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INA333 Datasheet(PDF) 17 Page - Texas Instruments

Part # INA333
Description  PGA280 Zerø-Drift, High-Voltage, Programmable Gain Instrumentation Amplifier
PDF  49 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

INA333 Datasheet(HTML) 17 Page - Texas Instruments

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600W
600W
VSP
VSON
VSON
100 A
Source
m
100 A
Sink
m
F1
F2
D12
G1
G2
C1
B1
A1b
B1b
A1
INP2
INP1
BUF
600W
600W
VSON
DVDD
DGND
VSON
C2
B2
A2b
B2b
A2
INN2
INN1
BUF
VSN
Gain
Network
SerialPeripheralInterface
andControls
17
PGA280
www.ti.com
SBOS487B – JUNE 2009 – REVISED MARCH 2020
Product Folder Links: PGA280
Submit Documentation Feedback
Copyright © 2009–2020, Texas Instruments Incorporated
Feature Description (continued)
7.3.1.1 Input Switch Network
Figure 44 shows the arrangement of the input switches. They are controlled individually via the digital SPI. The
switches B1b, B2b, A1b, and A2b are controlled automatically with the buffer (BUF) operation.
Figure 44. Input Switch Diagram
Switches A and B select the signal input. Input 1 (INP1 and INN1) provides two current sources and two switches
that connect to VSON (which is typically the analog ground). This configuration is intended for wire break
diagnosis. D12 can discharge an external capacitor or generate a starting condition.
Switches C1 and C2 are used to measure the input voltage referred to GND (VSON); for example, with A1 and
C2 closed. This scheme measures the voltage signal connected to the input pin (INP1) referred to a common
ground. The BUF output is protected against a short to VSON. See the SPI and Register Description section for
more information about switch control.



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