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DATASHEET
May 2004
Revision 2.2
1/95
STV82x6
Multistandard TV Audio Processor
and Digital Sound Demodulator
This device incorporates the
SRS (Sound Retrieval
System) under licence from
SRS Labs, Inc.
Key Features
NICAM, AM, FM Mono and FM 2 Carrier
Stereo Demodulators for all sound carriers
between 4.5 and 7 MHz
Mono input provided for optimum AM
Demodulation performances
Demodulation controlled by Automatic
Standard Recognition System
Sound IF AGC with wide range
Overmodulation and Carrier Offset recovery
Smart Volume Control
5-band Equalizer & Bass/Treble Control
Automatic Loudness Control
Loudspeaker and Headphone outputs with
Volume/Balance Controls and Beeper
Subwoofer output with Volume Control and
Programmable Bandwidth
Spatial Sound Effects (ST WideSurround and
Pseudo-Stereo)
SRS
3D Surround
3-to-2 Analog Stereo Audio I/Os (SCART
compatible) with Audio Matrix
Low-noise Audio Mutes and Switches
IS Output to interface with Dolby
Pro
Logic
Decoder
IC Bus-controlled
Single and standard 27 MHz Crystal
Oscillator
Power supplies: 3.3 V Digital, 5 V or 8 V
Analog
Embedded 3.3 V Regulators
Packages: SDIP56 or TQFP80
Audio
AGC
Audio
A/D
A/D
SD
A
SC
L
SIF
AI1L
AI1R
LSL
LSR
SW
Matrix
AI2L
AI2R
AI3L
AI3R
Input
Stereo
MONOIN
Multi-Standard
Demodulator
Digital
Audio
Matrix
Analog
S
o
ur
c
e
P
r
epr
oc
e
s
s
i
ng
FM, AM, A2
and NICAM
Loudspeaker Audio Processing
Smart Volume Control, ST WideSurround,
5-band Equalizer and Loudness,
Headphone Audio Processing
Smart Volume Control,
Beeper and Subwoofer Output
Bass/Treble and Beeper
IS Interface
Audio
Stereo
D/A
Audio
Stereo
D/A
Audio
Stereo
D/A
Vol./
Low Noise
Audio Mute
1V
rms
HPL
HPR
Low Noise
Audio Mute
1V
rms
SC
K
SD
O
WS
IC Interface
Gain
Audio
Matrix
Output
Analog
Low Noise
Audio Mute
Low Noise
Audio Mute
2V
rms
2V
rms
AO1L
AO1R
AO2L
AO2R
IRQ
ST
BU
S0
BU
S
1
HP
D
0.5V
rms
2V
rms
2V
rms
2V
rms
Single Crystal
Clock Generation
Audio Matrixing
Audio Processing
Demodulation
XT
I
XT
O
Power Supply Management
DC Regulators, Standby mode
IC Bus Expander
In
p
u
t
S
CART
s
Sound IF
O
u
t
p
u
t
S
car
t
s
Headphone
Subwoofer
Loudspeaker
Headphone
Detection
Mono In
St
e
r
e
o
Inter
r
up
t
STV82x6
Digital Stereo
R
e
ques
t
Fl
a
g
S
t
er
eo
Fl
a
g
Bal.
Vol./
Bal.
