ST STV8207 User Manual

STV8207

®	STV82x7
	Digital Audio Decoder/Processor
	for A2 and NICAM Television/Video Recorders
	PRELIMINARY DATA

Key Features

■Full-Automatic Multi-Standard Demodulation

●B / G / I / L / M / N / D / K Standards

●Mono AM and FM

●FM 2-Carrier (German and Korean Zweiton) and NICAM

■Multi-Channel Capability

●3 I²S digital inputs, S/PDIF (in/out)

●5.1 analog outputs

●Dolby→ Pro Logic→

●Dolby→ Pro Logic II→

■Sound Processing

●ST royalty-free processing: ST WideSurround, ST OmniSurround, ST Dynamic Bass, SRS→ WOW™, SRS→ TruSurround XT™ which is Virtual Dolby→ Surround and Virtual Dolby→ Digital compliant

●Independent Volume / Balance for Loudspeakers and Headphone

●Loudspeakers: Smart Volume Control (SVC), 5-band equalizer and loudness

●Headphone: Smart Volume Control (SVC), BassTreble, Loudness and SRS→ TruBass™

■Analog Audio Matrix

●4 stereo inputs

●3 stereo outputs

●THRU mode

■Audio Delay for Audio Video Synchronization

●Embedded stereo delay up to 120 ms for lip-sync function (up to 180 ms for tuner input)

●Independent delay on headphone and loudspeaker channels

Virtual or true, multi-channel capabilities and easy digital links make them ideal for digital audio low cost consumer applications. Starting from enhanced stereo up to independent control of 5 loudspeakers and a subwoofer (5.1 channels), the STV82x7 family offers standard and advanced features plus sound enhancements, spatial and virtual effects to enhance television viewer comfort and entertainment.

Typical Applications

●Analog and digital TV with virtual surround sound

●Analog and digital TV with multi-channel surround sound

●DVD and HDD recorders

●“Palm size” portable TV

	7
x
2
8
V
T
S

♥ 2004 SRS Labs, Inc. All rights reserved, SRS and

the SRS logo are registered trademarks of SRS Labs, Inc.

The STV82x7 family, based on audio digital signal processors (DSP), performs high quality and advanced dedicated digital audio processing.These devices provide all of the necessary resources for automatic detection and demodulation of analog audio transmissions for European and Asian terrestrial TV broadcasts.

“Dolby”, “Pro Logic”, and the double-D symbol are trademarks of Dolby Laboratories.

	Rev. 3
February 2005	1/149

2/149

IRQ

Headphone

Control

Detection

Logic

Sound IF

SIF

AGC

A/D

Mono Input

MONO_IN

SC1_IN_L

SC1_IN_R

SC2_IN_L

Input

SC2_IN_R

Analog

SC3_IN_L

Audio

Matrix

SC3_IN_R

SC4_IN_L

SC4_IN_R

SCART

Inputs

I²S

data

clocks

I²S

Interface

Digital

FM/AM

NICAM

FM 2-carrier

Demodulation

Audio

A/D

I²C

Interface

SCL SDA

I²C

S/PDIF

In / Out

	scaler-Pre				Matrix Audio Digital

Loudspeakers

Digital Audio Processing

Volume, Equalizer, Balance,

Dolby→ Pro Logic→

Dolby→ Pro Logic II→,

ST WideSurround, ST Dynamic Bass,

ST OmniSurround,

Loudness,Smart Volume Control,

Bass Management, Beeper SRS→ WOW™ or TruSurround XT™

Headphone

Digital Audio Processing

Volume, Balance, Loudness,

Smart Volume Control,

Bass/Treble, SRS→ Trubass™

Stereo

Audio

DAC

				Clock							Power Supply
			Generator								Management
	CLK SEL				XTALIN			XTALOUT

Loudspeakers

LS_L

LS_R

LS_C

Stereo

0.9 VRMS

Audio

LS_SUB

DAC

Headphone / Surround

Stereo

0.9 VRMS

HP_LSS_L

Audio

HP_LSS_R

DAC

		SC1_OUT_L
	2 VRMS	SC1_OUT_R
Output		SC2_OUT_L
Analog	2 VRMS	SC2_OUT_R
Audio
Matrix
		SC3_OUT_L
	2 VRMS	SC3_OUT_R
		SCART
		Outputs

Diagram Block

STV82x7

STV82x7

Table of Contents

Chapter 1	General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . .6
1.1	STV82x7 Overview ..............................................................................................................		8
	1.1.1	Core Features ............................................................................................................................................	8
	1.1.2	Software Information .................................................................................................................................	9
	1.1.3	Device Input Modes ...................................................................................................................................	9
	1.1.4	Electrical Features ...................................................................................................................................	10
1.2	Typical Applications ...........................................................................................................		10
1.3	Pin Descriptions and Application Diagrams .......................................................................		14
Chapter 2	System Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. .20
Chapter 3	Digital Demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. .21
3.1	Sound IF Signal ..................................................................................................................		21
3.2	Demodulation .....................................................................................................................		22
Chapter 4	Dedicated Digital Signal Processor (DSP) . . . . . . . . . . . . . . . . . . . . . . . . . . .		. .24
4.1	Back-end Processing .........................................................................................................		24
4.2	Audio Processing ...............................................................................................................		25
4.3	ST WideSurround ...............................................................................................................		28
4.4	ST OmniSurround ..............................................................................................................		28
4.5	Dolby Pro Logic II Decoder ................................................................................................		28
4.6	Bass Management .............................................................................................................		28
	4.6.1 Bass Management Configuration 0 .........................................................................................................		29
	4.6.2 Bass Management Configuration 1 .........................................................................................................		30
	4.6.3 Bass Management Configuration 2 .........................................................................................................		31
	4.6.4 Bass Management Configuration 3 .........................................................................................................		32
	4.6.5 Bass Management Configuration 4 .........................................................................................................		33
4.7	SRS WOW and TruSurround XT ......................................................................................		33
	4.7.1	SRS TruSurround ....................................................................................................................................	33
	4.7.2	SRS WOW ...............................................................................................................................................	34
4.8	Smart Volume Control (SVC) .............................................................................................		34
4.9	ST Dynamic Bass ..............................................................................................................		35
4.10	5-Band Audio Equalizer .....................................................................................................		35
4.11	Bass/Treble Control ...........................................................................................................		35
4.12	Automatic Loudness Control ..............................................................................................		36
4.13	Volume/Balance Control ....................................................................................................		36
4.14	Soft Mute Control ...............................................................................................................		37
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		STV82x7
4.15	Beeper ................................................................................................................................	37
Chapter 5	Analog Audio Matrix (In / Out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . .39
Chapter 6	I²S Interface (In / Out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . .40
6.1	I²S Inputs ............................................................................................................................	40
6.2	I²S Output ...........................................................................................................................	41
Chapter 7	S/PDIF Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . .42
Chapter 8	Power Supply Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . .43
8.1	Standby Mode (Loop-through mode) .................................................................................	43
Chapter 9	Additional Controls and Flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . .44
9.1	Headphone Detection ........................................................................................................	44
9.2	IRQ Generation ..................................................................................................................	44
9.3	I²C Bus Expander ...............................................................................................................	44
Chapter 10	STV82x7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . .45
Chapter 11	I²C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . .46
11.1	I²C Address and Protocol ...................................................................................................	46
11.2	Start-up and Configuration Change Procedure ..................................................................	47
Chapter 12	Register List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . .48
12.1	I²C Register Map ................................................................................................................	49
12.2	STV82x7 General Control Registers ..................................................................................	55
12.3	Clocking 1 ..........................................................................................................................	56
12.4	Demodulator .......................................................................................................................	59
12.5	Demodulator Channel 1 .....................................................................................................	62
12.6	Demodulator Channel 2 .....................................................................................................	66
12.7	NICAM Registers ...............................................................................................................	71
12.8	Stereo Mode .......................................................................................................................	73
12.9	Analog Control ...................................................................................................................	74
12.10	Clocking 2 ..........................................................................................................................	76
12.11	DSP Control .......................................................................................................................	77
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STV82x7

