8 Detailed Description

8.1 Functional Block Diagram

The TMUX4827 is an 2:1, 2-channel multiplexer or demultiplexer. Each input is turned on or turned off based on

the state of the address lines and VDD pin.

S1A

S1B

D1

SEL

V

DD

Decoder

S2A

S2B

D2

8.2 Device Functional Modes

Table 8-1 provides the truth table for the TMUX4827.

Table 8-1. TMUX4827 Truth Table

VDD SEL

Selected Input Connected To Drain (D) Pin

0

X(1)

All channels are off (Hi-Z). Device is in power-off

protection.

1

0

SxA

1

1

SxB

(1)

X denotes do not care.

8.3 Feature Description

8.3.1 Beyond the Supply

The TMUX4827 supports signal voltages beyond the supply on the source (Sx) and drain (Dx) pins up to ±12

V. This feature allows both AC and DC bidirectional signals above Vdd and below ground to pass through the

switch without distortion, using a unidirectional supply. The device remains within the performance mentioned in

the Electrical Characteristics.

Vdd

12V

Vdd

Switch

Driver

0V

-12V

Vdd

12V

0V

-12V

Figure 8-1. Beyond the Supply Signal Support

8.3.2 Bidirectional Operation

The TMUX4827 conducts equally well from source (Sx) to drain (Dx) or from drain (Dx) to source (Sx). Each

channel has very similar characteristics in both directions and supports both analog and digital signals.

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TMUX4827

SCDS457A – MAY 2023 – REVISED JUNE 2023

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