SGS Thomson Microelectronics STV8203 Datasheet

MULTISTANDARDTV SOUNDDEMODULATOR

.

PERFORMS FM MONO, FM 2 CARRIERS
ANDNICAMRECEPTION

.

B/D/G/H/I/K/K1/K2/L/L’

.

UPTO 500kHzDEVIATIONFM DEMODULA TOR

.

ALL PRE AND POST-PROCESSING INTE­GRATEDFILTERS,ALIGNMENTFREE

.

STANDARDRECOGNITIONFLAG

.

SINGLEQUARTZ CRYSTAL

.

I2C BUSCONTROLLED

.

AMAND DOUBLESCARTAUDIO MATRIX

.

STAND-BYWITH THRU MODE

.

SINGLEBIT DACS

.

EASY IMPLEMENTATION OF AUTOSTAN­DARDMODE

.

ADVANCED OPERATING MODE FOR FULL
CUSTOMIZATION

.

SIFAGC WITHWIDE RANGE

STV8203

PRELIMINARY DATA

SHRINK42

(Plastic Package)

ORDER CODE : STV8203

DESCRIPTION

The STV8203provides all the necessary circuitry
for demodulationof all Nicamand Germanstereo
audiotransmission. It is very suitable forTV appli­cationsas well as for VCR, Personal Computer or
Set Top Box applications. Different transmission
standardsare automaticallydetectedand demodu­lated without user intervention. The recovered
audio signals can be made available in analog
form. More, the STV8203integrates an audio ma­trixwith a THRU modewhen the IC is in stand-by.
Very flexible applications are possible thanks to
smart I
appropriateaudio processingICs.

January 1999

This is advance information on a new product now in developmentor undergoing evaluation. Detailsare subject to change without notice.

2

C program modes and large choice of

TQFP44 (10 x 10 x 1.4mm)

(Full Plastic Quad Flat Pack)
ORDER CODE : STV8203D

1/31

STV8203

SDIP42PIN CONNECTIONS

CAP5

SIF1

CAP6

SIF2

GND3

MOUT

MIN

CAP8

LIL1

LIR1

GND4

LIL2

LIR2
CAP2
CAP1
AOL1

AOR1

CAP4
AOL2

AOR2

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21 22

CC

42 GND2
41

DV

DD5

REG

40

CAP3

39

NC

38

SCL

37

SDA

36

NOT USED

35

XIN

34

XOUT

33

GND1

32

NC

31

NC

30

NC

29

NC

28

NC

27

NC

26

NC

25

NC

24

RESET

23

CAP7AV

8203-01.EPS

TQFP44PIN CONNECTIONS

MOUT

MIN

CAP8

LIL1

LIR1

GND4

LIL2

LIR2
CAP2
CAP1
AOL1

2/31

GND3

SIF2

SIF1

CAP6

12
13
14
15
16
17
18
19
20
21
22

23 24 25 26 27 28 29 30 31 32 33

AOL2

CAP4

AOR1

AOR2

CAP5

NC

GND2

CC

AV

DD5

DV

CAP7

CAP3

REG

NC

RESET

NC

NC

NC

1234567891011

44
43
42
41
40
39
38
37
36
35
34

NC

SCL
SDA
NOT USED
XIN
XOUT
GND1
NC
NC
NC
NC
NC

8203-02.EPS

PIN LIST

Pin Number

SDIP42 TQFP44

1 7 CAP5 Analog Decoupling for ADC SupplyRegulator Output
2 8 SIF1 Analog Subcarrier 1 Input
3 9 CAP6 Analog Decoupling for Input Amplifier Reference
4 10 SIF2 Analog Subcarrier 2 Input
5 11 GND3 Power Ground for Input Amplifier
6 12 MOUT Analog Mono Audio Output
7 13 MIN Analog Mono Audio Input
8 14 CAP8 Analog ADC VtopDecoupling

9 15 LIL1 Analog Line 1 Left Input (SCART 1)
10 16 LIR1 Analog Line 1 Right Input (SCART 1)
11 17 GND4 Power Audio Ground
12 18 LIL2 Analog Line 2 Left Input (SCART 2)
13 19 LIR2 Analog Line 2 Right Input (SCART 2)
14 20 CAP2 Analog Decoupling forAudio Matrix
15 21 CAP1 Analog Decoupling forBandgap Reference
16 22 AOL1 Analog Line 1 Left Output (SCART 1)
17 23 AOR1 Analog Line 1 Right Output (SCART 1)
18 24 CAP4 Analog Audio Matrix V
19 25 AOL2 Analog Line 2 Left Output (SCART 2)
20 26 AOR2 Analog Line 2 Right Output (SCART 2)

