參數(shù)資料
型號(hào)： SX8725E083TRT
廠商： Semtech
文件頁(yè)數(shù)： 41/53頁(yè)
文件大?。?/td> 0K
描述： IC DAS PRESSURE/TEMP SENS 12MLPD
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-WFDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 12-MLPD
包裝： 標(biāo)準(zhǔn)包裝
配用： XE8000EV121-ND - BOARD EVAL FOR SX8723/24
其它名稱： SX8725E083DKR
ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
46
SX8725
ZoomingADC for Pressure and Temperature Sensing
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 27 shows gain error drift vs. temperature for different PGA gains. The curves are expressed in % of Full-
Scale Range (FSR) normalized to 25°C.
Offset error is defined as the output code error for a zero volt input (ideally, output code = 0). The offset of the
ADC and the PGA1 stage are completely suppressed if NELCONV > 1.
The measured offset drift vs. temperature curves for different PGA gains are depicted in Figure 28. The output
offset error, expressed in LSB for 16-bit setting, is normalized to 25°C. Notice that if the ADC is us ed alone, the
output offset error is below
±1 LSB and has no drift.
NORMALIZED TO 25°C
Figure 27 - Gain Error vs. Temperature for Different PGA Gains
NORMALIZED TO 25°C
Figure 28 - Offset Error vs. Temperature for Different PGA Gains
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
-50
-25
0
25
50
75
100
Temperature [°C]
G
a
in
E
rr
o
r
[%
o
f
F
S
R
]
1
5
20
100
-40
-20
0
20
40
60
80
100
-50
-25
0
25
50
75
100
Temperature [°C]
O
u
tp
u
t
O
ff
s
e
t
E
rr
o
r
[L
S
B
]
1
5
20
100
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