12.12	Automatic Standard Recognition ........................................................................................	81
12.13	Audio Preprocessing and Selection Registers ...................................................................	85
12.14	Matrixing .............................................................................................................................	93
12.15	Audio Processing ...............................................................................................................	98
12.16	5-Band Equalizer / Bass-Treble for Loudspeakers ..........................................................	112
12.17	Headphone Bass-Treble ..................................................................................................	113
12.18	Volume .............................................................................................................................	116
12.19	Beeper ..............................................................................................................................	126
12.20	Mute .................................................................................................................................	127
12.21	S/PDIF ..............................................................................................................................	128
12.22	Headphone Configuration ................................................................................................	128
12.23	DAC Control .....................................................................................................................	129
12.24	AutoStandard Coefficients Settings .................................................................................	130
Chapter 13	Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.132
13.1	Absolute Maximum Ratings ............................................................................................	132
13.2	Thermal Data ..................................................................................................................	132
13.3	Power Supply Data ..........................................................................................................	132
13.4	Crystal Oscillator .............................................................................................................	133
13.5	Analog Sound IF Signal ..................................................................................................	133
13.6	SIF to I²S Output Path Characteristics .............................................................................	134
13.7	SCART to SCART Analog Path Characteristics ..............................................................	134
13.8	SCART and MONO IN to I²S Path Characteristics ..........................................................	135
13.9	I2S to LS/HP/SUB/C Path Characteristics .......................................................................	135
13.10	I²S to SCART Path Characteristics ..................................................................................	136
13.11	MUTE Characteristics ......................................................................................................	136
13.12	Digital I/Os Characteristics ...............................................................................................	136
13.13	I²C Bus Characteristics ..................................................................................................	137
13.14	I2S Bus Interface ..............................................................................................................	138
Chapter 14	Input/Output Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.140
Chapter 15	Package Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.145
Chapter 16	Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.146
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General Description

STV82x7

1 General Description

The STV82x7 is a multistandard TV sound demodulator and audio processor which integrates

SRS→ WOW™, SRS→ TruSurround XT™, Dolby→ Pro Logic→, Dolby→ Pro Logic II→,Virtual Dolby→ Surround (VDS) and Virtual Dolby→ Digital (VDD) capability.

ST advanced algorithms such as ST OmniSurround, ST WideSurround, ST Dynamic Bass are also available in this audio sound processor. ST OmniSurround is a certified Dolby→ algorithm for the Virtual Dolby→ Digital (VDD) and the Virtual Dolby→ Surround (VDS). When using VDD or VDS, either a Dolby→ Digital or a Pro Logic→ (or Pro Logic II→) decoder is mandatory respectively.

This chip performs automatic multistandard analog TV stereo sound identification and demodulation (no specific I²C programming is required). It offers various audio processing functions such as equalization, loudness, beeper, volume, balance, and surround effects. It provides a cost-effective solution for analog and digital TV designs.

The STV82x7 is perfectly suited to current and future digital TV platforms, based on audio/video digital chips (STD2000, (DTV100 platform) and the future WorldWide iDTV one chip) which include an internal digital decoder (MPEG, Dolby→ Digital...). In the case where a Dolby→ Digital decoder is embedded in the audio/video digital chip, Virtual Dolby→ Digital could be obtained.

For the CTV100/120 platform, the device is offered as an alternative solution to the first-generation chassis that uses the STV82x6.

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STV82x7

General Description

Table 1: STV82x7 Version List

STV8247

STV8257

STV8267

STV8277

STV8287

S

S

S

S

S

S

S

S

S

S

S

T

T

S

T

S

T

S

T

T

T

T

T

S

T

S

T

V

V

T

V

T

V

T

V

V

V

V

V

T

V

T

V

8

8

V

8

V

8

V

8

8

8

8

8

V

8

V

8

2

2

8

2

8

2

8

2

2

2

2

2

8

2

8

2

4

5

2

6

2

7

2

8

0

1

2

3

2

5

2

4

7

7

6

7

7

7

8

7

7

7

7

7

5

7

7

7

D

D

7

D

7

D

7

D

7

D

7

D

S

S

D

S

D

S

D

S

X

X

X

X

X

Demodulation

AM/FM - Mono, FM 2-carrier

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

NICAM

X

X

X

X

X

X

X

X

X

X

X

X

X

X

Multi-Channel Capability

3 x I²S In or 1 I²S Out,

X

X

X

X

X

X

X

X

S/PDIF (Pass-thru)

5.1 Analog Out for Loudspeakers

X

X

X

X

X

X

X

Virtual Dolby→ Surround

X

X

X

X

X

X

X

X

X

X

Virtual Dolby→ Digital capability1

X

X

X

X

X

X

X

X

Dolby→ Pro Logic→

X

X

X

X

Dolby→ Pro Logic II→

X

X

Audio Processing

SRS→ WOW™

X

X

SRS→ TruSurround XT™

X

X

X

X

X

ST Voice, ST Dynamic Bass,

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

ST WideSurround

ST OmniSurround2

X

X

X

X

X

X

X

X

X

X

X

X

1.Virtual Dolby Digital capability is obtained with the use of external Dolby Digital decoder (for example STD05x0).

2.When using VDD or VDS with ST OmniSurround or SRS TruSurround XTTM, either a Dolby→ Digital or a Pro Logic→ (or Pro Logic II→) decoder is mandatory respectively.

Figure 1: Package Ordering Information

Order Code:

STV82x7 (Tray)

STV82x7/T (Tape & Reel)

0 QFP8

T

For Example: STV8257DSX/T will be delivered in Tape & Reel conditioning

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General Description

STV82x7

1.1STV82x7 Overview

1.1.1Core Features

●Single audio source processing:

—IF source and/or analog stereo input (SCART)

—one digital source with a maximum of 6 synchronous channels (5.1 is obtained across three I²S)

●SIF input signal with Automatic Gain Control (AGC)

●Digital Demodulator with automatic standard detection and demodulation for AM, FM mono, FM 2 carriers (German or Korean FM 2-carrier) and NICAM

●Audio processor working at 32 kHz, 44.1 kHz or 48 kHz with specific features:

—For Loudspeakers (L, R, LS, RS, SubW, C):

Dolby→ Pro Logic II → Decoder with Bass Management

SRS→ WOW™ or TruSurround XT™ including Virtual Dolby→ Surround and Virtual Dolby→ Digital

ST WideSurround ST OmniSurround ST Dynamic Bass

5-band Equalizer or Bass-Treble Loudness

Smart Volume Control Volume/Balance/Soft-mute Beeper

Video Processing Delay Compensation

—For Headphone: SRS→ TruBass™ Smart Volume Control Bass-Treble Loudness

Volume/Balance/Soft-mute Beeper

Video Processing Delay Compensation

●Shared outputs for headphone and loudspeakers (surround channels);

●Analog matrix with:

—five external inputs:

four SCART inputs (2 VRMS capable) one analog mono input (0.5 VRMS)

—one internal input from a digital matrix via a DAC

—three external outputs (2 VRMS capable)

—one internal output for the digital matrix (using an internal ADC)

●Digital matrix with:

—three input modes (Demodulator/SCART, SCART only and I²S)

—three stereo outputs (Loudspeakers, Headphone and SCART)

●High-end audio DAC

●S/PDIF output for connection with an external amplifier/decoder

●Internal multiplexer for the S/PDIF output (to share the internal S/PDIF output and the S/PDIF output generated by the external decoder of the digital broadcast)

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STV82x7

General Description

●Specific stand-by mode (Loop-through)

●Control by I²C bus (two I²C addresses)

●System PLL and Clock Generation using either a single quartz oscillator or a differential clock input

1.1.2Software Information

The different software combinations are listed in Table 2.

