參數(shù)資料
型號(hào)： ADS1226IRGVT
廠商： Analog Devices, Inc.
英文描述： 24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator
中文描述： 24位模擬數(shù)字轉(zhuǎn)換器與單和雙通道差分輸入和內(nèi)部振蕩器
文件頁(yè)數(shù)： 19/24頁(yè)
文件大小： 398K
代理商： ADS1226IRGVT
www.ti.com
LARGE INPUT SIGNALS
Many industrial applications require measurement of
signals that go beyond 5V. The ADS1225 can be
used to measure large input signals with the help of
an
INA159.
The
precision,
differential amplifier converts a
±
10V input to a 5V
input scale. This design allows systems to be run
from a single 5V supply without the need for higher
voltage supplies for signal conditioning.
20k
W
100k
W
40k
W
100k
W
40k
W
V+
V
-
SENSE
REF 2
REF 1
+IN
-
IN
INA159
V
10V
±
IN
OUT
ADS1225
VREFP
VREFN
START
DRDY
/DOUT
AVDD
DVDD
GND
AINP1
MSP430xxx
or C
m
GND
+5V
+5V
10 F
m
0.1 F
m
0.1 F
m
AINN1
+3V
+3V
0.1 F
m
1 F
m
SCLK
MODE
TEMPEN
BUFEN
1k
W
ADS1225
ADS1226
SBAS346–MAY 2006
Figure 33
shows a basic schematic. The negative
input of the INA159 is grounded while the positive
input is allowed to swing from –10V to +10V.
Similarly, the negative input of the ADS1225 is
grounded while the positive input swings from 0.5V
to +4.5V given the useful V
OUT
swing of the INA159.
The larger signal is easily measured without the
need for extra
±
10V supplies. See the
INA159
data
sheet for additional details.
level
translation
Figure 33. With the Help of an INA159, the ADS1225 Measures
±
10V Signals
19
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