Detailed Description

The MAX4780/MAX4784 are low 0.7

Ω (at V+ = +2.7V)

on-resistance, low-voltage, quad 2:1 analog multiplexers/

demultiplexers that operate from a +1.6V to +4.2V single

supply. CMOS switch construction allows switching

analog signals that are within the supply voltage range

(GND to V+).

When powered from a +2.7V supply, the 0.7

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 maximum

ratings, because stresses beyond the listed ratings can

cause permanent damage to the devices. Always

sequence V+ on first, followed by NO_, NC_, 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.

0.7

Multiplexers

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7

Pin Description

PIN

MAX4780

MAX4784

TSSOP

THIN QFN

TSSOP

THIN QFN

NAME

FUNCTION

1151

15

A0

Address Input

2162

16

NC1

Normally Closed Terminal

3131

NO1

Normally Open Terminal

4242

COM1

Analog Switch Common Terminal

5353

NC2

Normally Closed Terminal

6464

NO2

Normally Open Terminal

7575

COM2

Analog Switch Common Terminal

8686

GND

Ground

9797

COM3

Analog Switch Common Terminal

10

8

10

8

NO3

Normally Open Terminal

11

9

11

9

NC3

Normally Closed Terminal

12

10

12

10

COM4

Analog Switch Common Terminal

13

11

13

11

NO4

Normally Open Terminal

14

12

14

12

NC4

Normally Closed Terminal

15

13

—

—

A1

Address Input

——

15

13

EN

Enable. Connect to GND for normal operation.

Connect to logic-level high to turn all switches off.

16

14

16

14

V+

Positive Supply Voltage

1.6V TO 4.2V

INTERNAL

SPEAKER

Ω

RING TONE/

MELODY IC

MAX4780

AUDIO

CODEC

SYSTEM

CONTROLLER

EXTERNAL

SPEAKER

Ω OR 32Ω

Typical Application Circuit