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AMC0200R bảng dữ liệu(PDF) 31 Page - Texas Instruments

tên linh kiện AMC0200R
Giải thích chi tiết về linh kiện  AMC0x00R Precision, ±250-mV Input, Basic and Reinforced Isolated Amplifiers With Single-Ended, Ratiometric Output
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AMC0200R bảng dữ liệu(HTML) 31 Page - Texas Instruments

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8.2.2.2 Connecting the REFIN Pin
The reference input has a finite input impedance as shown in the Functional Block Diagram . Consider this
impedance when driving the REFIN pin from a high-impedance source. Connect a 100nF capacitor from
REFIN to GND2 to filter out high-frequency noise at the reference input. Figure 8-3 shows different options
for connecting the REFIN pin.
VDD2
OUT
REFIN
GND2
100nF
Reference voltage
RSOURCE
VDD2 supply
(3.3V or 5V)
VDD2
OUT
REFIN
GND2
100nF
VDD2 supply
(3.3V or 5V)
Consider finite
input impedance
VDD2
OUT
REFIN
GND2
R1
R2
+
–
Figure 8-3. Connecting the REFIN Pin
In the first example, REFIN is shorted to VDD2. In the second example, VREFIN is derived from VDD2 through a
buffered resistive divider. In the third example, an external voltage source drives the reference input pin.
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AMC0300R, AMC0200R
SBASAR9 – DECEMBER 2025
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