SSM-2126 ,Dolby Pro-Logic Surround Matrix DecoderGENERAL DESCRIPTION
The SSM-2125 and SSM-2126 are Dolby' Pro-Logic Surround
Decoders developed ..
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START405TR ,NPN SILICON RF TRANSISTORSTART405NPN Silicon RF Transistor• LOW NOISE FIGURE: NFmin = 1.1dB @ 1.8GHz, 2mA, 2V• COMPRESSION ..
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SSM-2126
Dolby Pro-Logic Surround Matrix Decoder
ANALOG
DEVICES
Dolby Pro-Logic
Surround Matrix Decoder
Sull-21 25/SSM-21 26
FEATURES
Noise Generator and Autobalance Circuits are Con.
tained On-Chip
Autobalance On/Off Control
4-Channel Pro-Logic and Dolby 3 (Surround Channel
Defeat) Modes Available
Selectable Center Channel Modes-Normal, Wideband,
Phantom, Off
Direct Path Bypass (Normal 2-Channel Stereo Model
Wide Channel Separation
Center to Left, Right Channels-35 dB min
(SSM-2125)
Any Channel to Another-25 dB min (SSM-2126)
Wide Dynamic Range-103 dB typ
Low Total Harmonic Distortion-0.02% typ
Available in a 48-Pin Plastic DIP
CMOS and TTL Compatible Control Logic
APPLICATIONS
Direct View and Projection TV
Integrated A/V Amplifiers
Laserdisc and CD-V Players
Video Cassette Recorders
Stand-Alone Surround Decoders
Home Satellite Receiver/Descramblers
GENERAL DESCRIPTION
The SSM-2125 and SSM-2126 are Dolby" Pro-Logic Surround
Decoders developed to provide multichannel outputs from
Dolby Surround encoded stereo sources.
Over 2000 major films and an increasing number of broadcasts
are available in Dolby Surround. Surround encoding is pre-
served in the stereo audio tracks of normal video discs, video
cassettes, and television broadcasts, permitting the decoding to
multichannel audio in the home,
Major design considerations of the SSM-2 125/SSM-2126 are ex-
cellent audio performance and a high level of integration, In ad-
dition to the Adaptive Matrix and Center Mode Control, also
included on-chip are the Automatic Balance Control and Noise
Generator functions. A complete Pro-Logic system can be real-
ized using the SSM-2125/SSM-2126 and few external compo-
nents. Using SSM's extensive experience in the design of
professional audio integrated circuits, the SSM-2125/SSM-2126
offers typical 103 dB dynamic range and 0.025% THD. A direct
path bypass mode allows normal stereo operation with high fi-
delity without the need for external switching or parallel signal
paths.
The SSM-2125 is a premium grade that is selected to a mini-
mum channel separation specification of 35 dB for the center to
left and right channels, and 25 dB for the remaining channels.
The standard grade, the SSM-2126, provides minimum channel
separation of 25 dB from any channel to another.
The SSM-2 125/SSM-2126 is available only to licensees of Dolby
Licensing Corporation, San Francisco, California, from whom
licensing and application information must be obtained.
FUNCTIONAL BLOCK DIAGRAM
METERS
INPUTS i" ---.----- - -------------------- 1 OUTPUTS
LEFT o4- -------0- = -o LEFT
I AUTO- ADAPTIVE c CENTER ! C MASTER CENTER
----V r -o
I BALANCE, MATRIX n MODE l R LEVEL
I BUFFERS ----v CONTROL I s - CONTROL -o RIGHT
RIGHT "t I -o SURROUND
l S SSM-2125/SSM-2126 ,
I t" - - - --------_ I
I NOISE I
I GENERATOR l ANTI- AUDIO - 7kHz _ MODIFIED
I I ALIAS DELAY LOW-PASS B.TYPE
I ----------- FILTER FILTER DECODER
"Dolby is a registered trademark of Dolby Laboratories Licensing Corpora-
tion, San Francisco, California.
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.
One Technology Way, PO. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703 Twx: 710/394-6577
Telex: 924491 Cable: ANALOG NORWOODMASS
SSN-Ill 25/Ss#l-21hi- SPECI F ICATIONS (kc/f/l,' 3350:3232: "ecsl,te,2itse1 $0121.)
