SSM2005-SSM2005RS-REEL Fast Delivery |IC PHOENIX CO.,LIMITED

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SSM2005-SSM2005RS-REEL
Decoder 5.1-Channel Soundfield Generator
REV.0 Decoder
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
Figure 1.Simplified Block Diagram
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 compat-
ible with encoded sources, such as Dolby ProLogic® and Circle
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.
SSM2005–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
DYNAMIC PERFORMANCE␣
NOISE GENERATOR␣
AUTOBALANCE
CONTROL LOGIC␣
POWER SUPPLIES␣
NOTES0 dBd = 300 mV rms.With filter shown in Figure 8.Specifications apply for VS = –6 V.
Specifications subject to change without notice.
(VS = –6.0 V, TA = 1258C, f = 2 kHz, Modes: Video, 5-2-5, Center On, Sound Spread Off,
Autobalance Off, Noise Off)
LICENSING INFORMATION
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage, VS . . . . . . . . . . . . . . . . . . . . . .–8 V or +16 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VS
Storage Temperature Range . . . . . . . . . . . .–65°C to +150°C
Operating Temperature Range . . . . . . . . . . .–20°C to +70°C
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 condi-
tions for extended periods may affect device reliability.
NOTEqJA is specified for worst case conditions.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V 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.
ORDERING GUIDE
SSM2005
FREQUENCY – Hz
0.012020k100
THD + N – %
10k
Figure 2.THD + N vs. Frequency; Front Channels
FREQUENCY – Hz
0.012020k100
THD + N – %
10k
Figure 3.THD + N vs. Frequency; Surround Channels
AMPLITUDE – dBr A
0.01
23515225
THD + N – %
0.1
215255
Figure 4.THD + N vs. Amplitude; Front Channels
FREQUENCY – dBr A
0.01
23515225
THD + N – %
0.1
215255
Figure 5.THD + N vs. Frequency; Surround Channels
–Typical Performance Characteristics
PIN CONFIGURATIONS
48-Lead SSOP
(RS Suffix)
CENTER OUTR 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
VEE
ACOM AUDIO GND
GND
VCC
(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
VCC
ACOM AUDIO GND
GND
VEE
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
SSM2005
PIN FUNCTION DESCRIPTION
Table I.Abbreviations and Notations Used in the Text
SIMPLIFIED THEORY OF OPERATION
General
The SSM2005 Circle Surround decoder processes stereo input
signals, and outputs 5 channels of surround sound, plus an L+R
output for a subwoofer low-pass filter. The SSM2005 provides
signal processing, steering control, input autobalance, and a digital
interface for mode control. This device uses analog circuits such as
amplifiers, rms detectors, VCAs and digital logic to carry out the
circle surround algorithm in real time. No artificial reverberation
or delay effects are used, preserving the natural sound of the
original stereo recording.
The SSM2005 can decode any existing media including CD,
VCD, DVD, cassette tapes, VHS, FM radio and television stereo
broadcasts. For convenience in balancing the system, an on-chip
digital noise generator is available. The net result is outstanding
5.1 channel surround sound from all stereo sources, which re-
veals the hidden ambiance already contained in existing music
and cinematic recordings. The listening experience is greatly
enhanced and made more enjoyable when compared to ordinary
stereo. In the following description, please refer to Figure 6.
Input Signal Processing
Stereo inputs L and R are fed to both the Steering Control
Generator, and the Autobalance circuitry. The balanced signals
are passed through the Center Channel Cancel circuitry to the
Channel Steering VCAs.
The autobalance output signals also feed the Precision Sum and
Difference Amplifiers. The sum (L+R) and difference (L–R)
signals form the basis for the center and surround channels,
respectively. The center channel signal is fed to the center chan-
nel cancel circuitry, and to the channel steering VCAs. The
surround channel signal is separated by an external Crossover
Network into the Surround High and Surround Low bands and
fed to the channel steering VCAs.
Steering Control Generator
The purpose of the steering control generator is to analyze the dy-
namic characteristics of music, dialog, or special effects, using pro-
prietary high speed analog computing circuits. Control voltages for
all VCAs are then computed, and the soundfield expansion per-
formed in accordance with the circle surround decoding algorithm.
The control signals depend upon the SSM2005 modes selected, and
will differ for video mode vs. music mode, 5.2.5 mode vs. 4.2.4
mode, etc.