Table 2: Input/Output Software Configurations

			Output (Number of Channels)
	Input (Number of Channels)
		2 (+1)	4 (+1)	5 (+1)
	1	ST WideSurround or
		SRS→ WOW™
	2 (L and R)	ST WideSurround or
		SRS→ WOW™
		ST WideSurround or
		SRS→ TruSurround XT™ or
	2 (LT and RT)	ST OmniSurround or	Dolby→ Pro Logic→
		Dolby→ Pro Logic→ +SRS→
		TruSurround XT™ or
		Dolby→ Pro Logic→ +ST
		OmniSurround
		SRS→ TruSurround XT™ or
	4 (+1)	ST OmniSurround or	No processing
		Downmix
		SRS→ TruSurround XT™or
	5 (+1)	ST OmniSurround or	Downmix	No processing
		Downmix

Note: In addition to the above sound processing, it is always possible to add ST Voice and also ST Dynamic Bass algorithms.

Note: The SRS→ TruSurround→ and ST OmniSurround are approved by Dolby as Virtual Dolby Surround (VDS) and Virtual Dolby Digital (VDD).

The SRS→ TruSurround XT™ system is composed of:

●SRS→ TruSurround→

●SRS→ WOW™

The SRS→ WOW™ system also includes:

●SRS→ Dialog Clarity™

●SRS→ TruBass™

1.1.3Device Input Modes

●Demodulator and SCART Mode (with output fS = 32 kHz)

●SCART Only Mode (with output fS = 48 kHz)

●I²S Mode (with output fS = 32, 44.1 or 48 kHz)

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General Description

STV82x7

—External audio input interface using 3 x I²S (for decoded streams such as Dolby→ Digital and/or standard stereo streams)

1.1.4Electrical Features

Multi Power Supply: 1.8 V, 3.3 V and 8 V. Power Consumption:

●lower than 1 W in Functional mode (full features)

●200 mW in Loop-through mode corresponding to Switch-off of all digital blocks

1.2Typical Applications

The STV82x7 is specified to enable flexible, analog and digital TV chassis design (refer to Figure 2, Figure 3, Figure 4 and Figure 5).

The main considerations are:

●all necessary connections between devices can be provided through the TV set,

●pseudo stand-by mode used to copy to VCR or the DVD sources when the TV set is OFF,

●possible application compatibility with STV82x6 (TQFP80 package) TV design,

●pin-to-pin compatibility with STV82x8 (TQFP80 package) TV design.

The STV82x7 is used to process a single audio source (analog or digital). However, it is possible to process two audio sources simultaneously using an STV82x7 interconnection (two chips can be easily connected).

In the case of a single audio source, it is possible to hear and record in the same time: the same audio stream can be simultaneously output on headphone, loudspeakers, S/PDIF and the SCART connectors.

Note: Headphone and loudspeakers can be used simultaneously for dual-language purposes or for different sound settings (e.g. volume). In this case, certain restrictions occur (see Section 4.2: Audio Processing).

For more connections, the SCART-to-SCART path can be used. The use of these full analog paths implies that the sound is not digitally processed.

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STV82x7

General Description

Figure 2: STV8237 Typical Application (Enhanced Stereo)

Tuner		R
	STV8237	SubW
or	Multistandard Demodulation
	- FM 2-carrier and NICAM	L
	Sound Processing
	- Volume, Balance, 5-Band Equalizer
	- ST WideSurround
	- SRS→ WOW™
Left	Right

Figure 3: STV8247 Typical Application (Analog Virtual Sound)

Tuner		R
	STV8247
	Multistandard Demodulation	SubW
or	- FM 2-carrier and NICAM
	Sound Processing
	- Volume, Balance, 5-Band Equalizer	L
	- SRS→ TruSurround XT™
	- ST OmniSurround
	- Virtual Dolby→ Surround1
Left	Right
1. When using VDS with ST OmniSurround or SRS TruSurround XTTM, a Pro Logic→ decoder is mandatory.

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General Description

STV82x7

Figure 4: STV8257 Typical Application (Digital: Virtual Sound)

Multi-Channel Digital Decoder

(Dolby→ Digital)

R

I²S

S/PDIF Pass-thru

SubW

Tuner

STV8257

or

Multistandard Demodulation

- FM 2-carrier and NICAM

L

Audio Processing

- Volume, Balance, 5-Band Equalizer

- SRS→ TruSurround XT™

- ST OmniSurround

- Virtual Dolby→ Surround1

- Virtual Dolby→ Digital2

Left Right

1.When using VDS with ST OmniSurround or SRS TruSurround XTTM, a Pro Logic→ decoder is mandatory.

2.When using VDD with ST OmniSurround or SRS TruSurround XTTM, a Dolby→ Digital decoder is mandatory.

Figure 5: STV8277 Typical Application (Digital TV: Multi-Channel and Virtual Sound)

Multi-Channel Digital Decoder

(Dolby→ Digital)

R

I²S

S/PDIF Pass-thru

RS

SubW

STV8277

C

Tuner

or

Multistandard Demodulation

LS

- FM 2-carrier and NICAM

Audio Processing	L
- Volume, Balance, 5-Band Equalizer
- Dolby→ Pro Logic II→
- 5.1 Analog Outputs
- SRS→ TruSurround XT™
- Virtual Dolby→ Surround1
- Virtual Dolby→ Digital2

Left Right

1.When using VDS with ST OmniSurround or SRS TruSurround XTTM, a Pro Logic→ decoder is mandatory.

2.When using VDD with ST OmniSurround or SRS TruSurround XTTM, a Dolby→ Digital decoder is mandatory.

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STV82x7

General Description

Figure 6: STV8217 Typical Application (Digital Recorder)

	MPEG Codec
Tuner	I²S
or	STV8217
	Multistandard Demodulation
	- FM 2-carrier and NICAM
Left	Right

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General Description

STV82x7

1.3Pin Descriptions and Application Diagrams

●	AP	= Analog Power
●	DP	= Digital Power
●	I	= Input
●	O	= Output
●	OD	= Open-Drain

●B = Bi-Directional

●A = Analog

Table 3: TQFP80 Pin Description (Sheet 1 of 3)

	Pin	STV82x7	Type	Function for STV82x7	STV82x6
	No.	Pin Name	(STV82x7)	(Function for STV82x6 in italic characters)	Pin Name
	1	SC1_OUT_L	A	SCART1 Audio Output Left	AO1L
	2	SC1_OUT_R	A	SCART1 Audio Output Right	AO1R
	3	VCC_H	AP	8V Power for Audio I/O & ESD	Not connected
	4	GND_H	AP	High Current Ground for Audio Outputs	Connected to Ground
	5	SC3_OUT_L	A	SCART3 Audio Output Left	Not connected
	6	SC3_OUT_R	A	SCART3 Audio Output Right	Not connected
	7	VCC33_SC	AP	3.3V Power for Audio Buffers & DAC / ADC	VDDC
	8	GND33_SC	AP	Ground for Audio Buffers & DAC / ADC	GNDC
	9	SC1_IN_L	A	SCART1 Audio Input Left	AI1L
	10	SC1_IN_R	A	SCART1 Audio Input Right	AI1R
				Audio Bias Voltage Decoupling 1.55V
	11	VREFA	A	(Switched VREF decoupling pin for Audio Converters	VMC1
				(VMCP))
	12	GND_SA	AP	Ground for DACs	Connected to Ground
	13	VBG	A	Bandgap Voltage Reference Decoupling 1.2V	VMC2
				(VREF decoupling pin for Audio Converters (VMC))
	14	SC2_IN_L	A	SCART2 Audio Input Left	AI2L
	15	SC2_IN_R	A	SCART2 Audio Input Right	AI2R
	16	VCC33_LS	AP	3.3V Power for Audio DACs	VDDA
				(3.3V Power Supply for Audio Buffers and SCART)
	17	GND33_LS	AP	Ground for Audio DACs	GNDAH
				(Ground for Audio Buffers and SCART)
	18	SC2_OUT_L	A	SCART2 Audio Output Left	AO2L
	19	SC2_OUT_R	A	SCART2 Audio Output Right	AO2R
	20	VCC_NISO	AP	Polarization of the NISO (connected to 3.3V)	VDDH
				(8V / 5V Power supply for SCART & Audio buffers)
	21	VSS33_CONV	AP	Ground for DAC 1.8 to 3.3V Converters	Connected to Ground
	22	VDD33_CONV	AP	3.3V Power for DAC 1.8 to 3.3V Converters	VREFA
				(Voltage Reference for Audio buffers)