SSM-2125 SSM-2126
Parameter Symbol Conditions Min Typ Max Min Typ Max Units
CHANNEL SEPARATION
Center C Input; R, L Outputs 35 48 25 35 dB
C Input; s Output 25 35 25 35 dB
Right R Input; L, C, S Outputs 25 35 25 35 dB
Left L Input; C, R, S Outputs 25 35 25 35 dB
Surround s Input; L, R, C Outputs 25 35 25 35 dB
CHANNEL OUTPUT LEVEL VIN = 0 dB; L, R, C, S Output t0.5 :0.5 dBd
TOTAL HARMONIC
DISTORTION THD All Channels 0.02 0.1 0.02 0.1 %
SIGNAL-TO-NOISE RATIO SNR VIN - 0 V, CCIR2K/ARM
All Channels -83 -87 -80 -87 dBd
HEADROOM HR Clipping = 3% THD
All Channels 15 16 15 16 dBd
BYPASS MODE '
DYNAMIC RANGE Clipping to Noise Floor 104 104 dB
NOISE SOURCE
OUTPUT LEVEL All Channels - 13.5 - 13.5 dBd
NOISE SOURCE OUTPUT
LEVEL MATCHING Any Channel to Another 1 1 dB
AUTOBALANCE
CAPTURE RANGE t3 :3 8 t6 t3 8 dB
LOGIC THRESHOLD HI Relative to LREF +2.4 +2.4 V
LO +0.8 +0.8 V
OPERATING SUPPLY
VOLTAGE VS Single Supply + 12 + 12 V
Dual Supply tti t6 V
SUPPLY CURREN T ISY No Input Signal 40 50 40 50 mA
INPUT IMPEDANCE ZIN L, R Inputs 5 5 k0
OUTPUT IMPEDANCE ZOUT L, R, C, S Outputs 600 600 ft
'0 dBd _ 500 mV rms Dolby level output at any channel; Left and Right inputs: 500 mV rms (0 dBd); Center input: L = R = 354 mV rms (-3 dBd);
Surround input: L = -ft = 354 mV rms ( 3 dBd).
ABSOLUTE MAXIMUM RATINGS ORDERING GUIDE
Supply Voltage .................... +16 V or t8 V
Logic Inputs .......................... V+ to V- Temperature Package
Storage Temperature Range ........... -55''C to + 125°C Model Range Option
Operating, Temperature Range ........... -2(y'C to +70T SSM2125XXXP* -200C to +70T 48-Pin P-DIP
Junction Femperature ....... . ............... +150 C SSM2126XXXP* _200C to +70%: 48-Pin P-DIP
Lead T emperature Range (Soldering, 60 sec) ....... +300°C
Thermal Resistancel NOTE
0 .............................. 38°C/W *The SSM-2125/SSM-2126 is available only to licensees of Dolby Laborato-
ill 14°C/W ries. Each customer will be assigned a special part number for ordering pur-
JC l...-........................ poses. Contact local ADI sales office for further details.
lih, is specified for worst case mounting conditions, i.e., device in socket.
REV. O
SShll-21fl5/SSlil-212ii
Table I. External Component List PIN CONNECTIONS
Comment (Noncritical -
Component Value Tolerances Unless Otherwise Noted) CT5 l: q U 43 cu
g g: E: CTI [T 47 CT3
C3 680 pF Vner E 46 CT6
C4 0.1 WF V+ E 45 crwn
cs 0.1 “F
C6 680 pF CT4 E E CFWL
C7 4.7 wF 20% Standard Electrolytic CAB E 43 CFWC
C8 0.22 “F RT E 42 crws
C9 0.22 wF
cm 0.33 WF Film LT E E BPLm
C11 0.33 wr Film L." E 40 ACL2
C12 0.33 WF Film R E 39 CL1
C13 0.33 WF Film IN A
CM 22 nF Film Nm E 55353-22112: E Vreer
C15 22 HF Film .
C16 22 nF Film NC E TOP VtEW El BPRm
C17 22 nF Film V- CE (Notto Scale) E ACR2
C18 0.1 pF Mom 14 El ACR1
gig 3320:} 20% Standard Electrolytic VREF LE M ACC2
C21 0.22 wF (W LE ca ACCt
C22 10 4 20% Standard Electrolytic DM2 E 32 ACS2
C23 - - Not Needed
C24 10 nF DM3 E 31 mm
C25 10 nF DM4 [E E Sour
C26 10 nF . cm [E 29 cm
C27 100 WF >100 WF Standard Electrolytic
C28 0.10F CM2 E 28 CC2
C29" 100 WF >100 HF Standard Electrolytic LREF FE 27 v-
C30'* 0.1 WF VRO E El
C31 100 " 2100 WF Standard Electrolytic “OUT
C32 0.1 p.F Low FE E Cour
R1 15 kn 5%
R2 47 kfl 5% NC -No CONNECT
R3 15 kn 5%
R4 47 kn 5%
R5 7.5 kn 5%
R6 7.5 kft 5%
R7 - - Not Needed
R8 - - Not Needed
R9 22 kil 5%
R10 22 kn 5%
R1 1 10 lift 5%
R12 22 kn 5%
*10% unless otherwise indicated.