- 27 NC - Not Connected
21 28 AV
22 29 CAP7 Analog Decoupling forDigital Regulator Output
23 30 RESET Input Power On Reset
24 31 NC - Not Connected
25 32 NC - Not Connected
26 33 NC - Not Connected
27 34 NC - Not Connected
28 35 NC - Not Connected
29 36 NC - Not Connected
30 37 NC - Not Connected
31 38 NC - Not Connected
32 39 GND1 Power Digital Ground
33 40 XOUT Analog Crystal Oscillator Output
34 41 XIN Analog Crystal OscillatorInput
35 42 Not used Input To be connected to ground
36 43 SDA Bi-directional I
37 44 SCL Input I

- 1 NC - NotConnected
38 2 NC - Not Connected
39 3 CAP3 Analog Decoupling for Digital 3V (regulator output)
40 4 REG Analog Base Drive for External Regulator Transistor
41 5 DV
42 6 GND2 Power Digital Ground

Name Type Function

(5V)

DD

CC

DD5

Power Audio Matrix Supply

2

C SerialData

2

C SerialClock

Power 5V Supply

STV8203

8203-01.TBL

3/31

STV8203

BLOCKDIAGRAM

SIF1
SIF2

ANALOG

SWITCH

AGC

Sub

IN

DEMODULATOR CORE *

XTAL

DV

AV

DD5

CC

CRYSTAL

OSCILLATOR

POWER SUPPLY

REGULATORS

Digital
Analog

STV8203

* See Demodulator Core Block Diagram

DEMODULATORCORE BLOCKDIAGRAM

Sub

ADC

IN

BAND
PASS

FM

DISCRIMINATOR

FM / NICAM

2

AUDIO MATRIX

22

PRE-SCALING

MONO IN

SCART1 IN L

SCART1 IN R

NOISE*

ESTIMATION

SCART2 IN L

L1, R1

(L1 + R1)/2

SCART2 IN R

2

C BUS

I

INTERFACE

2

2V

2

2V

1V

SIGNAL

SHAPING

RMS

RMS

RMS

PRE-SCALING

SDA
SCL

SCART1 OUT L
SCART1 OUT R
SCART2 OUT L
SCART2 OUT R

MONO OUT

ONE BIT

SIGMA
DELTA

DAC

8203-03.EPS

Channel 1

* Data also available throught I

4/31

LEVEL *

ESTIMATOR

BAND
PASS

DISCRIMINATOR

2

C Bus

FM

NICAM QPSK

AND

DECODER

SOUND STANDARD MANAGEMENT

IDENTIFICATION,

CHANNEL CONTROL, MUTE, ...

PILOT *

RECOGNITION

NOISE*

ESTIMATION

QPSK LOCK *

DETECTION

BIT ERROR

RATE *

DIGITAL CHANNEL MATRIX AND AUTOSWITCH

SIGNAL

SHAPING

2

I

C Bus

ONE BIT

SIGMA
DELTA

PRE-SCALING

DAC

Channel 2

8203-04.EPS

FUNCTIONAL DESCRIPTION

Ascanbe seen fromthe blockdiagram,theinputto
the demodulatorsection is selectablefrom one of
twoI.F.sourcesviathe I

2

Cbus.Theselectedsignal
is then passed through an AGC block, having a
range of 28dB, before being digitised in the
ADCunit.Asinglequartzcrystal(suggestedvalue:
between24.712MHzand 27MHz)is usedforthe all
thedigitalprocessing,includingdemodulation,iden­tification, control, filtering. This has the advantage
ofa singleclocksignalsourceforthewholeICwhich
eliminates problems of multiple clock. The single
clock canbe chosento minimize interferencein the
TVIF andRF stagesof the tuner system.

Thedemodulatorsystemcan identifyand demodu­lateallthestandarddescribedintheTable1. There­sult of the recognition is flagged up to the host
system via the I

2

C buscommunicationsystem.

In the case of NICAM transmissions, in the event
of a failure of the received signal or a degradation
ofthe bit error rate (BER)belowa prescribedlevel,
thesystem will automaticallydefault to the reserve
soundtransmission on mono FM or AM.

