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MAX4734

0.8Ω, Low-Voltage, 4-Channel Analog Multiplexer

Maxim Integrated 

MAX4734

0.8Ω, Low-Voltage, 4-Channel

Analog Multiplexer

Detailed Description

The MAX4734 is a low 0.8Ω (max) (at V+ = 2.7V) on-

resistance, low-voltage, 4-channel CMOS analog multi-

plexer that operates from a 1.6V to 3.6V single supply.

CMOS switch construction allows switching analog sig-

nals that range from GND to V+.

When powered from a 2.7V supply, the 0.8Ω (max) RON

allows high continuous currents to be switched in a variety

of applications.

Applications Information

Proper power-supply sequencing is recommended for

all CMOS devices. Do not exceed the absolute maxi-

mum ratings, because stresses beyond the listed ratings

can cause permanent damage to the devices. Always

sequence V+ on first, followed by NO_ or COM.

Although it is not required, power-supply bypassing

improves noise margin and prevents switching noise

propagation from the V+ supply to other components. A

0.1μF capacitor, connected from V+ to GND, is adequate

for most applications.

Logic Inputs

The MAX4734 logic inputs can be driven up to 3.6V

regardless of the supply voltage. For example, with a 1.8V

supply, A_ and EN may be driven low to GND and high

to 3.6V. Driving A_ and EN rail-to-rail minimizes power

consumption.

Analog Signal Levels

Analog signals that range over the entire supply voltage

(V+ to GND) can be passed with very little change in on-

resistance (see the Typical Operating Characteristics).

The switches are bidirectional, so the NO_ and COM_

pins can be used as either inputs or outputs.

Layout

High-speed switches require proper layout and design

procedures for optimum performance. Reduce stray induc-

tance and capacitance by keeping traces short and wide.

Ensure that bypass capacitors are as close to the device as

possible. Use large ground planes where possible.

Test Circuits/Timing Diagrams

V+

VEN EN

V+

NO1

NO2–NO4

MAX4734

A0

A1

COM

GND

VNO_

RL

VOUT

35pF

Figure 1. Switching Time

VEN = VIH + 0.5

50%

0

tR < 5ns

tF < 5ns

V+

VOUT

0

tON

90% 90%

tOFF

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