14/149

STV82x7							General Description
					Table 3: TQFP80 Pin Description (Sheet 2 of 3)
Pin			STV82x7		Type	Function for STV82x7				STV82x6
No.			Pin Name		(STV82x7)	(Function for STV82x6 in italic characters)				Pin Name
23		SC3_IN_L			A	SCART3 Audio Input Left			AI3L
24		SC3_IN_R			A	SCART3 Audio Input Right			AI3R
25		SCL_FLT			A	SCART Filtering Left			Not connected
26		SCR_FLT			A	SCART Filtering Right			BGAP
						(Bandgap Voltage Source Decoupling)
27		LS_C			A	Center Output			Not connected
28		LS_L			A	Left Loudspeaker Output			LSL
29		LS_R			A	Right Loudspeaker Output		LSR
30		LS_SUB			A	Subwoofer Output		SW
31		HP_LSS_L			A	Left Headphone Output or Left Surround Output			HPL
32		HP_LSS_R			A	Right Headphone Output or Right Surround Output			HPR
33		VSS18_CONV			DP	Ground for Digital part of the DAC/ADC			GNDSA
						(Substrate Analog/Digital Shield)
34		VDD18_CONV			DP	1.8V Power for Digital part of the DAC/ADC			Not connected
35					I	Headphone Detection
		HP_DET							HPD
36		ADR_SEL			I	Hardware Address selection for I²C Bus			ADR
37		VSS18			DP	Ground for Digital part			Connected to Ground
38		VDD18			DP	1.8V Power for Digital part			Not connected
39		SCL			OD	I²C Clock Input			SCL
40		SDA			OD	I²C Data I/O		SDA
41		VSS18			DP	Ground for Digital part			Connected to Ground
42		VDD18			DP	1.8V Power for Digital part			REG
						(5V Power Regulator Control)
43					I	Main Reset Input
		RST							RESET
44		S/PDIF_IN			I	Serial Audio Data Input			SYSCK
						(System Clock output)
45		S/PDIF_OUT			O	Serial Audio Data Output			MCK
						(I²S Master Clock output)
46		VDD33_IO1			DP	3.3V Power for Digital part			VDD1
47		VSS33_IO1			DP	Ground for Digital part			GND1
48		CK_TST_CTRL			D	To be Grounded			Not connected
49		VSS18			DP	Ground for Digital part			GNDSP
50		VDD18			DP	1.8V Power for Digital part			Not connected
51		CLK_SEL			I	Clock Input Format Selection			Not connected
52		XTALIN_CLKXTP			I	Crystal Oscillator Input or Differential Input Positive			XTI
						(Crystal Oscillator Input)
							15/149

	General Description				STV82x7
			Table 3: TQFP80 Pin Description (Sheet 3 of 3)
	Pin	STV82x7	Type	Function for STV82x7	STV82x6
	No.	Pin Name	(STV82x7)	(Function for STV82x6 in italic characters)	Pin Name
	53	XTALOUT_CLKXTM	O	Crystal Oscillator Output or Differential Input Negative	XTO
				(Crystal Oscillator Output)
	54	VCC18_CLK1	AP	1.8V Power for Clock PLL Analog & Crystal Oscillator 1/2	VDDP
				(3.3V Power supply for Analog PLL Clock)
	55	GND18_CLK1	AP	Ground for Clock PLL Analog & Crystal Oscillator 1/2	GNDP
	56	GND18_CLK2	AP	Ground for Clock PLL Digital 1/2	GND2
	57	VCC18_CLK2	DP	1.8V Power for Clock PLL Digital 1/2	VDD2
				(3.3V Power supply for Digital core, DSPs & IO Cells)
	58	VSS33_IO2	DP	Ground for Digital IO pins 60 to 69	Connected to Ground
	59	VDD33_IO2	DP	3.3V power for Digital IO pins 60 to 69	Not connected
	60	I2S_PCM_CLK	I/O	I²S Slave Clock Input/Output Channel 1, 2 & 3	Not connected
	61	I2S_SCLK	I/O	I²S Clock Input/Output Channel 1, 2 & 3 (I²S bus data	SDO
				output)
	62	I2S_LR_CLK	I/O	I²S Word Select Input/Output Channel 1,2 & 3	ST/SDI
				(Stereo Detection output / I²S Bus Data input)
	63	I2S_DATA0	I/O	I²S Data Input/Output Stereo Channel 1	WS
				(I²S Bus Word Select output)
	64	I2S_DATA1	I	I²S Data Input Stereo Channel 2	SCK
				(I²S Bus Clock output)
	65	I2S_DATA2	I	I²S Data Input Stereo Channel 3	BUS1
				(Bus Expander Output 1)
	66	VDD18	DP	1.8V Power for Digital Core & I/O Cells Pin	Not connected
	67	VSS18	DP	Ground for Digital Core & I/O Cells Pin	Connected to Ground
	68	BUS_EXP	O	Bus Expander Function	BUS0
				(Bus Expander Output 2)
	69	IRQ	O	Interrupt Request to Microprocessor	IRQ
	70	GND_PSUB	AP	Ground Substrate Connection	Connected to Ground
	71	VDD18_ADC	DP	VDD 1.8V for ADC (Digital Part)	Not connected
	72	VSS18_ADC	DP	Ground to Complement 1.8V VDD for ADC	Connected to Ground
	73	SIF_P	A	Sound IF input (positive)	SIF
	74	SIF_N	A	Sound IF input (negative) (ADC VTOP Decoupling pin)	VTOP
	75	GNDPW_IF	AP	Polarization for the IF block	VREFIF
				(Voltage Reference for AGC Decoupling pin)
	76	VCC18_IF	AP	1.8V Power for IF AGC & ADC	VDDIF
	77	GND18_IF	AP	Ground for IF AGC & ADC	GNDIF
	78	MONO_IN	A	Mono Input (for AM Mono)	MONOIN
	79	SC4_IN_L	A	SCART4 Audio Input Left	Not connected
	80	SC4_IN_R	A	SCART4 Audio Input Right	Not connected

