參數(shù)資料
型號(hào)： INA117BM
元件分類： 差分放大器
英文描述： High Common-Mode Voltage DIFFERENCE AMPLIFIER
中文描述： 高共模電壓差分放大器
文件頁(yè)數(shù)： 6/14頁(yè)
文件大?。?/td> 192K
代理商： INA117BM
6
INA117
APPLICATION INFORMATION
Figure 1 shows the basic connections required for operation.
Applications with noisy or high impedance power supply lines
may require decoupling capacitors close to the device pins.
The output voltage is equal to the differential input volt-
age between pins 2 and 3. The common mode input
voltage is rejected.
Internal circuitry connected to the compensation pin 8 can-
cels the parasitic distributed capacitance between the feed-
back resistor, R
2
, and the IC substrate. For specified dy-
namic performance, pin 8 should be grounded or connected
through a 0.1
μ
F capacitor to an AC ground such as V+.
COMMON-MODE REJECTION
Common-mode rejection (CMR) of the INA117 is depend-
ent on the input resistor network, which is laser-trimmed for
accurate ratio matching. To maintain high CMR, it is impor-
tant to have low source impedances driving the two inputs.
A 75
resistance in series with pin 2 or 3 will decrease CMR
from 86dB to 72dB.
Resistance in series with the reference pins will also degrade
CMR. A 4
resistance in series with pin 1 or 5 will decrease
CMRR from 86dB to 72dB.
Most applications do not require trimming. Figures 2 and 3
show optional circuits that may be used for trimming offset
voltage and common-mode rejection.
TRANSFER FUNCTION
Most applications use the INA117 as a simple unity-gain
difference amplifier. The transfer function is:
V
O
= V
3
– V
2
V
3
and V
2
are the voltages at pins 3 and 2.
FIGURE 1. Basic Power and Signal Connections.
+
+
380k
380k
380k
21.1k
20k
4
7
2
3
8
1
5
–15V
+15V
1μF
Tantalum
1μF
Tantalum
–In = V
2
+In = V
3
V
O
= V
3
– V
2
6
R
1
R
2
R
4
R
5
R
3
380k
380k
380k
21.1k
20k
4
7
2
3
8
1
5
V–
V+
V
2
V
3
V
O
= V
3
– V
2
6
100k
10
50k
±1.5mV
Range
–15V
+15V
380k
380k
380k
21.1k
20k
4
7
2
3
8
1
5
V–
V+
V
2
V
3
V = V – V
6
10k
±10mV
100
100
V+
V–
100μA
1/2 REF200
100μA
1/2 REF200
OPA27
Offset adjustment is regulated—
insensitive to power supply variations.
(a)
(b)
FIGURE 2. Offset Voltage Trim Circuits.
Some applications, however, apply voltages to the reference
terminals (pins 1 and 5). A more complete transfer function
is:
V
O
= V
3
– V
2
+ 19 V
5
– 18 V
1
V
5
and V
1
are the voltages at pins 5 and 1.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
INA117BM1 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Common-Mode Voltage DIFFERENCE AMPLIFIER
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INA117BM-22 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Common-Mode Voltage DIFFERENCE AMPLIFIER
INA117BM-3 制造商:Rochester Electronics LLC 功能描述:- Bulk
INA117BM-33 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Common-Mode Voltage DIFFERENCE AMPLIFIER
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