參數(shù)資料
型號: XE8000EV121
廠商: Semtech
文件頁數(shù): 41/53頁
文件大小: 0K
描述: BOARD EVAL FOR SX8723/24
標準包裝: 1
主要目的: 接口,傳感器至模數(shù)轉(zhuǎn)換器接口,可編程
嵌入式:
已用 IC / 零件: SX8723,SX8724,SX8725
主要屬性: 用于橋型傳感器的信號調(diào)節(jié)
次要屬性: GUI,最多 16 位,1/12 ~ 1000 可編程增益,I2C 接口
已供物品: 板,CD
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
相關產(chǎn)品: SX8725E083DKR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082DKR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083CT-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082CT-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083TR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082TR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
ADVANCED COMMUNICATIONS & SENSING
V1.23 2009 Semtech Corp.
www.semtech.com
46
SX8724
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
相關PDF資料
PDF描述
NR4012T330M INDUCTOR 33UH 20% SMD
NR4012T4R7N INDUCTOR WOUND 4.7UH 960MA SMD
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NR4012T470M INDUCTOR 47UH 20% SMD
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