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INA821 Datasheet(PDF) 22 Page - Texas Instruments

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Part # INA821
Description  INA851 Precision, Low-Noise, Fully Differential Output Instrumentation Amplifier With Attenuating Gain and Output Clamping
PDF  52 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA821 Datasheet(HTML) 22 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
SBOS999A – MARCH 2022 – REVISED OCTOBER 2022
www.ti.com
22
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Copyright © 2022 Texas Instruments Incorporated
Product Folder Links: INA851



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