TMUX7309F datasheet(27/40 Pages) TI

27 / 40 page

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 9-1. Typical Application

9.2.1 Design Requirements

Table 9-1. Design Parameters

PARAMETER

VALUE

Positive supply (VDD) mux and ADC

+15 V

Negative supply (VSS) mux and ADC

-15 V

Power board supply voltage

24 V

Input / output signal range non-faulted

-15 V to 15 V

Overvoltage protection levels

-60 V to 60 V

Control logic thresholds

1.8 V compatible, up to 44 V

Temperature range

-40°C to +125°C

9.2.2 Detailed Design Procedure

The image shows the case where an incorrect wiring condition occurred and one of the input connectors has

been short to the power board supply voltage. If the board supply voltage is higher than the power supply of

the multiplexer, then the TMUX7308F or TMUX7309F will disconnect the source input from passing the signal to

protect the downstream ADC. The drain pin of the mux will be pulled up to the supply voltage VDD through a 40

kΩ resistor to allow the ADC to determine a fault condition has occurred.

10 Power Supply Recommendations

The TMUX7308F and TMUX7309F operate across a wide supply range of ±5 V to ±22 V (8 V to 44 V in

single-supply mode). They also perform well with asymmetrical supplies such as VDD = 15 V and VSS= –5 V. For

improved supply noise immunity, use a supply decoupling capacitor ranging from 1 µF to 10 µF at both the VDD

and VSS pins to ground. Always ensure the ground (GND) connection is established before supplies are ramped.

As a best practice, it is recommended to ramp VSS first before VDD in dual or asymmetrical supply applications.

www.ti.com

TMUX7308F

SCDS403A – FEBRUARY 2021 – REVISED OCTOBER 2021

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