BLOCK DIAGRAM OF ONE SWITCH CHANNEL

CONTROL

DIGITAL

CONTROL

SW1 A

SW1 B

V–

V+

RAMP

GENERATOR

LOGIC INTERFACE

AND

BREAK-BEFORE-MAKE

CONTROL

PIN CONNECTIONS

Epoxy Mini-DIP (P Suffix)

and SOIC (S Suffix)

SW1 A

SW1 B

DGND

SW1 CONTROL

SW2 CONTROL

NC

*

SW2 B

SW2 A

SW4 A

SW4 B

V+

SW4 CONTROL

SW3 CONTROL

V–

SW3 B

SW3 A

NC = NO CONNECT

AGND

AGND

AGND

AGND

FOR BEST NOISE ISOLATION

SW1

1

2

3

4

5

6

7

8

20

19

18

17

16

15

14

13

9

10

12

11

TOP VIEW

(Not to Scale)

O

SSM2404

SW1

SW2

SW3

SW4

REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

Quad Audio Switch

SSM2404

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

FEATURES

“CIickless” Bilateral Audio Switching

Four SPST Switches in a 20-Pin Package

Ultralow THD+N: 0.0008% @ 1 kHz (2 V rms,

Low Charge Injection: 35 pC typ

@ 1 kHz)

@ 1 kHz)

Low ON Resistance: 28

typ

Low Supply Current: 900

A typ

Single or Dual Supply Operation: +11 V to +24 V or

5.5 V to

12 V

Guaranteed Break-Before-Make

TTL and CMOS Compatible Logic Inputs

Low Cost-Per-Switch

GENERAL DESCRIPTION

The SSM2404 integrates four SPST analog switches in a single

20-pin package. Developed specifically for high performance

audio applications, distortion and noise are negligible over the

full operating range of 20 Hz to 20 kHz. With very low charge

injection of 35 pC, “clickless” audio switching is possible, even

under the most demanding conditions.

Switch control is realized by conventional TTL or CMOS

logic. Guaranteed “break-before-make” operation assures that

all switches in a large system will open before any switch

reaches the ON state.

Single or dual supply operation is possible. Additional features

include –100 dB OFF isolation, –94 dB crosstalk and 28

Ω ON

resistance. Optional current-mode switching permits an

extended signal-handling range. Although optimized for large

load impedances, the SSM2404 maintains good audio

performance even under low load impedance conditions.