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INA821 bảng dữ liệu(PDF) 10 Page - Texas Instruments

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tên linh kiện INA821
Giải thích chi tiết về linh kiện  INA851 Precision, Low-Noise, Fully Differential Output Instrumentation Amplifier With Optional Attenuating Gain
PDF  28 Pages
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nhà sản xuất  TI [Texas Instruments]
Trang chủ  http://www.ti.com
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INA821 bảng dữ liệu(HTML) 10 Page - Texas Instruments

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8 Detailed Description
8.1 Overview
The INA851 is a monolithic, precision instrumentation amplifier that incorporates a current-feedback input stage
and a four-resistor, fully differential amplifier output stage. The schematic in Figure 8-1 shows how the differential
input voltage is buffered by Q1 and Q2, and is forced across RG, which causes a signal current to flow through
RG, R1, and R2. The fully differential amplifier, A3, removes the common-mode component of the input signal and
refers the output signal to the VOCM pin. The VBE and voltage drop across R1 and R2 produce output voltages
on A1 and A2 that are approximately 0.8 V less than the input voltages.
R1
3 k
RB
VB
+VS
VS
+VS
VS
+VS
VS
+VS
VS
+VS
Super-
NPN
Super-
NPN
+VS
RB
IN
+IN
OUT–
OUT+
Q1
Q2
A1
A2
A3
+VS
IB Cancellation
IB Cancellation
R2
3 k
Optional RG
(External)
C1
C2
VS
VS
R3
5 k
R4
5 k
R5
5 k
R6
5 k
R7
1.25 k
+VS
G02+
VS
+VS
G02–
VS
R8
1.25 k
+
–
+VS
VOCM
VS
A4
R10
500 k
VCLAMP
R9
500 k
VCLAMP+
+VS
FDA_IN–
VS
+VS
FDA_IN+
VS
R11
70 k
R12
70 k
OUT–
OUT+
C4
0.5pF
C3
0.5pF
Figure 8-1. Detailed Schematic
INA851
SBOS999 – MARCH 2022
www.ti.com
10
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: INA851



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