16/149

STV82x7

General Description

Figure 7: STV82x7 Application Diagram

SC3 IN Right

SC3 IN Left

SC2 OUT Right

SC2 OUT Left

SC2 IN Right

SC2 IN Left

SC1 IN Right

SC1 IN Left

SC3 OUT Right

SC3 OUT Left

SC1 OUT Right

SC1 OUT Left

SC4 IN Right

SC4 IN Left

Mono IN

SIF

IRQ

BUS EXPANDER

I2S DATA 2

I2S DATA 1

I2S DATA 0

I2S LR CLK

I2S SCLK

I2S PCM CLK

C50

100nF

C49

+

10µF

C52 100nF

C51

10µF

C48

C38

+

10µF

+

1µF

+

+

10µF

+

1µF

C61

1µF

C60

1µF

10µF

+

1µF

+

1µF

C47

C37

+

+

C53

C54

+

1µF

C56

10µF

C46

+

+

C55

+

1µF

C45

330pF

+

+

+3.3V

C75

330pF

100nF

+

10µF

C39

10µF

C361µF

C44

C40

C59

47µFL1+

10µH

R9

220

R8

C74

220

220 C73

C72 330pF

10µH

L12 +8V

330pF C71

C70

330pF

C35

100pF

R7 220

330pF

10µH

L11

C57

100nF

C41

10µF

560

+

R5 220

R3

33nF 33nF

5 R6

R4

220

+1.8V

22nF

1µF

C65 C64

2 C42

100nF

L10

10µH

C34

C3

+

C63

33nF

C58

100nF

20

19

18

17

16

15

14

13

12 11 10

9

8

7 6

4

3

1

C43

47µF

C4

1µF

L13

100nF

VCC NISO

GND H

VCC H

SC4_IN_R

C33

+100nF

21

VSS33_CONV

80

VDD33_CONV

SC4_IN_L

C6 C5

1µF 1µF

+ +

C67 C66

33nF33nF

L14

100µH

100µH

C62

33nF

C14

22

SC3_IN_L

OUTSC2R OUTSC2L

GND33LS

VCC33LS

SC2INR

SC2INL VBG

GNDSA

VREFA

SC1INR

SC1INL

GND33SC

VCC33SC

OUTSC3R

OUTSC3L

OUTSC1R

OUTSC1L

MONO_IN

79

23

78

220nF

SC3_IN_R

GND18_IF

24

77

C32

100µH

SCL_FLT

VCC18_IF

100µH

L15

25

SCR_FLT

GND_PWIF

76

C30

100nF

L16

26

75

LS_C

SIF_N

27

74

LS_L

SIF_P

28

73

+

29

LS_R

IC1

STV82x7

TQFP80

VSS18_ADC

72

LS_SUB

VDD18_ADC

30

71

HP_LSS_L

GND_PSUB

31

70

HL_LSS_R

IRQ

32

69

100µH

33

VSS18_CONV

BUS_EXP

68

L17

34

VDD18_CONV

VSS18

67

HP_DET

VDD18

35

66

100µH

ADR_SEL

I2S_DATA2

L18

36

65

33nF 33nF

VSS18

I2S_DATA1

1µF 1µF

37

XTALOUT/CLKXTM

64

VDD18

I2S_DATA0

C8 C7

100nF

100nF

38

XTALIN/CLKXTP

63

SCL

IOVSS33 TSTCKCTRL

I2S_LR_CLK

3 Address select

C13

39

SDA

CLK1VCC18

CLK1GND18

CLK2GND18

CLK2VCC18

PCMI2SCLK

I2S_SCLK

62

40

OUTSPDIF

61

IOVDD33

IOVSS33

IOVDD33

SL1

VSS18 VDD18 NRST

INSPDIF

VSS18

VDD18

SELCLK

+ +

C69 C68

C10

1

1

2

3

41

42

43

44

45

46

47

48 49 50 51 52 53 54 55 56 57 58 59 60

C29

100nF

C9

330µF

100nF

C12

C19

100nF

+

+3.3V

C15

100nF

C25

100nF

C26

100nF

C27

100nF

C18

100nF

L2

10µH

C16

470nF Reset

10µF

+ C23

47µF

C17

27MHz

C22 CRYSTAL

+

XT1

HP Left/LS surround Left

HP Right/LS surround Right

R1

470K

Headphone detection

L4

10µH

C21

27pF

27pF

L6

10µH

LS Center

LS Left

LS Right

Subwoofer

+1.8V

SCL

SDA

+3.3V

SPDIF IN

SPDIF OUT

+3.3V

+1.8V

1.8V

1.8V

1.8V

17/149

18/149

L15,L16

strap

with

100µH *

General

Part

with

STV82x6

STV82x7

L1

Not Connected

10µH

L2

10µH

Not Connected

L3

Not Connected

10µH

L4

10µH

Not Connected

L5,L6

Not Connected

10µH

L8

Not Connected

10µH

L13,L14

strap

100µH *

LS Center

L17,L18

strap

100µH *

Description

C8

C7

C6

C5

C4

C3

C41

10 µF

Not Connected

Figure

R2

270K

Not Connected

LS Left

R10

330

Not Connected

R11

Not Connected

0 ohm

R12

82

Not Connected

LS Right

R13

Not Connected

0 ohm

R14

0 ohm

Not Connected

R15

0 ohm

Not Connected

Subwoofer

R16

Not Connected

0 ohm

R17

Not Connected

0 ohm

R18

0 ohm

Not Connected

HP Left/LS surround Left

R19

Not Connected

0 ohm

C3

Not Connected

1 µF

C9

Not Connected

330 µF

HP Right/LS surround Right

C10,C13

Not Connected

100 nF

C15,C18

Not Connected

100 nF

C21,C22

22 pF

27 pF

C23

Not Connected

47 µF

C27,C29

Not Connected

100 nF

C30

Not Connected

100 nF

C31

100 nF

Not Connected

1µF

1µF

1µF

1µF

1µF

1µF

C42

Not Connected

100 nF

8:

+

+

+

+

+

+

C43

Not Connected

10 µF

L17 *

C59

10 µF

47 µF

3

C63

100 nF

C60

33 nF

SC3 IN Left

STV82x6/STV82x7

L8

C64,C65

++

33 nF

+1.8V

C69

C68

100µH

C67

C66

C65

C64

C66,C67

Not Connected

33 nF

10µH

+

C9

33nF

33nF

33nF

33nF

33nF

33nF

C68,C69

Not Connected

33 nF

330µF

*

C70,C71

Not Connected

330 pF

L18

*

C72,C73

Not Connected

330 pF

C10

100µH

L16

C74,C75

Not Connected

330 pF

100µH

C76,C77

10 µF

Not Connected

*

C78

10 µF

Not Connected

Headphone detection

100nF

L15

C79

10 µF

47 µF

100µH

SL2

between 2-3

between 1-2

1

L14

*

SL3

between 2-3

between 1-2

+3.3V

1

SL1

100µH

L13 *

100nF

100µH

C12

2

C63

C78

+

3

Address select

10µF

C62

C13

33nF

C61

SC3 IN Right

SCL

100nF

1µF

SDA

SCL VDD18

VSS18

SELADR DETHP CONVVDD18 CONVVSS18

LSSHLR LSSHPL SUBLS

LSR

LSL LSC

FLTSCR

FLTSCL INSC3R INSC3L

CONVVDD33 CONVVSS33

1µF

Compatible

SPDIF OUT

43

RST_N

SC2_OUT_L

18

+

10µF

R10

+8V

C54

+

SC2 IN Left

+

C59

C14

L2

+8V

47µF

L1

SDA

100nF

10µH

10µH

+3.3V

R1

40

39 38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22 21

0

+

+3.3V

470K

R13

R9

C56

SC2 OUT Right

C16

Reset

220

C75

10µF

470nF

330pF

C55

+

SC2 OUT Left

C58

R8

10µF

SPDIF IN

C15

100nF

C77

+

10µF

220

C74

+

R14

100nF

41

VSS18

VCC_NISO

20

330pF

C53

SC2 IN Right

0

42

19

C57

R19

C76

1µF

VDD18

SC2_OUT_R

44

SPDIF_IN

GND33_LS

17

100nF

0

1µF

Application

L7

45

16

0

C52

100nF

C26

VDD33_IO

SC1_OUT_R

100nF

+

10µF

SC3 OUT Left

1

60

1

10µF+

+

+3.3V

46

SPDIF_OUT

VCC33_LS

15

R11

330

C50

10µH

+

C17

R18

47

VDD33_IO

SC2_IN_R

14

+

C51

100nF

10µF

C18

C19

48

VSS33_IO

IC1

SC2_IN_L

13

10µF

0

100nF

100nF

49

CK_TST_CTRL

STV82x6 / STV82x7

VBG

12

50

VSS18

GND_SA

11

C49

51

VDD18

TQFP80

VREFA

10

C46

+

52

CLK_SEL

SC1_IN_R

9

1µF

10µF

53

XTALIN/CLKXTP

SC1_IN_L

8

C45

+

SC1 IN Right

XTALOUT/CLKXTM

GND33_SC

+1.8V

54

7

1µF

C25

VCC18_CLK1

VCC33_SC

R7

220

C41

R12

55

6

SC1 IN Left

GND18_CLK1

SC3_OUT_R

220

+

+1.8V

100nF

56

5

R6

C73

C44

10µF

82

+8V

C47

SL2

57

GND18_CLK2

SC3_OUT_L

4

C72

330pF

100nF

+

SC3 OUT Right

C21

58

VCC18_CLK2

GND_H

3

330pF

10µF

VSS33_IO

VCC_H

C42

C43

C48

2

59

2

+1.8V

270k

0

100nF

I2S_PCM_CLK

I2S LR CLK I2S DATA0

I2S DATA1

I2S DATA2 VDD18 VSS18 BUS EXP

IRQ GND PSUB VDD18 ADC

VSS18 ADC

SIF P SIF N

GND PWIF

VCC18 IF GND18 IF MONO IN

SC4 IN L SC4 IN R

SC1_OUT_L

R4

220

10µH

C70

+

C38

Electrical

313

I2S SCLK

61

62 63

64

65

66 67

68

69 70

71

72 73

74

75

76 77

78

79 80

+

L3

+8V

C40

+

SC1 OUT Right

XT1

C27

R5

220

10µF

27MHz

R2

R15

C39

+

SC1 OUT Left

CRYSTAL

100nF

330pF

C71

10µF

SL3

330pF

1µF

SC4 IN Right

C37

+

SC4 IN Left

2

1µF

C22

R16

Mono IN

C36

1µF

L6

0

C33

0

L4

L11

10µH

I2S DATA 2 / BUS1

Diagram

R3

560

C79

+3.3V

1.8V

10µH

100nF +

47µF

10µH

+

C23

L5

+1.8V

47µF

C32

10µH

SIF

220nF

C34

C35

IRQ

22nF

100pF

BUS EXPANDER / BUS0

C29

R17

C30

100nF

C31

100nF

100nF

I2S DATA 1 / SCK

I2S DATA 0 / WS

I2S LR CLK / SDI

I2S SCLK / SDO

I2S PCM CLK

STV82x7

Note :

