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INA141U 参数 Datasheet PDF下载

INA141U图片预览
型号: INA141U
PDF下载: 下载PDF文件 查看货源
内容描述: 精密,低功耗,G = 10,100仪表放大器 [Precision, Low Power, G = 10, 100 INSTRUMENTATION AMPLIFIER]
分类和应用: 仪表放大器
文件页数/大小: 14 页 / 339 K
品牌: TI [ TEXAS INSTRUMENTS ]
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APPLICATION INFORMATION  
Gains between 10 and 100 can be achieved by connecting an  
external resistor to the jumper pins. This is not recom-  
mended, however, because the ±25% variation of internal  
resistor values makes the required external resistor value  
uncertain. A companion model, INA128, features accurately  
trimmed internal resistors so that gains from 1 to 10,000 can  
be set with an external resistor.  
Figure 1 shows the basic connections required for operation  
of the INA141. 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 output reference (Ref) terminal  
which is normally grounded. This must be a low-impedance  
connection to assure good common-mode rejection. A resis-  
tance of 8in series with the Ref pin will cause a typical  
device to degrade to approximately 80dB CMR (G = 1).  
DYNAMIC PERFORMANCE  
The typical performance curve “Gain vs Frequency” shows  
that, despite its low quiescent current, the INA141 achieves  
wide bandwidth, even at G = 100. This is due to the current-  
feedback topology of the INA141. Settling time also re-  
mains excellent at G = 100.  
SETTING THE GAIN  
Gain is selected with a jumper connection as shown in  
Figure 1. G = 10V/V with no jumper installed. With a  
jumper installed, G = 100V/V. To preserve good gain  
accuracy, this jumper must have low series resistance. A  
resistance of 0.5in series with the jumper will decrease the  
gain by 0.1%.  
NOISE PERFORMANCE  
The INA141 provides very low noise in most applications.  
Low frequency noise is approximately 0.2µVp-p measured  
from 0.1 to 10Hz (G = 100). This provides dramatically  
improved noise when compared to state-of-the-art chopper-  
stabilized amplifiers.  
Internal resistor ratios are laser trimmed to assure excellent  
gain accuracy. Actual resistor values can vary by approxi-  
mately ±25% from the nominal values shown.  
V+  
0.1µF  
7
VIN  
INA141  
2
1
Over-Voltage  
Protection  
A1  
40kΩ  
40kΩ  
252Ω  
25kΩ  
25kΩ  
G = 10  
(no connection)  
or  
G = 100  
(connect jumper)  
6
VO = G • (VI+N – VIN  
)
A3  
5050Ω  
252Ω  
+
8
3
VO  
Load  
5
A2  
+
VIN  
Over-Voltage  
Protection  
Ref  
40kΩ  
40kΩ  
4
0.1µF  
V–  
Also drawn in simplified form:  
VIN  
VO  
INA141  
Ref  
+
VIN  
FIGURE 1. Basic Connections.  
®
8
INA141