Analog Devices SSM2005 Datasheet

®

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

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
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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
V

EE

ACOM AUDIO GND

GND

V

CC

(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
V

CC

ACOM AUDIO GND
GND
V

EE

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

Decoder

a

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

5.1-Channel Soundfield Generator
SSM2005

PIN CONFIGURATIONS

48-Lead SSOP

(RS Suffix)

GENERAL DESCRIPTION

The SSM2005 Circle Surround® decoder produces true 5.1-channel
surround soundfield from any stereo source, including VCD, DVD,
VCR, CD and FM stereo broadcasts. The SSM2005 is also compat­ible with encoded sources, such as Dolby ProLogic
Surround

encoded movies and music. External delays and noise

®

and Circle

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 engi­neers 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 realis­tic 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
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.

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.

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

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1999

Figure 1. Simplified Block Diagram

SSM2005–SPECIFICATIONS

(V

= ±6.0 V, T

S

ELECTRICAL CHARACTERISTICS

Autobalance Off, Noise Off)

Parameter Symbol Conditions Min Typ Max Units

INPUT CHARACTERISTICS␣

1

Level
Input Impedance Z

VL, V

IN

R

OUTPUT CHARACTERISTICS

Level
Left Front L
Right Front R
Center L

Left Rear, Right Rear L
Channel Separation
Left Front and Right Front / Center L
Left Rear and Right Rear / Center L
Left Rear, Left Front L
Left Rear, Right Rear L
Output Impedance Z

OUT

DYNAMIC PERFORMANCE␣

Total Harmonic Distortion + Noise THD+N All Channels 0.04 %
Signal-to-Noise Ratio SNR 88 dB
Dynamic Range, Output DR Noise Floor to 1% THD 100 dB
Headroom HR All Channels 12 dB

NOISE GENERATOR␣

Output Level

2

Matching All Channels 0.5 1.5 dB

AUTOBALANCE

Capture Range |

Capture Time V

CONTROL LOGIC␣

Logic Thresholds Logic Levels Referenced to ACOM
High (1) 2.4 V
Low (0) 0.8 V

Input Current 1 µA

Timing Characteristics See Timing Diagrams

POWER SUPPLIES␣

Operating Voltage Range

Current I

NOTES

1

0 dBd = 300 mV rms

2

With filter shown in Figure 8.

3

Specifications apply for V

Specifications subject to change without notice.

.

= ±6 V.

S

3

V
+V

S

S

–V

S,

S

LICENSING INFORMATION

= ⴙ25ⴗC, f = 2 kHz, Modes: Video, 5-2-5, Center On, Sound Spread Off,

A

Z

< 10 Ω 0 dBd

SOURCE

L and R Inputs 10 kΩ

= 0 dBd, RT = Off 0 dBd

T

= 0 dBd, LT = Off 0 dBd

T

= RT = 0 dBd, In Phase,

T

Video Mode +6 dBd

= RT = 0 dBd, Out of Phase +3 dBd

T

= RT, In Phase, Video Mode 30 dBd

T

= RT, Out of Phase 40 dBd

T

= RT, Out of Phase 30 dBd

T

= RT, Out of Phase 30 dBd

T

10 Ω

Noise Mode On, A-Weighted –10 dBd

| – |

V

H

= VR > –10 dBd,

L

|V

LEFT

| ±4dB

V

L

– V

| < 3 dB 5 s

RIGHT

Single Supply +10 +12 V

Dual Supply ±5 ±6V

VL = VR = ACOM, VS = 12 V 18 30 mA

The CIRCLE SURROUND® TECHNOLOGY rights incorporated in the SSM2005 are owned by SRS Labs, Inc. and by Valence Technology Ltd., and licensed
to Analog Devices, Inc.

Users of any SSM2005 Circle Surround decoder must first sign a free use license to purchase OEM quantities for consumer electronics applications which
may be granted upon submission of a preproduction sample to, and the satisfactory passing of performance verification tests performed by SRS Labs, Inc.
or Valence Technology Ltd. SRS Labs, Inc. and Valence Technology Ltd. reserve the right to decline a use license for any submission that does not pass
performance specifications or is not in the consumer electronics classification.