components with * are only mandatory

in case of DOLBY certification

STV82x7

General Description

Figure 9: STV82x7/STV82x8 Compatible Application Electrical Diagram (TQFP80)

LS Center		LS Left		LS Right		Subwoofer		HP Left/LS surround Left		HP Right/LS surround Right

	3.3V)	ground)
	to	to
	connected	connected
	20	20
SL1 configuration	between 2 and 3 (pin	between 1 and 2 (pin
:	: :
Table 1	STV82x7	STV82x8

				C64	33nF
C3	1µF
		+		C65	33nF
C4	1µF
	1µF	+		C66	33nF
C5		+			33nF				L14 *
C6	1µF			C67			L16 * 100µH	L15 *	100µH
		+
C7	1µF	+	L17 *	C68 100µH	33nF	L18 *	100µH	100nF
							C10
C8	1µF			C69	33nF
		+
					C9	330µF
					+
				L2	10µH

+1.8V

Headphone detection

1

C63

33nF

L13 *	100µH
100µH

		select
SL1	2	Address
1		3
100nF	C12

+3.3V

SC3 IN Right

SC3 IN Left

SC2 OUT Right

SC2 OUT Left

SC2 IN Right

SC2 IN Left

SC1 IN Right

SC1 IN Left

SC3 OUT Right

SC3 OUT Left

SC1 OUT Right

SC1 OUT Left

SC4 IN Right

SC4 IN Left

Mono IN

SIF

IRQ

BUS EXPANDER

I2S DATA 2

I2S DATA 1

I2S DATA 0

I2S LR CLK

I2S SCLK

I2S PCM CLK

C50

100nF

C49

+

10µF

1µF

1µF

C56

10µF

C55

10µF

C53

1µF

C54

1µF

100nFC52

C51

10µF

C46

1µF

C45

1µF

C47

10µF

C48

10µF

C38

1µF

C37

1µF

R12

10K

+

+

+

+

+

C61

C60

+

+

+

+

+

+

+

+

10K

R11

+3.3V

C75

330pF

330pF

C44

100nF

C40

10µF

C39

10µF

C36 1µF

+

+

+

C59

+47µFL1

10µH

R9

220

1)Table R8

C74

220

C57

100nF

R7220

220 C73

C72 330pF

330pF

C41

10µF

10µH

L12 +8V

C71330pF

C70

330pF

C35

100pF

10µH

L11

560

2 SL1 ( see

C42

+100nF

R5 220

220

L10

10µH

C34

R3

R6

R4

22nF

+1.8V

3

1

C58

100nF

20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

C43

47µF

C62

33nF

C14

100nF

VCCNISO

SC2 OUT L

GND33 LS

VCC33 LS

SC2 IN R

SC2 IN L VBG

GND SA

VREFA

SC1 IN R

SC1 IN L

GND33 SC

VCC33 SC

SC3 OUT R

SC3 OUT L

GND H

VCC H

SC1 OUT R

SC1 OUT L

SC4_IN_L

C33

+100nF

CONV_VDD33SC2OUTR

21

VSS33_CONV

SC4_IN_R

80

22

SC3_IN_L

MONO_IN

79

23

78

220nF

HP_DET

IC1

STV82x8orSTV82x7

TQFP80

VDD18

C32

C30

100nF

24

SC3_IN_R

GND18_IF

77

25

SCL_FLT

VCC18_IF

76

SCR_FLT

GND_PWIF

26

75

LS_C

SIF_N

27

74

LS_L

SIF_P

28

73

LS_R

VSS18_ADC

29

72

LS_SUB

VDD18_ADC

30

71

HP_LSS_L

GND_PSUB

31

70

HL_LSS_R

IRQ

32

69

VSS18_CONV

BUS_EXP

33

68

VDD18_CONV

VSS18

34

67

35

ADR_SEL

I2S_DATA2

66

36

65

VSS18

I2S_DATA1

37

XTALOUT/CLKXTM

64

C13

100nF

VDD18

VSS18 VDD18

NRST

INSPDIF

OUTSPDIF

IOVDD33

IOVSS33 CTRLTSTCK

VSS18

VDD18

SELCLK

XTALIN/CLKXTP

CLK1VCC18

CLK1GND18

CLK2GND18

CLK2VCC18

IOVSS33

IOVDD33

CLKPCMI2S

38

I2S_DATA0

63

SCL

I2S_LR_CLK

39

62

SDA

I2S_SCLK

40

61

3

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56 57

58

59

60

C29

100nF

C19

100nF

C15

100nF

C18

100nF

C25

100nF

C26

100nF

C27

100nF

Dolby certification

of

case

470nF Reset

mandatory in

C16

10µF

+ C23

47µF

with * are only

R1

470K

+ C17

XT1

27MHz

CRYSTAL

: components

L4

10µH

C21

27pF

C22

27pF

L6

10µH

Note

SCL

SDA

+3.3V

SPDIF IN

SPDIF OUT

+3.3V

+1.8V

1.8V

1.8V

1.8V

19/149

System Clock

STV82x7

2 System Clock

The System Clock integrates 2 independent frequency synthesizers.

The first frequency synthesizer can be used in one of two modes:

●In Mode 1, it is used by the demodulator, and the frequecy is 49.152 MHz.

●In Mode 2, it is used by the I²S input and is synchronous with the input frequency (fS = 32, 44.1 or 48 kHz) and the frequency is 49.152 MHz (for fS = 32 or 48 KHz) or 45.1584 MHz (for fS = 44.1 KHz).

The second frequency synthesizer is used by the DSP core and can be adjusted between 100 and 150 MHz depending on the application (around 106 MHz at reset value).

The default values are designed for a standard 27-MHz reference frequency provided by a stable single crystal or an external differential clock signal (for example, from the STV35x0) depending on the CLK_SEL pin configuration (CLK_SEL = 1 means a single crystal, 0 means an external differential clock). The 27-MHz value is the recommended frequency for minimizing potential RF interference in the application. The sinusoidal clock frequency, and any harmonic products, remain outside the TV picture and sound IFs (PIF/SIF) and Band-I RF.

Note: A change in the reference frequency is compatible with other default I²C programming values, including those of the built-in Automatic Standard Recognition System.

20/149

STV82x7

Digital Demodulator

3 Digital Demodulator

The Digital Demodulator (see Figure 10) is composed of two channels. The first channel demodulates an FM or an AM signal. The second channel demodulates FM 2-carrier or NICAM signals (stereo demodulation).

All channel parameters are programmed automatically by the built-in Automatic Standard Recognition System (Autostandard) in order to find the correct sound standard. Channels can also be programmed manually via the I²C interface for very specific standards not included among the known standards.

