9 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.

9.1 Application Information

The TMUX7208M is part of the precision switches and multiplexers family of devices. These devices operate

with dual supplies (±4.5V to ±22V), a single supply (4.5V to 44V), or asymmetric supplies (such as VDD = 12 V,

VSS = –5V), and offer true rail-to-rail input and output. The TMUX7208M offers low RON, low on and off leakage

currents and ultra-low charge injection performance. These features makes the TMUX72xx a family of precision,

robust, high-performance analog multiplexers for high-voltage, industrial applications.

9.2 Typical Application

One example to take advantage of performance is the implementation of multiplexed data acquisition front end

for multiple input sensors. Applications such as analog input modules for programmable logic controllers (PLCs),

data acquisition (DAQ), and semiconductor test systems commonly need to monitor multiple signals into a single

ADC channel. The multiple inputs can come from different system voltages being monitored, or environmental

sensors such as temperature or humidity. Figure 9-1 shows a simplified example of monitoring multiple inputs

into a single ADC using a multiplexer.

Analog Inputs

LED

Photo

Detector

Bridge Sensor

Thermocouple

Current

Sensing

Optical Sensor

TMUX7208M

ADS8661

D

S1

S2

S3

S4

S5

S6

S7

S8

A0

A1

A2

GND

VDD +15 V

1.8V Logic

Control Signals

EN

VDD

VSS -15 V

±12V

Inputs

VDD +5 V

CFLT

RFLT

Figure 9-1. Multiplexed Data Acquisition Front End

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TMUX7208M

SCDS454 – JANUARY 2024

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