參數(shù)資料
型號(hào): INA322
元件分類: 測(cè)量放大器
英文描述: Precision Instrumentation Amplifier
中文描述: 精密儀表放大器
文件頁(yè)數(shù): 9/15頁(yè)
文件大?。?/td> 303K
代理商: INA322
INA322
SBOS174
9
APPLICATIONS INFORMATION
The INA322 is a modified version of the classic “two op amp”
instrumentation amplifier, with an additional gain amplifier.
Figure 1 shows the basic connections for the operation of the
INA322 and INA2322. The power supply should be capaci-
tively decoupled with 0.1
μ
F capacitors as close to the
INA322 as possible for noisy or high-impedance applica-
tions.
The output is referred to the reference terminal, which must
be at least 1.2V below the positive supply rail.
OPERATING VOLTAGE
The INA322 family is fully specified and guaranteed over a
supply range of +2.7V to +5.5V, with key parameters
guaranteed over the temperature range of -55
°
C to +125
°
C.
Parameters that vary significantly with operating conditions,
such as load conditions or temperature, are shown in the
Typical Performance Curves.
The INA322 may be operated on a single supply. Figure 2
shows a bridge amplifier circuit operated from a single +5V
supply. The bridge provides a small differential voltage
riding on an input common-mode voltage.
FIGURE 1. Basic Connections.
FIGURE 2. Bridge Amplifier of the INA322.
160k
40k
40k
160k
3
2
5
1
7
8
4
Also drawn in simplified form:
6
REF
0.1
μ
F
0.1
μ
F
RG
V
IN
V
IN
+
V
V+
A1
A3
A2
V
O
= ((V
IN
+)
(V
IN
))
G
Short V
to RG
for G = 5
5
10
50
100
SHORT
100k
90k
190k
OPEN
100k
10k
10k
R
2
R
1
Shutdown
(For Single
Supply)
DESIRED GAIN
(V/V)
R
1
R
2
G = 5 + 5(R
2
/ R
1
)
INA322
5
3
2
V
OUT
8
7
6
4
1
V+
Shutdown
RG
V
IN
V
V
IN
+
REF
Bridge
Sensor
+5V
NOTE: (1) REF should be adjusted for the desired output level,
keeping in mind that the value of REF affects the common-mode
input range. See Typical Performance Curves.
INA322
5
3
2
V
OUT
8
7
6
4
V
1
V+
Shutdown
RG
V
IN
V
IN
+
REF
(1)
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