10.2.1 Design Requirements

Table 10-1. Design Parameters

PARAMETER

VALUE

+15 V

-15 V

Power board supply voltage

24 V

Input or 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

10.2.2 Detailed Design Procedure

The normal operation of the application is to take multiple differential inputs and use a multi-channel switch to

pass the signal to the downstream instrumentation amplifier. A fault protected switch can add extra robustness to

the sytem against fault conditions while also reducing the number of components required to interface with the

systems physical input channels.

The image shows the case where a human wired the condition incorrectly and one of the input connectors

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

multiplexer, then the TMUX741xF device will disconnect the source input from passing the signal to protect the

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

resistor to allow the system to determine a fault condition has occured.

11 Power Supply Recommendations

The TMUX7411F, TMUX7412F, and TMUX7413F operates across a wide supply range of ±5 V to ±22 V (8 V to

improved supply noise immunity. Always ensure the ground (GND) connection is established before supplies are

ramped.

TMUX7411F, TMUX7412F, TMUX7413F

SCDS404 – MARCH 2021

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