TMUX8212 datasheet(22/32 Pages) TI

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9 Detailed Description

9.1 Overview

The TMUX8211, TMUX8212 and TMUX8213 are a modern complementary metal-oxide semiconductor (CMOS)

analog switches in quad single-pole single-throw configuration. The devices work well with dual supplies, a

single supply, or asymmetric supplies.

9.2 Functional Block Diagram

SEL1

SEL2

SEL3

SEL4

TMUX8211

TMUX8212

TMUX8213

SEL1

SEL2

SEL3

SEL4

SEL1

SEL2

SEL3

SEL4

ALL SWITCHES SHOWN FOR A LOGIC 0 INPUT

9.3 Feature Description

9.3.1 Bidirectional Operation

The devices conduct equally well from source (Sx) to drain (Dx) or from drain (Dx) to source (Sx). Each signal

path has similar characteristics in both directions.

9.3.2 Flat On-Resistance

The TMUX821x devices are designed with a special switch architecture to produce ultra-flat on-resistance

(RON) across most of the switch input operating region. The flat RON response allows the device to be used in

precision sensor applications since the RON is controlled regardless of the signals sampled. The architecture

is implemented without a charge pump so no unwanted noise is produced from the device to affect sampling

accuracy.

The flatest on-resistance region extends from VSS to roughly 5 V below VDD. Once the signal is within 5 V of VDD

the on-resistance will expoentially increase and may impact desired signal transmission.

9.3.3 Protection Features

These devices offer a number of protection features to enable robust system implementations.

9.3.3.1 Fail-Safe Logic

Fail-safe logic circuitry allows voltages on the logic control pins to be applied before the supply pins, protecting

the device from potential damage. Additionaly the fail safe logic feature allows the logic inputs of the mux to be

interfaced with high voltages, allowing for simplified interfacing if only high voltage control signals are present.

The logic inputs are protected against positive faults of up to +48 V in powered-off condition, but do not offer

protection against negative overvoltage condition.

Fail-safe logic also allows the devices to interface with a voltage greater than VDD on the control pins during

normal operation to add maximum flexibility in system design. For example, with a VDD = 15 V, the logic control

pins could be connected to +24 V for a logic high signal which allows different types of signals, such as analog

feedback voltages, to be used when controlling the logic inputs. Regardless of the supply voltage, the logic

inputs can be interfaced as high as 48 V.

TMUX8212

SCDS434A – OCTOBER 2021 – REVISED DECEMBER 2021

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