TMUX7308F datasheet(39/54 Pages) TI

39 / 54 page

10 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

10.1 Application Information

The TMUX7308F and TMUX7309F are part of the fault protected switches and multiplexers family of devices.

The abilty to protect downstream components from overvoltage events up to ±60 V makes these switches and

multiplexers suitable for harsh environments.

10.2 Typical Application

In analog input programmable logic controllers (PLC) a multiplexer is often used to switch multiple sensors

to a single ADC. By using a multiplexer, the number of components in the system can be reduced to save

system cost and size. In a PLC module a ±10 V input signal range is common for interfacing with external field

transmitters and sensors; however, there are a number of fault cases that may occur that can be damaging

to many of the integrated circuits. Such fault conditions may include, but are not limited to, human error from

wiring connections incorrectly, component failure or wire shorts, electromagnetic interference (EMI) or transient

disturbances, and so forth.

Sensors

LED

Photo

Detector

Thermocouple

Current Sensing

Optical Sensor

TMUX7308F

Gain / Filter

Network

ADS125H01

REF5025

GND

VSS

1.8V Logic

Signals

VDD

Bridge Sensor

ISO77xx

Signal

Processing

Power Module

PLC Analog

Input Module

GND

Supply

Fault

Protected

Mux Inputs

Figure 10-1. Typical Application

www.ti.com

TMUX7308F, TMUX7309F

SCDS403B – FEBRUARY 2021 – REVISED DECEMBER 2021

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