參數(shù)資料
型號(hào)： SX8722I070TRLF
廠商： Semtech
文件頁數(shù)： 80/108頁
文件大?。?/td> 0K
描述： IC ZOOMING ADC 10BIT 16CH 44MLPQ
標(biāo)準(zhǔn)包裝： 1
類型： 壓力傳感器
輸入類型： 邏輯
輸出類型： 邏輯
接口： I²C
電流 - 電源： 300µA
安裝類型： 表面貼裝
封裝/外殼： 44-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 44-MLPQ（7x7）
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
配用： XE8000EV120-ND - BOARD EVAL FOR SX8722I070TRLF
其它名稱： SX8722I070LFDKR
ACS - Revision 4.2
October 2008
2008 Semtech Corp.
www.semtech.com
Page 73
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
Figure 38. Simple Noise Model for PGAs and ADC
Figure 39. 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 24, 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 the additional average filters implemented in the Measurement Engine. These filters are
described in section 11.4 Filtering. 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.
12.16. Gain Error and Offset Error
Gain error is defined as the amount of deviation between the ideal transfer function (theoretical Equation 18) and the
measured transfer function (with the offset error removed).
The actual gain of the different stages can vary depending on the fabrication tolerances of the different elements. Although
these tolerances are specified to a maximum of +/-3%, they will be most of the time around 0.5%. Moreover, the tolerances
between the different stages are not correlated and the probability to get the maximal error in the same direction in all stages
is very low. Finally, these gain errors can be calibrated by the software at the same time with the gain errors of the sensor for
instance.
Figure 40 shows gain error drift vs. temperature for different PGA gains. The curves are expressed in % of Full-Scale Range
(FSR) normalized to 25°C.
GD1
GD2
GD3
ADC
fs
VN1
VN2
VN3
PGA1
PGA2
PGA3
GD1
GD2
GD3
ADC
fs
VN1
VN2
VN3
PGA1
PGA2
PGA3
VN,IN
Not
Recommended
for
New
Designs
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