參數(shù)資料
型號(hào)： INA125U
元件分類(lèi)： 測(cè)量放大器
英文描述： Very High Accuracy Instrumentation Amplifier
中文描述： 極高精度儀表放大器
文件頁(yè)數(shù)： 10/13頁(yè)
文件大?。?/td> 273K
代理商： INA125U
10
INA125
APPLICATION INFORMATION
Figure 1 shows the basic connections required for operation
of the INA125. Applications with noisy or high impedance
power supplies may require decoupling capacitors close to
the device pins as shown.
The output is referred to the instrumentation amplifier refer-
ence (IA
REF
) terminal which is normally grounded. This
must be a low impedance connection to assure good com-
mon-mode rejection. A resistance of 12
in series with the
IA
REF
pin will cause a typical device to degrade to approxi-
mately 80dB CMR (G = 4).
Connecting V
REF
OUT (pin 4) to one of the four available
reference voltage pins (V
REF
BG, V
REF
2.5, V
REF
5, or V
REF
10)
provides an accurate voltage source for bridge applications.
For example, in Figure 1 V
REF
OUT is connected to V
REF
10
thus supplying 10V to the bridge. It is recommended that
V
REF
OUT be connected to one of the reference voltage pins
even when the reference is not being utilized to avoid
saturating the reference amplifier. Driving the SLEEP pin
LOW puts the INA125 in a shutdown mode.
SETTING THE GAIN
Gain of the INA125 is set by connecting a single external
resistor, R
G
, between pins 8 and 9:
G
= 4 +60
k
(1)
Commonly used gains and R
G
resistor values are shown in
Figure 1.
DESIRED GAIN
(V/V)
R
G
(
)
NEAREST 1%
R
G
VALUE (
)
4
5
NC
60k
10k
3750
1304
625
306
121
60
30
6
NC
60.4k
10k
3740
1300
619
309
121
60.4
30.1
6.04
10
20
50
100
200
500
1000
2000
10000
NC: No Connection.
FIGURE 1. Basic Connections.
R
G
A
1
Ref
Amp
10V
A
2
30k
10k
10k
30k
Bandgap
V
REF
13
12
1
14
15
16
4
6
9
10
11
Sense
IA
REF
5
V
O
8
7
R
G
Load
+
–
R
(2)
R
2R
4R
INA125
V
REF
COM
V
REF
BG
V
REF
2.5
V
REF
5
V
REF
10
V
REF
Out
V
IN
0.1μF
V+
+
V
IN
–
2
SLEEP
(1)
3
0.1μF
V–
V
O
= (V
IN
– V
IN
) G
G = 4 + 60k
+
–
R
G
NOTE: (1) SLEEP pin should be connected
to V+ if shutdown function is not being used.
(2) Nominal value of R is 21k
, ±25%.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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