For FM demodulation, the discriminator can nor­mallyhandlesignalshaving250kHzdeviation.This
covers all European standards, and ensure an
optimizedcompromise for thesignal to noiseratio
inonehand,andovermodulationintheotherhand.
However, it is possible to extand the deviation
rangeupto 500kHz(I

2

Cprogrammable)in orderto

coverrequests of some broadcasters.
Fully automatic standard recognition and setting

canbe achieveusing simple routines.
Figure1 : AudioMatrix

2

DAC

LI2(SCART2)

MIN

LI1(SCART1)

MUTE

2

S1

GAIN

± 6dB

2

S2

Appropriate de-emphasis networks in the digital
domain are applied to the resulting demodulated
signals (50µs, J17), followed by dematrixing if re­quired. The digital datastream is then passed
through2 x 16bits DACs before the audio matrix.

All thisfirst section is workingat 3.3Vthanks to an
integratedvoltageregulator.In stand-bymode,the
voltage regulator pulls the voltage down to zero,
ensuringno power dissipationin thispart.

An audio matrix allows the selection of inputs ap­pliedontheoutputsSCART1,SCART2andMONO
accordingto the diagram shown in Figure1.

The ”MOUT”outputs eitherthe signal L1, or R1 or
(L1+R1)/2.Thisallowstorecordtheselectedchan­nel in monomode, for exampleon thelinear chan­nel of a VCR simultanously with the stereo mode.
Maximumoutput swingis 1V

RMS

.

The audio matrixsection has its own power supply
regulator,allowing to keep this part working even
when the rest is instand-bymode. Thisachievesa
”THRU” mode from input ”SCART1” to output
”SCART2”andinput”SCART2”tooutput”SCART1”.

The maximumoutput swing of both SCART1 and
SCART2is 2V

RMS

.

Remark : Circuit operationis possible with only a
single5V supply.In thiscase, the AV

CC

is connectedto 5V.Maximumoutput swingis then
limitedto 1V

anda 6dBattenuationis automat-

RMS

ically added to the DAC output. In that case, the
resistorshown as R2 =39Ωin theApplicationDia­gram (between Pin 8 and Pin 21) must be replace
by a short circuit to avoid clipping.

MUTE

MUTE

L1/R1

L1,R1,

(L1 + R1)/2

SELECTOR

L2/R2

2

2

AO1(SCART1)

MOUT

AO2(SCART2)

STV8203

supplypin

8203-05.EPS

5/31

STV8203

FUNCTIONAL DESCRIPTION(continued)
Table1 :DemodulatedTV SoundNorms

Type

System Sound Type

FM mono 5.5

B/G

FM/NICAM 5.5 5.850 27 50 80 J17 40
FM 2 carriers A2 5.5 5.742 27 50 80 50µs 54.6875

B/H FM/NICAM 5.5 5.850 27 50 80 J17 40

FM mono 6.5

D/K

FM/NICAM 6.5 5.850 27 50 80 J17 40
D/K1 FM 2 carriers A2* 6.5 6.258 50µs 54.6875
D/K2 FM 2 carriers 6.5 6.742 50µs 54.6875

FM/NICAM 6.0 6.552 27 50 80 J17 100

I

FM mono 6.0 50µs

L NICAM 6.5 (1) 5.850 J17 40

M/N FM mono 4.5 (2) 15 25 50 (2)

Notes : 1. STV8203 performs only limitedAM demodulation. Report to Application Note.

2. 50µs only, instead of 75µs.

Name

Carrier 1

(kHz)

Carrier 2

(kHz)

FM Deviation (kHz)

Nom. Max. Over

Deemphasis Roll-off

Frequency

Pilot

(kHz)

6/31

USINGSTV8203
1 - Hardware

1.a - PowerSupplies (see Figure 2)

TheIC is usingtwo mainpower supplies:

-DV

supplies all the digital part V

DD5

Nom.

=5V.
This power supply can be switched-off in stand­by mode.

-AV

suppliestheaudio matrixpart : ifV

CC

Nom.

then the output voltage swing on outputpins can
reach2V

RMS

,ifV

swing on outputpins can reach 1V

=5Vthentheoutputvoltage

Nom.

RMS

.