Channel Steering VCAs
Command signals from the steering control generator are fed to
the channel steering VCAs, which control the amplitude of the
five output channels. High performance, low distortion VCAs
with typically 12 dBd headroom are used for all channels.
Output Amplifier
The Output Amplifiers receive signals from the VCAs and the
internal Noise Generator. Each amplifier has a multiplexer switch
which will enable it to output a white noise waveform under
control of the Serial Bus. This simplifies balancing of the listening
system. The output amplifiers provide load drive capability with
typically 12 dBd of headroom. The overall gain from L and R
inputs to Circle Surround Outputs is unity; the Noise Generator
gives an output level of –10 dBd (100 mV rms).
Mode Control Logic
The various SSM2005 modes are shown in Figure 7. There are
modes for different types of source material, such as video sound
tracks or music. Other modes include 5.2.5/4.2.4, Sound Spread,
Phantom Center mode, autobalance, and Noise Generation. Each
mode’s status is stored in the Mode Control Logic, as determined
by the data sent via the serial bus. Refer to the Typical Outputs In
Various Modes section for a more detailed explanation of the vari-
ous modes.
Applying a logic low to the Reset input will override the Mode
Control Logic and put the SSM2005 into its Default mode. De-
fault modes for the device are video/5.2.5/center active/sound
spread on/autobalance on/noise off. See Figure 9 for logic timing
diagrams.
Autobalance Feature
The autobalance circuitry is activated when the SSM2005 is placed
into autobalance On Mode. In this mode, the device will adjust the
gains of its input amplifiers to balance the stereo inputs to equal
loudness. With a mono input signal, the autobalance circuitry will
typically balance L and R to within –0.5 dB. A 22 mF external ca-
pacitor connected to Pin 25 sets a 5 second averaging period for
comparing the levels between the stereo inputs.
Using autobalance will slightly degrade the maximum channel
separation from the SSM2005. The autobalance mode can be
left off without fear of degrading the soundfield, unless the
stereo input signal is expected to be off balance by more than1.5 dB. Most CD, VCD and DVD player outputs are specified
to within –0.25 dB balance.
Noise Generator
When the noise mode is selected, the audio inputs are muted.
Noise will be available from the output of the channel determined
by the mode control logic. The noise generator uses a feedback
shift register that generates a pseudo-random digital output wave-
form with a repeat time of three seconds. This digital noise wave-
form is band-pass filtered externally to approximate white noise.
Power Supplies
The SSM2005 may be operated from regulated –5 V to –6 V
supplies that can supply 45 mA each. The recommended operating
voltage is – 6 V, which will give a typical headroom of 12 dBd.
SSM2005
Power-Up
The SSM2005 will be in an undefined mode on power-up. Reset
should be applied to the SSM2005, or the mode control logic
should be loaded to put the device into a definite mode state.
Serial Data Control Inputs
The SSM2005 provides a simple 3- or 4-wire serial interface to
control the mode settings for the device. Data is input on the
DATA IN pin, while CLOCK IN is the serial clock. Data can be
shifted into the SSM2005 at clock rates up to 1 MHz.
STEREO
INPUTS
AMPLIFIERS
CIRCLE
SURROUND
OUTPUTS
RESET
CLOCK
SELECT
LOAD
SERIAL BUSGND2VACOM
INPUT POWER
DATA
FILTER
Figure 6.Block Diagram
The shift register clock at CLOCK IN is enabled when theWRITE input is low. The WRITE pin can therefore be used as a
chip select input. However, the shift register contents are not
transferred into the register banks until the rising edge of LOAD.
For a traditional 3-wire serial interface, WRITE and LOAD
should be tied together. Figure 7 shows the timing diagram and
minimum timing requirements for the digital interface.
To enable a data transfer, the WRITE and LOAD inputs are
driven low. The 8-bit serial data, formatted MSB first, should
be fed to DATA IN and clocked into the shift register on the
rising edge of CLOCK IN. The new mode setting will then
activate on the rising edge of WRITE and LOAD.
Table II.Modes List

Partno	Mfg	Dc	Qty	Available	Descript
SSM2005RS-REEL \|SSM2005RSREEL	AD	N/a	6950	avai	Decoder 5.1-Channel Soundfield Generator
SSM2005	AD	N/a	2	avai	Decoder 5.1-Channel Soundfield Generator