Detailed Description

The MAX4991–MAX4994 low 0.3

Ω (typ) on-resistance

analog switches have break-before-make switching

and operate from a single +1.8V to +5.5V supply. The

MAX4991/MAX4993 provide a slow turn-on time, and

with COM_ used as the output, reduce clicks and pops

due to coupling capacitors and audio amplifiers with a

DC output bias. This feature is important for existing

architectures with coupling capacitors at the output that

need click-and-pop reduction.

The MAX4993/MAX4994 DPDT switches with an active-

low enable input (EN) set all channels to high imped-

ance and reduce supply current when driven high. The

MAX4991–MAX4994 have a low 0.004% THD+N to

route high-fidelity audio signals.

Digital Control Input

The MAX4991/MAX4992 have two digital control logic

inputs, CB1 and CB2. The MAX4993/MAX4994 have a

single digital-control logic input, CB. The digital control

logic inputs control the position of the corresponding

switch as shown in the

Functional Diagram. Driving

logic inputs rail-to-rail minimizes power consumption.

Enable Input (MAX4993/MAX4994)

The MAX4993/MAX4994 feature an active-low enable

input (EN). When EN is driven high, the switches are

high impedance and reduce supply current. When EN

is driven low, the MAX4993/MAX4994 operate in nor-

mal mode. Driving EN rail-to-rail minimizes power con-

sumption.

Switches with Slow Turn-On Time

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7

CB1

NC1

COM1

NO1

MAX4991/MAX4992

0

CB1

NO1

MAX4991/MAX4992

OFF

NC1

ON

1ON

OFF

0

CB2

NO2

MAX4991/MAX4992

OFF

NC2

ON

1ON

OFF

CB2

NC2

COM2

NO2

CB

NC1

COM1

NO1

MAX4993/MAX4994

EN

NC2

COM2

NO2

0

EN

MAX4993/MAX4994

0

1

0

CB

1

X

OFF

NO_

ON

OFF

ON

NC_

OFF

OFF

X = DON'T CARE.

Functional Diagram