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INA159 Datasheet(PDF) 19 Page - Texas Instruments

Part # INA159
Description  INA826 Precision, 200-μA Supply Current, 3-V to 36-V Supply Instrumentation Amplifier With Rail-to-Rail Output
PDF  51 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

INA159 Datasheet(HTML) 19 Page - Texas Instruments

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R1
24.7 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
24.7 k
50 k
50 k
50 k
50 k
RG
RG
19
INA826
www.ti.com
SBOS562G – AUGUST 2011 – REVISED JUNE 2020
Product Folder Links: INA826
Submit Documentation Feedback
Copyright © 2011–2020, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 Inside the INA826
See the Functional Block Diagram section for a simplified representation of the INA826. A more detailed
diagram, shown in Figure 58, provides additional insight into the INA826 operation.
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.
The differential input voltage is buffered by Q1 and Q2 and is impressed across RG, causing 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 terminal.
The equations shown in Figure 58 describe the output voltages of A1 and A2. The VBE and voltage drop across
R1 and R2 produce output voltages on A1 and A2 that are approximately 0.8 V higher than the input voltages.
Figure 58. INA826 Simplified Circuit Diagram



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