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INA190 bảng dữ liệu(PDF) 22 Page - Texas Instruments

tên linh kiện INA190
Giải thích chi tiết về linh kiện  INA190 Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Precision Current-Sense Amplifier With Enable
PDF  48 Pages
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nhà sản xuất  TI2 [Texas Instruments]
Trang chủ  https://www.ti.com
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INA190 bảng dữ liệu(HTML) 22 Page - Texas Instruments

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Temperature (qC)
-50
-25
0
25
50
75
100
125
150
1
2
3
4
5
6
D115
A1
A2, A3, A4, A5
VOUT
VS
1.7 V to 5.5 V
IN±
IN+
VS
OUT
RF
CF
RF
+
±
Bus Voltage
up to 40 V
RSENSE
Load
Capacitively Coupled
Amplifier
ENABLE
3dB
F F
1
f
4 R C
S
RDIFF
INA190
REF
GND
CBYPASS
0.1 µF
22
INA190
SBOS863D – MARCH 2018 – REVISED NOVEMBER 2019
www.ti.com
Product Folder Links: INA190
Submit Documentation Feedback
Copyright © 2018–2019, Texas Instruments Incorporated
Application Information (continued)
8.1.3 Signal Conditioning
When performing accurate current measurements in noisy environments, the current-sensing signal is often
filtered. The INA190 features low input bias currents. Therefore, adding a differential mode filter to the input
without sacrificing the current-sense accuracy is possible. Filtering at the input is advantageous because this
action attenuates differential noise before the signal is amplified. Figure 40 provides an example of how to use a
filter on the input pins of the device.
Figure 40. Filter at the Input Pins
The differential input impedance (RDIFF) shown in Figure 40 limits the maximum value for RF. The value of RDIFF
is a function of the device temperature, as shown in Figure 41.
Figure 41. Differential Input Impedance vs Temperature



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