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INA821 Datasheet(PDF) 19 Page - Texas Instruments

Part # INA821
Description  INA818 35-μV Offset, 8-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier
PDF  43 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
INA818
www.ti.com
SBOS894A – APRIL 2019 – REVISED JUNE 2019
Product Folder Links: INA818
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The INA818 is a monolithic, precision instrumentation amplifier incorporating 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 transistors Q1 and Q2 and is forced across resistor RG, which causes a
signal current to flow through resistors 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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