Figure 10: Demodulator Block Diagram

				Channel 1 = Mono Left
					AM	AM
				Channel	Demodulator
			DCO1+
				Filter			AM/FM Mono
			Mixer
							(To Sound Preprocessing)
				FIR1	FM
			CAROFFSET1 (22h)		Demodulator	FML
			AUTOSTD_STATUS (8Eh)
SIF	AGC	A/D
	Amp
					DEMOD_STAT(0Dh)
				AUTOSTD	ZWT_STAT (42h)
					NICAM_STAT(3Fh)
		AGC
		Control
		AGC_CTRL (0Eh)	AUTOSTD_TIMERS (8Dh)
			AUTOSTD_CTRL (8Ah)			Zweiton
		AGC_GAIN (0Fh)
			AUTOSTD_STANDARD_DETECT (8Bh)			Decoder
			AUTOSTD_STEREO_DETECT (8Ch)
					FM		FM Stereo
					Demodulator
				Channel			(To Sound Preprocessing)
			DCO2 +
				Filter
			Mixer
				FIR2
					DQPSK	NICAM	NICAM L
			CAROFFSET2 (3Ah)		Demodulator	Decoder	NICAM R
							(To Sound Preprocessing)
				Channel 2 = Stereo/Mono Right

3.1Sound IF Signal

The Analog Sound Carrier IF is connected to the STV82x7 via the SIF pin. Before Analog-to-Digital Conversion (ADC), an Automatic Gain Control (AGC) is performed to adjust the incoming IF signal to the full scale of the ADC. A preliminary video rejection is recommended to optimize conversion and demodulation performances. The AGC system provides a gain value allowing for a wide range of SIF input levels and is activated for all standards, except L/L’. In this particular case, the sound carrier is AM-modulated and an automatic level adjustment would only damage the transmitted audio signal. A preset I²C parameter is provided to define the gain of the AGC used in Manual mode (Registers AGC_CTRL and AGC_GAIN).

Note: For optimum AM demodulation performance, it is recommended to use the MONO Input.

21/149

Digital Demodulator

STV82x7

3.2Demodulation

The demodulation system operates by default in Automatic mode. In this mode, the STV82x7 is able to identify and demodulate any TV sound standard including NICAM and A2 systems (see Table 4) without any external control via the I²C interface. It consists of the two demodulation channels (Channel 1 = Mono Left and Channel 2 = Mono Right/Stereo) to simultaneously process two sound carriers in order to handle all transmission modes (stereo and up to three mono languages). The built-in Automatic Standard Recognition System (Autostandard) automatically programs the appropriate bits in the I²C registers which are forced to Read-only mode for users (see Section 12.1). The programming is optimized for each standard to be identified and demodulated.

Each mono and stereo standard can be removed (or added) from the List of Standards to be recognized by programming registers AUTOSTD_STANDARD_DETECT and AUTOSTD_STEREO_DETECT, respectively. The identified standard is displayed in register AUTOSTD_STATUS and any change to standard is flagged to the host system via pin IRQ. This flag must be reset by re-programming the MSBs of register AUTOSTD_CTRL while checking the detected standard status by reading registers AUTOSTD_STATUS, NICAM_STAT and ZWT_STAT. Moreover, the detection of Stereo mode during demodulation is also flagged in register AUTOSTD_STATUS.

Important: L/L’ and D/K standards cannot be automatically processed because the same frequency is used for the MONO carrier. An exclusive L/DK selection must programmed in register AUTOSTD_CTRL. This may be externally controlled by detecting the RF modulation sign, which is negative for all TV standards except L/L’.

To recover out-of standard FM deviations or the Sound Carrier Frequency Offset, additional I²C controls are provided without interfering with the Automatic Standard Recognition System (Autostandard).

DK-NICAM Overmodulation Recovery: Four different FM deviation ranges can be selected (via register AUTOSTD_CTRL) for the DK standard while the Autostandard system remains active. The maximum FM deviation is 500 kHz in DK Mono mode and 350 kHz in DK NICAM mode (limited by overlapping FM and NICAM spectrum values). The demodulated signal peak level (proportional to the FM deviation) is detected by the Peak Detector and written to registers PEAK_DET_L and PEAK_DET_R. This value is used to implement Automatic Overmodulation Detection via an external I²C control.

Important: Only the selection of the 50 kHz FM deviation standard is compatible with the other DKA2* standards (DK1, DK2 or DK3). These standards must be removed from the list of standards (registers AUTOSTD_STANDARD_DETECT and AUTOSTD_STEREO_DETECT) when programming larger FM deviations reserved only for DK-NICAM standards.

Table 4: Recognized Standards

		Type	Carrier 1	Carrier 2	FM Deviation			De-	Roll	Pilot
System	Sound Type								-off	Frequency
		Name	(MHz)	(MHz)	Nom.	Max.	Over	emphasis	(%)	(kHz)
	FM Mono		5.5
B/G	FM/NICAM		5.5	5.850	27	50	80	J17	40
	FM 2-Carrier	A2	5.5	5.742	27	50	80	50 µs		54.6875
D/K	FM Mono		6.5
	FM/NICAM		6.5	5.850	27	50	80	J17	40
D/K1	FM 2-Carrier	A2*	6.5	6.258				50 µs		54.6875
22/149

STV82x7								Digital Demodulator
		Table 4: Recognized Standards (Continued)
		Type	Carrier 1	Carrier 2	FM Deviation			De-	Roll	Pilot
System	Sound Type								-off	Frequency
		Name	(MHz)	(MHz)	Nom.	Max.	Over	emphasis	(%)	(kHz)
D/K2	FM 2-Carrier	A2*	6.5	6.742				50 µs		54.6875
D/K3	FM 2-Carrier	A2*	6.5	5.742				50 µs		54.6875
I	FM Mono		6.0
	FM/NICAM		6.0	6.552	27	50	80	J17	100
L	AM/NICAM		6.5	5.850				J17	40
M/N	FM Mono		4.5		15	27	50	75 µs
	FM 2-Carrier	A2+	4.5	4.724	15	27	50	75 µs		55.069

For Chinese TV transmissions (DK-NICAM) which are subject to overmodulation, different FM deviations are proposed for sound demodulation.

Sound Carrier Frequency Offset Recovery: Both Mono and Stereo IF Carrier frequencies can be adjusted independently (registers CAROFFSET1 and CAROFFSET2) within a large range (up to 120 kHz for standard mono FM deviations) while the Automatic Standard Recognition System remains active. The frequency offset estimation is written in registers DC_REMOVAL_L and DC_REMOVAL_R (Mono Left / Channel 1 and Mono Right / Channel 2, respectively) and can be used to implement the Automatic Frequency Control (AFC) via an external I²C control.

Manual Mode: If required, the Automatic Standard Recognition System system can be disabled (Manual mode) and the user can control all registers including those only controlled by the Automatic Standard Recognition System function when active. Manual mode is selected in register AUTOSTD_STANDARD_DETECT (bit LDK_SCK, I_SCK, BG_SCK and MN_SCK set to 0).

23/149

Dedicated Digital Signal Processor (DSP)

STV82x7

4 Dedicated Digital Signal Processor (DSP)

A dedicated Digital Signal Processor (DSP) takes charge of all audio processing features and the low frequency signal processing features of the demodulator. The internal 24-bit architecture will ensure a high quality signal treatment and an excellent dynamic.

4.1Back-end Processing

The “back-end” processing corresponds to the low frequency signal processing (32 kHz or higher frequencies) of the demodulator and other inputs (I²S, ADC).

Figure 11 shows a flowchart of the back-end processing tasks. However, the figure shows that the processing is only a SINGLE SOURCE PROCESSING flow (no processing is possible with “Demod + SCART” and I²S inputs simultaneously) and that the selection of a headphone output restricts the loudspeakers configuration to 2+1 instead of 5+1.

