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INA821 Datasheet(PDF) 19 Page - Texas Instruments

Part # INA821
Description  INA821 35-μV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier
PDF  50 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

INA821 Datasheet(HTML) 19 Page - Texas Instruments

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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
INA821
www.ti.com
SBOS893D – AUGUST 2018 – REVISED JUNE 2020
Product Folder Links: INA821
Submit Documentation Feedback
Copyright © 2018–2020, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The INA821 is a monolithic precision instrumentation amplifier that incorporates a current-feedback input stage
and a four-resistor difference amplifier output stage. The functional block diagram in the next section 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 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 produces
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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