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

TMUX2821 and TMUX2819 are part of the beyond the supply switches and multiplexers family of devices. This

means that this device can switch signals from -5.5V to 5.5V with a low voltage supply from 1.8V to 5.5V.

Additionally, TMUX28xx features powered-off protection, which by design keeps the switches open even when

there is no supply. This unique feature combination enables the TMUX28xx to be extremely versatile for a wide

variety of applications such as boosted outputs and high common mode offsets.

8.2 Typical Applications

8.2.1 Audio Input or Output Switching

When there are multiple audio inputs available such as a line-in and a wireless connection, a switch/multiplexer

is needed to switch between audio sources. This same scheme can be used in systems where there are multiple

speaker outputs and one source as well. A TMUX2819 can be used for all of these use cases, easily supporting

line-in audio up to ±5.5V with a supply/battery voltage from 1.8V to 5.5V. Figure 8-1 shows the block diagram

for these applications. Additionally, if IEC protection is needed on the external connectors (audio jack input or

external speaker), 2 TPD1E10B06 can be used.

The TMUX2819 features excellent THD+N performance, so there is minimal impact to the audio signal quality

through the switch. This allows the system designer to save a significant portion of board area without impacting

signal integrity. Additionally, because of the low supply current requirement, the device's supply can be driven

directly with a GPIO, allowing the user to put the device into a ultra-low power mode. In this mode the

TMUX2819 operates with powered-off protection, so any high voltage present on the inputs will not propagate to

the outputs. This helps keep correct power up cycling and increases system robustness.

Audio Codec

GPIO

SEL

V

DD

Decoder

L

R

Figure 8-1. Audio Headphone and Speaker Output Switching

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TMUX2821, TMUX2819

SCDS488 – DECEMBER 2025

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Product Folder Links: TMUX2821 TMUX2819