Figure2

DV

DD5

41

DEMODULATION

ANDCONTROLPART

Pins5-32-42

GND

AV

CC

21

AUDIO

MATRIX

11

GND

=8V

STV8203

between stereo or mono signals in the playback
modein case of marginalnoise conditions.

1.d - Stand-by

Stand-bywith THRU mode : theanalogpartof the
device has its own power supply (AV
thispart to keepworkingevenwhenthedigitalpart,
powered by the 5V power supply (DV
stand-by.

In this case, the audio matrix is put in a special
setting:

- LIL1 to AOL2,

- LIR1 to AOR2,

- LIL2 to AOL1,

- LIR2 to AOR1,

- input gain = 0dB.
This allows to achieve a ”THRU” mode from

SCART1 input to SCART2 output and SCART2
input to SCART1 output, providing a copy facility
fromSCARTINto SCARTOUT.

8203-06.EPS

) allowing

CC

DD5

), is in

1.b- Sound Subcarrier Filters

Sound demodulation and decoding are very easy
withthisdeviceprovidingallthenecessaryfunctions
for that purpose, including the channel filters.
TheseFIRbase-bandfiltersgivethe bestselectivity
ofthedesiredchannelandprovidesinNICAMmode
thecorrectcosine roll-off response.

This implies that no external filters are required
(exceptmay be a simplehigh-passfilter,ifthe saw
filters and sound IF demodulators used in the ap­plicationcreate picture interferences).

Thefilterscan beautomaticallyset forB/G/H/I/L/L’
standards.They can alsobe easily tuned through

2

C for M, D, K, K1.

I

1.c- AudioMatrix

The mono output (MOUT) can output L1, R1 or
(L1+R1)/2 signal.A typicalapplicationis the possi­bilityto recorda selectedchannelin monomodeon
thelineartrackofa VCRseparatelyfromtherecord­ingofthestereosignal,providingthefacilitytoselect

2 - Software

Twomodes of operationare available:

2.a - OptimizedProgram Mode

Fourstandardshavedefaultsettingstoredin order
to allow a very easy programmation. Only some
registersmay have to be programmed(these reg­istersare shownin bold in theFigure3)but inmost
cases, the reset values will be sufficient. In Fig­ure3, CTLand STATrepresentregisterswhich are
controlledby the ”standardprocessor”.These reg­isters are located between address 23Hex and
3CHex in thecomplete list of registers.

2.b - AdvancedOperationMode

In that mode, all the read/write registers (as men­tionned in the complete list) can be programmed
manuallyand changedfromtheir reset values.

The additionnal registers accessible in this mode
are shown in bold in Figure 4. This mode can be
selectedby putting the bits [3:0] of AO-CONTROL
registerto 0.

7/31

STV8203

USINGSTV8203 (continued)
Figure3 : Optimized Program Mode

IF1
IF2

INPUT

SWITCH

PRE-LINE-IN

STAT

AGC

AO-STAT0
AO-STAT1
AO-STAT2

AUTO

STANDARD

AO-CONTROL

AO-TIMEOUT

ADC

LEVEL

DETECTOR

AGCC
AGCS

CTL

CH1

DCO

COARSE

CTL

CH2

DCO

COARSE

Figure4 : AdvancedOperation Mode

IF1
IF2

INPUT

SWITCH

AGC

ADC

CH1

CHANNEL

FILTERFIR1

CTL

DCO
FINE

CTL

CHANNEL

FILTERFIR2

CTL

DCO
FINE

CTLCTL

CHANNEL

FILTERFIR1

ZWEITON

CTL

AGC

INPUT

CETH2
SQTH2

CLOCK

CONTROL

PLL

DEMODULATOR

FM

CETH1 - SQTH1

STAT

ZWEITON

DETECTOR

PLL

DEMODULATOR

FM/QPSK

NICON

STAT(2)

PLL

DEMODULATOR

FM

NICAM

DECODER

STAT

STAT

STAT

CRF1

FM

PRESCALE

PRE-FM

NICAM

PRESCALE

PRE-NICAM

AUDIO

MATRIX

PRE-LINE-IN

AUD-MX-CNT

DE-EMPHASIS

SWITCHDE-MATRIX

CTL

AUDIO

MATRIX

To
DAC’s

8203-07.EPS

PRE-LINE-IN

STAT

(1),(2) or (3)

FFFIXL

FFFIXH

FCFIX

(1)