All equipment manufactured using any SSM2005 Circle Surround decoder must carry the Circle Surround logo on the front panel in a manner approved
in writing by SRS Labs, Inc. or Valence Technology Ltd. If the Circle Surround logo is printed in users manuals, service manuals or advertisements, it
must appear in a form approved in writing by SRS Labs, Inc. or Valence Technology Ltd. The rear panel of Circle Surround products, users manuals,
service manuals, and all advertisements must all carry the Circle Surround legend as specified in the Circle Surround trademark manual published by SRS
Labs, Inc. and Valence Technology Ltd.

–2– REV. 0

SSM2005

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage, V

. . . . . . . . . . . . . . . . . . . . . . ±8 V or +16 V

S

Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Operating Temperature Range . . . . . . . . . . . –20°C to +70°C

Package Type ␪

48-Lead SSOP (RS) 100 50 °C/W

S

NOTE

1

θ

is specified for worst case conditions.

JA

Junction Temperature Range . . . . . . . . . . . . . . . . . . . .+150°C

Lead Temperature Range (Soldering, 60 sec) . . . . . . .+300°C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum rating condi­tions for extended periods may affect device reliability.

ORDERING GUIDE

Temperature Package Package

Model Range Description Option

SSM2005RS-Reel –20°C to +70°C 48-Lead SSOP RS-48

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the SSM2005 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

1

JA

␪

JC

Units

–3–REV. 0

SSM2005

–Typical Performance Characteristics

10

VSY = ±6V
V

= 300mV

IN

RL = 100kV

1

THD + N – %

0.1

0.01
20 20k100

rms

CENTER OUT

LF, RF OUT

FREQUENCY – Hz

1k

10k

Figure 2. THD + N vs. Frequency; Front Channels

10

VSY = ±6V
V

= 300mV

IN

RL = 100kV

1

THD + N – %

0.1

LS OUT

rms

10

VSY = ±6V
V

= 1kHz

IN

= 100kV

R

L

0dBr = 300mV

1

THD + N – %

0.1

0.01

235

225

rms

215 25

AMPLITUDE – dBr A

LF, RF OUT

CENTER OUT

5

15

Figure 4. THD + N vs. Amplitude; Front Channels

10

VSY = ±6V
L

= RT = 1kHz; OUT OF PHASE

T

= 100kV

R

L

0dBr = 300mV

1

THD + N – %

0.1

rms

LS, RS OUT

RS OUT

0.01

20 20k100

FREQUENCY – Hz

1k

10k

Figure 3. THD + N vs. Frequency; Surround Channels

0.01

235

225

215 25

FREQUENCY – dBr A

5

15

Figure 5. THD + N vs. Frequency; Surround Channels

–4– REV. 0

PIN CONFIGURATIONS

48-Lead SSOP

(RS Suffix)

SSM2005

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

V

ACOM AUDIO GND

GND

V
(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

EE

CC

1
2
3
4
5
6
7
8

9
10
11

SSM2005

12

TOP VIEW

13

(Not to Scale)

14
15
16
17
18
19
20
21
22
23
24

48

CENTER OUT

47

LF OUT

46

RF OUT

45

LS OUT

44

RS OUT

43

NOISE IN

42

NOISE OUT

41

LOAD

40

RESET

39

DATA IN

38

V

CC

37

ACOM AUDIO GND

36

GND

35

V

EE

34

WRITE

33

CLOCK IN

32

FRONT/REAR TC FILTER

31

LOW BAND TC FILTER

30

HIGH BAND TC FILTER

29

FRONT/REAR DET.

28

FRONT/REAR (L–R) DET.

27

FRONT/REAR (L+R) DET.

26

AUTOBALANCE LOCKOUT

25

AUTOBALANCE TC

–5–REV. 0