參數(shù)資料
型號(hào)： DC586A
廠商： Linear Technology
文件頁(yè)數(shù)： 30/40頁(yè)
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2431
軟件下載： QuikEval System
設(shè)計(jì)資源： DC586A Design File
DC586A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 2
位數(shù)： 20
采樣率（每秒）： 7.5
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2431
已供物品： 板
相關(guān)產(chǎn)品： DC590B-ND - BOARD DEMO USB SERIAL CONTROLLER
LTC2431IMS#PBF-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431CMS#TRPBF-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431IMS#TRPBF-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431CMS#PBF-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431CMS-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431IMSTR-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431IMS-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2431CMSTR-ND - IC ADC 20BIT DIFFINPUT/REF10MSOP
LTC2430/LTC2431
36
24301f
The circuit shown in Figure 42 shows a more rigorous
example of Figure 41, with increased noise suppression
and more protection for remote applications.
Figure 43 shows an example of gain in the excitation circuit
and remote feedback from the bridge. The LTC1043s
provide voltage multiplication, providing
±10V from a 5V
reference with only 1ppm error. The amplifiers are used at
unity-gain and, hence, introduce a very little error due to
gain error or due to offset voltages. A 1
V/°Coffsetvoltage
APPLICATIO S I FOR ATIO
WU
UU
drift translates into 0.05ppm/
°C gain error. Simpler alter-
natives, with the amplifiers providing gain using resistor
arrays for feedback, can produce results that are similar to
bridge sensing schemes via attenuators. Note that the
amplifiers must have high open-loop gain or gain error will
be a source of error. The fact that input offset voltage has
relatively little effect on overall error may lead one to use
low performance amplifiers for this application. Note that
the gain of a device such as an LF156, (25V/mV over
350
BRIDGE
0.1
F
1
F
15V
–15V
38
14
7
4
13
12
11
10V
5V
15V
U1
LTC1043
6
2
7
4
7
4
–
+
REF+
REF–
IN+
IN–
GND
VCC
2431 F43
5V
47
F
0.1
F
10V
+
17
5
15
6
18
3
2
U2
LTC1043
1
F
FILM
8
14
7
4
13
12
11
*
5V
U2
LTC1043
17
–10V
LT1236-5
1k
33
Q1
2N3904
0.1
F
15V
–15V
3
6
2
–
+
1k
33
–10V
10V
Q2
2N3906
*FLYING CAPACITORS ARE
1
F FILM (MKP OR EQUIVALENT)
SEE LTC1043 DATA SHEET FOR
DETAILS ON UNUSED HALF OF U1
LTC1150
20
200
20
200
0.1
F
10
F
+
LTC2430/
LTC2431
Figure 43. LTC1043 Provides Precise 4
× Reference for Excitation Voltages
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