Figure 11: Back-end Audio Processing

“Demod + SCART” or “SCART only” Input Modes

Autostandard

FM Channel1

DC

FM

FM

FM

Removal

De-emphasis

Prescale

Dematrix

FM Channel2

9D, bit 7 = 1

9D, bit 7 = 0

NICAM L

Detector:

DC

NICAM

NICAM

NICAM

Detector:

NICAM R

Removal

De-emphasis

Prescale

Dematrix

Stereo Peak

Stereo Peak

SCART L

DC

SCART

Removal

Prescale

SCART R

“I2S” Input Mode

1

0

I2S in 1

9D, bit 7 =

9D, bit 7 =

SRC X2/X4

I2S in 3

Detector:

I²S

Detector:

I2S in 2

Stereo Peak

Prescale

Stereo Peak

Digital Audio Matrix

DownMix

2 LS

(L and R)

2 HP

(L and R)

2 SCART

(L and R)

2 to 6 LS

(L,R,C,LFE,Ls,Rs)

2 HP

(L and R)

2 SCART

(L and R)

24/149

STV82x7

Dedicated Digital Signal Processor (DSP)

The main features depend on the path:

●FM Channel

—DC Removal

—Prescaling

—De-emphasis (50 or 75 us)

—Stereo Dematrix

●NICAM Channel

—DC Removal

—Prescaling

—De-emphasis (J17)

—Dematrix

●Input SCART Channel

—DC Removal

—Prescaling

●Input I²S Channel

—I²S Prescaling

●Digital Audio Matrix

—Audio Channel Multiplexer between the different sources (IF, I²S, SCART) towards all outputs (S/PDIF, LS, HP or SCART).

●Autostandard management

—device configuration depending on the standard to be detected

—freeze the device when a standard is detected

—once a standard detected, check that there is no change in the detection status

—set the correct action depending on any change in the detection status (mono backup or mute setup and new standard detection)

●SCART

—Downmixing: LT / RT or L0 / R0 (see AC-3 specification)

—Soft Mute

4.2Audio Processing

The following software is provided for main loudspeakers (L, R, C, LS, RS, SubW):

●Downmix

●Dolby® Pro Logic II® Decoder (LT, RT →L, R, C, Ls, Rs, SubW) with Bass Management

●ST WideSurround, ST OmniSurround, SRS® WOW™ or SRS® TruSurround XT® (certified Virtual Dolby® Surround and Virtual Dolby® Digital)

●ST Dynamic Bass

●Smart Volume Control (SVC)

●5-band Equalizer or Bass-Treble

●Loudness

●Volume with independent channels (Smooth Volume Control)

●Master Volume Control

●Mute/soft-mute

25/149

Dedicated Digital Signal Processor (DSP)

STV82x7

●Balance

●Beeper

●Pink Noise Generator (used to position the loudspeakers)

●Programmable Delay for each loudspeaker

●Adjustable Delay for “lip sync” up to 120 ms (to compensate audio/video latency) in SCART Only Mode and up to 180 ms in Demodulator and SCART Mode

The following software is provided for the headphone or auxiliary output:

●Downmix

●SRS→ TruBass™

●Smart Volume Control (SVC)

●Bass/Treble

●Loudness

●Independent Volume for each channel (Smooth Volume Control)

●Soft Mute

●Balance

●Beeper

●Adjustable Delay for “lip sync” up to 120 ms (to compensate audio/video latency) in SCART Only Mode and up to 180 ms in Demodulator and SCART Mode

The following software is provided for SCART or S/PDIF outputs:

●Downmix

●Soft Mute

26/149

S/PDIF

STV82x7

Input

Figure

Digital

S/PDIF

S/PDIF

12:

Soft

Output

Select

Mute

Audio

L SCART

Volume

Digital

SCART

Processing

R SCART

Soft

Balance

Output

Mute

L

Adjustable

SRS

ST

Bass /

Digital

ST Wide

Dynamic

Treble or

Volume

S

LS

for

R

Delay

TruBass

Bass

5 bands

Balance

Soft

Surround

Mute

Output

SRS

Equalizer

Loudspeakers,

Decoder

1to2/2to2

3/2

ness

Mgmt.

ST

TruSurround

Dolby

XT

Digital

C

Pro Logic

Volume

Center

or

or

2/0

Soft

Output

Pro Logic II

Mute

and

Loud-

Bass

LFE

OmniSurnd

SVC

Volume

Digital

Subwoofer

Selectoutput

outputsS/PDIFandSCARTHeadphone,

ProcessorSignalDigitalDedicated

Soft

Output

Mute

Ls

Volume

Digital

Surround

Soft

Rs

Balance

Output

Mute

L HP

Adjustable

SRS

SVC

Bass/

Volume

Digital

Headphone

Loud-

Soft

S

R HP

Delay

TruBass

Treble

Balance

Output

ness

Mute

Beeper

27/149

(DSP)

Dedicated Digital Signal Processor (DSP)

STV82x7

4.3ST WideSurround

STV82x7 offers three preset ST WideSurround Sound effects on the Loudspeakers path:

●Music, a concert hall effect

●Movie, for films on TV

●Simulated Stereo, which generates a pseudo-stereo effect from mono source

“ST WideSurround Sound” is an extension of the conventional stereo concept which improves the spatial characteristics of the sound. This could be done simply by adding more speakers and coding more channels into the source signal as is done in the cinema, but this approach is too costly for normal home use. The ST WideSurround system exploits a method of phase shifting to achieve a similar result using only two speakers. It restores spatiality by adding artificial phase differences.

The Surround/Pseudo-stereo mode is automatically selected by the Automatic Standard Recognition System (Autostandard) depending on the detected stereo or mono source. By default, “Movie” is selected for Surround mode. This value may be changed to “Music” by the STSRND_MODE bit in the STSRND_CONTROL register.

Additional user controls are provided to better adapt the spatial effect to the source. The ST WideSurround Gain (STSRND_LEVEL) and ST WideSurround Frequency (STSRND_FREQ) registers can be used to enhance Music Predominancy in Music mode and Theater effect and Voice Predominancy in Movie mode.

4.4ST OmniSurround

STV82x7 offers a spatial virtualizer to output any multi-channel input in stereo on the Loudspeakers path:

“ST OmniSurround” will recreate a multi-channel spatial sound environment using only the Left and Right front speakers. It can be adapted to any input configuration (OMNISRND_INPUT_MODE).

ST Voice will allow you to enhance the voice content of your program to increase the intellegibility and the presence of the sound.

4.5Dolby Pro Logic II Decoder

Dolby→ Pro Logic II→ is a matrix decoder that decodes the five channels of surround sound that have been encoded onto the stereo sound tracks of Dolby→ Surround program material such as DVD movies and TV shows.

It is even possible to decode standard stereo signals like music or non encoded movies. Furthermore, it is an active process designed to enhance sound localization through the use of very high-separation decoding techniques.

The Dolby→ Pro Logic II→ decoder is also able to emulate the former Dolby→ Pro Logic→ decoder in a specific mode.

4.6Bass Management

This processing will generate the subwoofer signal and adjust all loudspeakers channels gain and bandwidth.

Speakers capable of reproducing the entire frequency range will be referred to as “full range speakers”, then signals sent to full range speaker will be full bandwidth (no filtering).

28/149

STV82x7

Dedicated Digital Signal Processor (DSP)

Speakers that have limited bass handling capabilities will be referred to as “satellite speakers”, then signals sent to satellite speaker will be high-pass filtered to remove bass information below 100 Hz.

In the STV82x7, five output configuration modes have been implemented according to “Dolby Digital Consumer Decoder” specifications. They are described below.

4.6.1Bass Management Configuration 0

In some cases, the bass management filters are available in the decoder itself, so there is no need to reproduce these filters. The output configuration shown in Figure 13 offers this possibility.

Figure 13: Bass Management Configuration 0 (with Pro Logic switch indicating its reset state)

L

L

R

R

C

C

Ls

Ls

Rs

Rs

-15 dB

LFE

SubW

-5 dB

+

29/149

Dedicated Digital Signal Processor (DSP)

STV82x7

4.6.2Bass Management Configuration 1

Configuration 1, shown in Figure 14, assumes that all five speakers are not full range and that all of the bass information will be redirected to and reproduced by a single subwoofer. This configuration is intended for use with 5 satellite speakers.

To prevent signal overload, the five main channels are attenuated by 15 dB, while the LFE channel is attenuated by 5dB to maintain the proper mixing ratio.

Figure 14: Bass Management Configuration 1 (with Pro Logic switch indicating its reset state)

L

L

R

R

C

C

Ls

Ls

Rs

Rs

LFE

-

15 dB

SubW

-5 dB

+

30/149