"Used only in Dual Supply Application Circuit.
REV. O -3-
$$l9-2125/SShd-2128
PIN DESCRIPTION
Function
Pin ' Name
3 V’REF
10 RIN
11 NIN
14 NOUT
15 VREF
16 DMI
17 DM2
18 DM3
19 DM4
20 CMI
21 CM2
22 LREF
23 VRO
24 LOUT
25 Cova,
26 Row
28 CC2
29 CCI
30 Sour
31 ACSl
32 ACS2
33 ACCl
34 ACC2
35 ACRl
36 ACR2
37 BPRIN
38 VREF
Long Time Constant, C/S
Short Time Constant, L/R Comparators
Reference Voltage: Ground or Pseudoground
Positive Supply
Short Time Constant, C/S Comparators
Autobalance Time Constant
Buffered, Autobalanced Right Channel Signal
Buffered, Autobalanced Left Channel Signal
Left Channel Input
Right Channel Input
Filtered Noise Input
Do Not Connect
Negative Supply (Ground in Single Supply)
Noise Output
Reference Voltage: Ground or Pseudoground
Digital Operating-Mode Control Input
Digital Operating-Mode Control Input
Digital Operating-Mode Control Input
Digital Operating-Mode Control Input
Digital Center-Mode Control Input
Digital Center-Mode Control Input
Logic Reference Voltage
(Threshold = LREF + 1.4 V)
VREF Out-Pseudoground Output
Left Channel Output
Center Channel Output
Right Channel Output
Negative Supply (Ground in Single Supply)
Center Normal-Mode Filter Input (Z = 15 KO)
Center Normal-Mode Filter Output
Surround Channel Output
Surround Channel Steering Signal
AC Coupling and High-Pass Filter
Surround Channel Steering Signal
AC Coupling and High-Pass Filter
Center Channel Steering Signal
AC Coupling and High-Pass Filter
Center Channel Steering Signal
AC Coupling and High-Pass Filter
Right Channel Steering Signal
AC Coupling and High-Pass Filter
Right Channel Steering Signal
AC Coupling and High-Pass Filter
Filtered Right Channel Input to Steering
Signal Generator
Reference Voltage: Ground or Pseudogmund
Pin ' Name Function
39 ACLl Left Channel Steering Signal AC Coupling
and High-Pass Filter
40 ACL2 Left Channel Steering Signal AC Coupling
and High-Pass F ilter
41 BPLIN Filtered Left Channel Input to Steering
Signal Generator
42 CFWS Surround Channel Full-Wave Rectifier
Low-Pass F ilter
43 CFWC Center Channel Full-Wave Rectifier
Low-Pass Filter
44 CFWL Left Channel Full-Wave Rectifier
Low-Pass Filter
45 CFWR Right Channel Full-Wave Rectifier
Low-Pass Filter
46 CT6 Short Time Constant, CIS
47 CT 3 Short Time Constant, L/R
48 CT2 Long Time Constant, L/R
REV. 0
SSM-2125/SSM-2126
SSH-ZlZS/ZIZB ' Center, Surround Distortion ZZiz-Zaldiz THIMKZ) " mlltriz)
SSH-2125 .' Center Channel Normal Mode Response MPLUBr) vs FREQtHz)
1.3553 " -
CENTER
(WIDE).
-1353 'i, _.. _.. _
-aai--,
-a.eaa -
AMN - Tr__ .
-5335 (.rr.rr_ ___ " i'
1 ) LEFT _ ii ; g g
-7,N8 _ . _,': \(CENTER NORMAL) _ _:,') "-i..:
28 188 1k 18k Nk
Figure I. THD+N vs. Frequency,' Center and Surround
Channels (V,N = 0 dBd, H, = 100 k0)
Figure 3. Bass-Splitting Filter Response (Center Channel
Normal and Wide Modes)
SSH-ZlZS/ZIZB , Left. Right Distortion i2ltz-NUtt MRSW.) " FHEUIHZ)
:i: Ap _
L-BPBQ
mma} L,HBYPAs§i;m
a_ms 'ir. F-, ol...d..j. i , I, I. ___ ii... _ _ . T ._.
m IN 1k 18k Nk
SSH-ZlZS/Zm l Headroon 1111).sz us Mniar)
CENTER
8.818 SURROUND
8.8 2.8% 1.888 6.8m 8m 18% 12.w 11.88 16.88 18.88 28m
Figure 2. THD+N vs. Frequency,' Left and Right Channels
(VW = 0 dBd, RL = 100 kt)
*80 kHz low-pass filter used for Figures 1 and 2,
REV. 0
Figure 4. Headroom THD+N vs, Amplitude (0 dBr =
0 dBd = 500 mV rms)
