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INA849 Datasheet(PDF) 16 Page - Texas Instruments

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Part # INA849
Description  INA849 Ultra-Low-Noise (1 nV/?숰z), High-Bandwidth, Instrumentation Amplifier
PDF  36 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA849 Datasheet(HTML) 16 Page - Texas Instruments

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8 Detailed Description
8.1 Overview
The INA849 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 produce
output voltages on A1 and A2 that are approximately 0.8 V lower than the input voltages.
8.2 Functional Block Diagram
R1
3 k
RB
VB
+VS
íVS
+VS
íVS
+VS
íVS
+VS
íVS
+VS
Super-
NPN
Super-
NPN
+VS
RB
íIN
+IN
REF
OUT
Q1
Q2
A1
A2
A3
+VS
IB Cancellation
IB Cancellation
R2
3 k
RG
C1
C2
íVS
íVS
RG
RG
R3
5 k
R4
5 k
R5
5 k
R6
5 k
INA849
SBOS945B – NOVEMBER 2020 – REVISED APRIL 2021
www.ti.com
16
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Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: INA849



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