8 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.

8.1 Application Information

The TMUX11xx family offers ultra-low input and output leakage currents and low charge injection. These devices

operate up to 5.5V, and offer true rail-to-rail input and output of both analog and digital signals. The TMUX1119

has a low on-capacitance which allows faster settling time when multiplexing inputs in the time domain. These

features make the TMUX11xx devices a family of precision, high-performance switches and multiplexers for

low-voltage applications.

8.2 Typical Application

Figure 8-1 shows an ultrasonic gas meter front end. The ultrasonic front end design utilizes time of flight (TOF)

measurement to determine the amount of gas flowing in a pipe. The circuit utilizes the MSP430FR5994, two ultra

low power operational amplifiers, OPA835 and OPA836, along with two TMUX1119, 2:1 precision switches.

ADC

TX/RX

MUX

MOSI

TX

32 kHz

MSP430FR599

8 MHz

OPA836

OPA835

TMUX1119

x1

TMUX1119

x2

SEL

SEL

Figure 8-1. Ultrasonic Gas Meter System

8.2.1 Design Requirements

For this design example, use the parameters listed in Table 8-1.

Table 8-1. Design Parameters

PARAMETERS

VALUES

Supply (VDD)

5V

I/O signal range

0V to VDD (Rail to Rail)

Control logic thresholds

1.8V compatible

Single-shot standard deviation (STD)

<2ns

Zero-flow drift (ZFD)

<1ns

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TMUX1119

SCDS401C – DECEMBER 2018 – REVISED FEBRUARY 2024

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