STV82x6
2/95
Table of Contents
Chapter 1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1
Overview .............................................................................................................................. 5
1.2
Typical Applications ......................................................................................................... 5
1.3
I/O Pin Description ............................................................................................................... 8
Chapter 2
Demodulator Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.1
Digital Demodulator ............................................................................................................ 10
2.2
System Clock ..................................................................................................................... 14
Chapter 3
Audio Processor Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.1
Main Features .................................................................................................................... 15
3.2
Smart Volume Control (SVC) ............................................................................................. 16
3.3
ST WideSurround ............................................................................................................... 17
3.4
5-Band Audio Equalizer ..................................................................................................... 17
3.5
Bass/Treble Control ........................................................................................................... 17
3.6
Volume/Balance Control .................................................................................................... 18
3.7
Automatic Loudness Control .............................................................................................. 20
3.8
Subwoofer Control ............................................................................................................. 20
3.9
Beeper ................................................................................................................................ 20
3.10
SRSTM 3D Surround (STV8226/36 only) ............................................................................ 21
Chapter 4
Audio Matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.1
Input Audio Matrix .............................................................................................................. 24
4.2
Output Audio Matrix ........................................................................................................... 24
Chapter 5
Additional Controls and Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.1
Interrupt Request ............................................................................................................... 25
5.2
IC Bus Expander ............................................................................................................... 25
5.3
Stereo Flag ......................................................................................................................... 25
5.4
Headphone Detection ........................................................................................................25
Chapter 6
IS Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3/95
STV82x6
Chapter 7
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
7.1
Supply Voltages ................................................................................................................. 27
7.2
Standby Mode .................................................................................................................... 28
Chapter 8
IC Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
8.1
IC Address and Protocol ...................................................................................................29
8.2
STV82x6 Reset .................................................................................................................. 29
Chapter 9
Register List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
9.1
IC Register Map ................................................................................................................ 31
9.2
STV82x6 General Control Registers .................................................................................. 35
9.3
Analog Block ...................................................................................................................... 37
9.4
Clocking ............................................................................................................................. 39
9.5
Demodulator ....................................................................................................................... 41
9.6
Demodulator Channel 1 ..................................................................................................... 44
9.7
Demodulator Channel 2 ..................................................................................................... 47
9.8
NICAM Registers ............................................................................................................... 53
9.9
Zweiton ............................................................................................................................... 54
9.10
Sound Preprocessing and Selection Registers .................................................................. 55
9.11
Automatic Standard Recognition ........................................................................................ 62
9.12
Smart Volume Control ........................................................................................................ 66
9.13
Surround ............................................................................................................................ 68
9.14
5- Band Equalizer ............................................................................................................... 70
9.15
Loudness/Bass & Treble ....................................................................................................72
9.16
Volume/Balance Control Registers .................................................................................... 74
9.17
Subwoofer .......................................................................................................................... 77
9.18
Beeper ................................................................................................................................ 78
Chapter 10
Input/Output Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Chapter 11
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
11.1
Absolute Maximum Ratings .............................................................................................. 84
11.2
Thermal Data .................................................................................................................... 84
11.3
Supply ................................................................................................................................ 84
11.4
Crystal Recommendations ................................................................................................ 85
STV82x6
4/95
11.5
Analog Sound IF Signal Recommendations ..................................................................... 85
11.6
SIF to LS/HP/SCART Path Characteristics ....................................................................... 86
11.7
SCART to SCART Analog Path Characteristics ............................................................... 86
11.8
SCART to I2S Output Path (via ADC) Characteristics ...................................................... 87
11.9
MONOIN to ADC and I2S Output Path Characteristics .................................................... 87
11.10
I2S to LS/HP/SW Path Characteristics ............................................................................. 87
11.11
I2S to SCART Path Characteristics .................................................................................. 88
11.12
Loudspeaker and Headphone Volume Control Characteristics ........................................ 88
11.13
MUTE Performance ........................................................................................................... 88
11.14
Digital I/Os ......................................................................................................................... 88
11.15
IC Bus Interface .............................................................................................................. 89
Chapter 12
Package Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
Chapter 13
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
5/95
STV82x6 General
Description
1
General Description
1.1
Overview
The STV82x6 is composed of three main parts:
1.
TV Sound Demodulator: provides all the necessary circuitry for the demodulation of audio
transmissions of European and Asian terrestrial TV broadcasts. The various transmission
standards are automatically detected and demodulated without user intervention.
2.
Audio Processor: based on DSP technology, independently controls loudspeaker, subwoofer
and headphone signals. It offers basic and advanced features, such as a ST WideSurround,
Equalizer, Automatic Loudness and Smart Volume Control for television viewer comfort. The
STV8226/36 versions can perform additionally the SRS
3D Surround for stereo and mono
signals.
3.
Audio Matrix: 3 stereo and 1 mono external analog audio inputs to loudspeakers and
headphone, with 2 stereo external analog audio outputs (SCART compatible).
1.2
Typical Applications
Table 1: STV82x6 Version List
Feature
STV8206
STV8216
STV8226
STV8236
AM-FM Mono
X
X
X
X
Zweiton
X
X
X
X
NICAM
X
X
ST WideSurround
X
X
X
X
SRS
3D Surround
X
X
Figure 1: Package Ordering Information
Figure 2: Typical Application (Low-cost Stereo TV)
SDIP56 Package
Order Code: STV82x6D
TQFP80 Package
Order Code: STV82x6 (Tray)
STV82x6T (Tape & Reel)
STV82x6
TV Sound Demodulation
and Audio Processing
Cable and Terrestrial
Analog TV Tuner
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