REV. 0

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

SSM2005

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

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999

5.1-Channel Soundfield Generator

FEATURES

Generates 5.1-Channel Soundfield from All Stereo Sources

No Pre-Encoding Required

Excellent Decoding of Pre-Encoded Sources

4- or 5-Speaker Operation

Subwoofer Output

Full Bandwidth on All Channels

Optimized Modes for Video and Music

Excellent Surround Image at All Positions

Independent Left and Right Surround Steering

No Surround Channel Delay Required

Built-In White Noise Generator

APPLICATIONS

Home Theater Receivers

VCD/DVD Players

Auto Sound Receivers and Amplifiers

Surround Sound Decoders

Karaoke

Computer Audio Boards

Video Games

STEERING

CONTROL

GENERATOR

LEFT

RIGHT

INPUTS

RIGHT

SURROUND

LEFT

SURROUND

CENTER

RIGHT

LEFT

RESET

SERIAL BUS

OUTPUTS

L+R FOR

SUBWOOFER

STEERING MATRIX

AND OUTPUT

AMPLIFIERS

ANALOG

SIGNAL

PROCESSING

MODE CONTROL

LOGIC AND NOISE

GENERATOR

Figure 1. Simplified Block Diagram

PIN CONFIGURATIONS

48-Lead SSOP

(RS Suffix)

TOP VIEW

(Not to Scale)

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

SSM2005

CENTER OUT

R FILTER IN

R FILTER OUT

L FILTER IN

L FILTER OUT

L OUT

L OUT A

L IN

R OUT

R OUT A

R IN

ACOM AUDIO GND

GND

(L+R) OUT

(L–R) OUT

(L–R) HIGH IN

(L–R) LOW IN

R HIGH BAND DET.

L HIGH BAND DET.

HIGH BAND DET. OUT

R LOW BAND DET.

L LOW BAND DET.

LOW BAND DET. OUT

LF OUT

RF OUT

LS OUT

RS OUT

NOISE IN

NOISE OUT

LOAD

RESET

DATA IN

ACOM AUDIO GND

GND

WRITE

CLOCK IN

FRONT/REAR TC FILTER

LOW BAND TC FILTER

HIGH BAND TC FILTER

FRONT/REAR DET.

FRONT/REAR (L–R) DET.

FRONT/REAR (L+R) DET.

AUTOBALANCE LOCKOUT

AUTOBALANCE TC

GENERAL DESCRIPTION

surround soundfield from any stereo source, including VCD, DVD,

VCR, CD and FM stereo broadcasts. The SSM2005 is also compat-

ible with encoded sources, such as Dolby ProLogic

Surround encoded movies and music. External delays and noise

reduction processors are not required for the surround channels.

Circle Surround encoded stereo signals will produce a full 360º

soundfield when played through the SSM2005. Recording engi-

neers can encode sounds to any of the five speakers surrounding

the listener. Left Front, Right Front, Center, and differentiated

Left and Right surround channels are generated, providing a realis-

tic ambiance effect with either 4- or 5-speaker configurations.

The SSM2005 is available from Analog Devices, subject to the

License and Royalty requirements as described on the following

page of the data sheet.

and

are registered trademarks of SRS Labs, Inc. and ValenceTechnology Ltd.

Circle Surround is a registered trademark of SRS Labs, Inc. and Valence Technology Ltd.

Dolby ProLogic is a registered trademark of Dolby Laboratories Licensing Corporation, San Francisco, California.

Circle Surround technology is protected under one or more of the following U.S. Patents and corresponding patents

worldwide: 5,319,713; 5,333,201; 5,638,452; 5,771,295.