Bitsin AO-STAT0
(2) Bitsin AO-STAT1
(3) Bitsin AO-STAT2

AO-STAT0
AO-STAT1
AO-STAT2

AUTO

STANDARD

AO-CONTROL

AO-TIMEOUT

CLOCK

CONTROL

LEVEL

DETECTOR

AGCC

AGCS

CTL

SRF

DCO

CH2

DCO

DCO
FINE

FILTERFIR2

DCO
FINE

COARSE

COFQ1 FIFQ1

COARSE

COFQ2 FIFQ2

FIR1CO-7

CHANNEL

FIR2CO-7

ZWEITON

IAGCR
IAGCC

AGC

INPUT

IAGCS

CETH1- SQTH1

ACOEFF1 - BCOEFF1

STAT(2)

ZWEITON

DETECTOR

STAT(2)

PLL

DEMODULATOR

FM/QPSK

CETH2
SQTH2

ACOEFF2
BCOEFF2

SCOEFF

NICAM

DECODER

NICON ERR-

COUNT

PRE-LINE-IN

AUD-MX-CNT

FMDC1/2 STAT(1)

FM

PRESCALE

PRE-FM

CRF2

STAT(3)

NICAM

PRESCALE

PRE-NICAM

DE-EMPHASIS

SWITCHDE-MATRIX

STD-CT-IIS

To
DAC’s

8203-08.EPS

8/31

USINGSTV8203 (continued)
3 - Example of Applications

3.a - VeryLow Cost TVApplication

Figure5

2

C Control

I

STV8203

TUNER1

QSS I.F.

AM

DEMODULATOR

3.b- High-End TV Application

Figure6

TUNER 1

QSS I.F.

TUNER 2

QSS I.F.

AM

DEMODULATOR

MULTISTANDARD

MULTISTANDARD

2

C Control

I

SOUND

PROCESSOR

STV8203

SOUND

PROCESSOR

STV8203

SCART1 SCART2

AUDIO

PROCESSOR

SURROUND/KARAOKE

SRS

TDA7466

AUDIO
AMPLIFIER

TDA7495

2x7W

8203-09.EPS

R

2 x 25W

L

3.c - TVApplication in PC

Figure7

DEMODULATOR

SCART1 SCART2

I2C Control

TUNER1

QSSI.F.

TUNER2

QSSI.F.

MULTISTANDARD

SOUND

PROCESSOR

STV8203

AM

I2S Bus

Analog

AudioOut

8203-10.EPS

AUDIO
AMPLIFIER

TDA7495

8203-11.EPS

9/31

STV8203

ABSOLUTE MAXIMUMRATINGS

Symbol Parameter Value Unit

AV

DD5

DV

DD5

AV

CC

P

tot

T

oper

T

stg

THERMAL DATA

Symbol Parameter Value Unit

R

th (j-p)

RECOMMENDEDOPERATING CONDITIONS

Symbol Parameter Min. Typ. Max. Unit

AV

DD5

DV

DD5

AV

CC

Analog Supply Voltage 7 V
Digital Supply Voltage 7 V
Scart Interface Supply Voltage 9.5 V
Power Total Dissipation 0.8 W
Operating Temperature 0, +70
Storage Temperature -20, +150

Junction to PinsThermal Resistance Max.

Analog V
Digital V

DD

DD

Audio Interface Supply for 2V

for 1V

RMS
RMS

SDIP42
TQFP44

outputs
outputs

4.75 5.0 5.25 V

4.75 5.0 5.25 V

7.6

4.75

55
68

8.0

5.0

8.4

5.25

o

C

o

C

°C/W
°C/W

V
V

8203-02.TBL

8203-03.TBL

8203-04.TBL

ELECTRICAL CHARACTERISTICS (T

=25oC, unless otherwise specified)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

GENERAL

I

I

Input Currenton AV

AIN

DIN

CC

AVCC=5V

=8V

AV

CC

DV

= 5V 120 mA

DD5

58
75

IF INPUTS

R
C

Input Resistance 6 kΩ

IN

Input Capacitance 10 pF

IN

SWISO Switch Isolation f = 10MHz 40 dB

SIF FR Input Frequency Range For FM demodulation 4 8 MHz

V

IN (Min.)

V

IN (Max.)

Minimum InputLevel
Maximum Input Level

25

630

mV
mV

AGC AGC Range 28 dB

mA
mA

RMS
RMS

8203-05.TBL

10/31