參數(shù)資料
型號(hào)： AS8501-ASOU
廠商： ams
文件頁(yè)數(shù)： 3/41頁(yè)
文件大?。?/td> 0K
描述： IC DATA ACQ 16-SOIC
特色產(chǎn)品： AS8501 High Precision Data Acquisition Ics
標(biāo)準(zhǔn)包裝： 46
類型： 數(shù)據(jù)采集系統(tǒng)（DAS）
輸入類型： 模擬，數(shù)字
輸出類型： 模擬，數(shù)字
接口： 串行
電流 - 電源： 5mA
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC
包裝： 管件
產(chǎn)品目錄頁(yè)面： 803 (CN2011-ZH PDF)
AS8501 - Data Sheet
austriamicrosystems
Revision 1.1, 04-April-06
www.austriamicrosystems.com
Page 10 of 40
7.2.1
Reference voltage
The ASSP contains a highly sophisticated precision reference voltage. Its typical temperature dependence is a slight parabola shaped curve and is
shown in figure 21. This reference voltage is used mainly for the internal AD-converter, but can also be used for external purposes if the impedance of
the external circuitry is high enough.
The absolute value and its temperature coefficient (TC) is given by the content of the TRR register. This opens the possibility to calibrate the reference
voltage to the optimum absolute value (i.e. 1.28 V) and the TC value to zero thus eliminating fully the production spread.
Writing into subregister TRIMBV of TRR changes the absolute value linearly by 5.1 mV per digit as shown in the following graph and described in full
detail in 7.5.7
Trimming the TC value is similarly done by writing into subregister TRIMBTC. Since the TC trimming is also changing the absolute value it is important
to trim the TC first and then the absolute value.
1,1 6
1,2 0
1,2 4
1,2 8
1,3 2
1,3 6
0
5
1 0
15
20
25
3 0
c onte n t of TR IM B V in bits
re
fer
enc
evo
lt
ag
ei
n
V
75 ° C
24 °C
1,12
1,14
1,16
1,18
1,20
1,22
1,24
1,26
10
30
50
70
90
110
resistan ce lo ad in kO h m
refer
ence
vol
tag
ei
n
V
m eas u rem en t
o p en lo o p va lu e
Figure 4: Reference voltage as function of resistance load
Figure 5: Reference voltage as function of temperature
ams
AG
Technical
content
still
valid
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