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INA819 데이터시트(PDF) 19 Page - Texas Instruments

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부품명 INA819
상세설명  35-關V Offset, 8-nV/?숰z Noise, Low-Power Precision Instrumentation Amplifier
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R1
25 k
RB
VB
+VS
-VS
+VS
-VS
+VS
-VS
+VS
-VS
+VS
-VS
Super-
NPN
Super-
NPN
RG
(External)
+VS
-VS
Overvoltage
Protection
Overvoltage
Protection
RB
-IN
+IN
REF
OUT
Q1
Q2
A1
A2
A3
+VS
IB Cancellation
IB Cancellation
R2
25 k
40 k
40 k
40 k
40 k
Copyright © 2017, Texas Instruments Incorporated
RG
RG
19
INA819
www.ti.com
SBOS959 – DECEMBER 2018
Product Folder Links: INA819
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The INA819 is a monolithic precision instrumentation amplifier incorporating a current-feedback input stage and a
4-resistor difference amplifier output stage. 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 output difference amplifier, A3,
removes the common-mode component of the input signal and refers the output signal to the REF pin. The VBE
and voltage drop across R1 and R2 produce output voltages on A1 and A2 that are approximately 0.8 V lower
than the input voltages.
Each input is protected by two field-effect transistors (FETs) that provide a low series resistance under normal
signal conditions, and preserve excellent noise performance. When excessive voltage is applied, these
transistors limit input current to approximately 8 mA.
8.2 Functional Block Diagram


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