGA should be
used to get the best linearity. For small input signals (large gains, i.e. above 50), the noise level in the PGA is important
and the first stage of the PGA should be used.
The following figures show the Integral non linearity for different gain settings over the chip temperature range
Normaliz
e
d
Magnitude
[-]
Normaliz
e
d
Magnitude
[-]
Normalized Frequency - f x (OSR / fs) [-]
Norm
a
liz
ed
Magn
itude
[-
]
Norm
a
liz
ed
Magn
itude
[-
]
Normalized Frequency - f x (OSR / fs) [-]
Figure 28. Frequency Response. Normalized Magnitude vs. Frequency for Different NELCONV
0
0.2
0.4
0.6
0.8
1
1.2
00.5
11.5
2
2.5
33.5
4
Nelconv = 1
0
0.2
0.4
0.6
0.8
1
1.2
00.5
11.5
22.5
3
3.5
4
Nelconv = 2
0
0.2
0.4
0.6
0.8
1
1.2
00.5
11.5
22.5
3
3.5
4
Nelconv = 4
0
0.2
0.4
0.6
0.8
1
1.2
00.5
11.5
22.5
3
3.5
4
Nelconv = 8
Not
Recommended
for
New
Designs
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