Datasheet STV8203 Datasheet (SGS Thomson Microelectronics)

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

STV8203

ELECTRICAL CHARACTERISTICS (T

=25oC, unless otherwise specified) (continued)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

FM DEMODULATION PATH (see Figure8)

f

RESP

SNR FM Signal to Noise 100mV

THD FM Total Harmonic Distortion Output signal 1V

SEP FM German Stereo Channel

Frequency Response 20Hz - 15kHz -1.0 +1.0 dB

, unweighted20Hz-15kHz,

RMS

Output 2V

50kHz FM deviation

RMS

@ 1kHz

RMS

@ 1kHz,

65 dB

0.2 %

40 dB

Separation

AMR AM Rejection SIF = 100mV

30% modulation @ 1kHz

V

FMOUT

Maximum OutputSwing 2 V

RMS

60 dB

NICAM DEMODULATION PATH (see Figure8)

SNR NIC Signal to Noise 100mV

Output 2V

, unweighted20Hz-15kHz,

RMS

@ 1kHz

RMS

THD NIC Total Harmonic Distortion Output signal 1V

V

NICOUT

Maximum OutputSwing 2 V

@ 1kHz 0.07 %

RMS

72 dB

SEP NIC Channel Separation 60 dB

AUDIO MATRIX (see Figure 9)

RIN Input Resistance 30 kΩ

V

Input ClippingLevel AVCC=8V

CL

AV

CC

=5V

GMAT Prescaling = 0

=1V

V

IN

R

Output Resistance All audio output except Mono output

OUT

Mono output

, 15Hz to 15kHz

RMS

SNR Signal to Noise Ratio Preline in = 0,

=2V

V

OUT

RMS

XLR Audio L to R Channel Crosstalk

2V

@ 1kHz

X12 Audio Crosstalk from Channel 1

RMS

2
1

-0.5 0 0.5 dB

200
400

90 dB

,unweighted 20Hz-15kHz

60 dB
80 dB

V
V

to Channel 2

RMS

RMS

RMS
RMS

Ω
Ω

8203-06.TBL

Figure8 : SynopticA

SIF1

Figure8 : SynopticA

AIL1 or 2

or

AIR1 or 2

DIGITAL

DEMODULATATION

STV8203

STV8203

DAC

Analog
Switch

Analog

Switch

AOL1
or AOR1

8203-12.EPS

AOL1or 2
or
AOR1 or 2

8203-13.EPS

11/31

STV8203

PROGRAMMING THE DEVICE

2

1-I

C Addressand Protocol

Write

S 80 A SUB-ADDRESS A DATA A DATA A P

Read

S 80 A SUB-ADDRESS A P S 81 A DATA A DATA N

S = Start, A= Acknowledge, P =Stop, N = No acknowledge.
Sub-addressis the registeraddresspointer ; thisvalue auto-incrementsfor bothwrite and read.

2 - List of Registers

Registersnot controlled by AUTOSTANDARD, except bits marked ”*” which are controlled

Name

SWD (Switch, Dematrix & De-emphasis)

PRE-FM 2 0001 1101 0 0 0 Fm Prescale [4:0]
PRE-NICAM 3 0001 1101 0 0 0 Nicam Prescale [4:0]
STD-CT-IIS 4 0001 1000 0 0 gain demoff mute * SWD [2:0] *
FMDC1 5 read only FM DC level 1
FMDC2 6 read only FM DC level 2

AUDIO MATRIX

PRE-LINE-IN 7 0000 1000 IF Switch AGC
AUD-MX-CNT 8 0010 0010 mout1 S1 o/pselect mout0 S2 o/p select

NICAM

NICON 9 0000 0000 dif-pol 0 TSCTRL [1:0] ECT MAE 0 0
ERR-COUNT A read only error [7:0]

AUTOSTANDARD

AO-STAT0 B read only std-det sid1 sid0 aomute am-mono SWD [2:0] (monitor)
AO-STAT1 C read only fm2-car fm2-sq fm1-car fm1-sq qpsk-lk zw-det zw-st zw-dm
AO-STAT2 D read only nic-det f-mute LOA Nicam CBI [4:1] n-mute
AO-CONTROL E 0001 1111 muteov mono ov unmute C4 ov standard check [3:0]
AO-TIMEOUT F 1010 0101 Time 2 setting (1280ms) Time 1 setting (160ms)

ZWEITON

ZWEITON 10 1000 1000 Thresh-Sig [3:0] Thresh-ST [3:0]

DEMODULATOR

AGCC 11 0001 0001 agc-cmd* 0 0 agc-ref [2:0] agc-cst[1:0]
AGCS 12 0100 00xx 0 agc-err [4:0] sig-ovr sig-und
IAGCR 14 1000 1000 Iagc-ref [7:0]
IAGCC 15 0000 0011 iagc-off* 0 0 0 0 Iagc-cst[2:0]
IAGCS 16 read only Iagc-Ctrl [7:0]
FFFIXL 17 0000 0000 Clock Generator Fine Frequency (8 lsb’s)
FFFIXH 18 01101110 0 demod mode M2:M0* clock gen fine freq (4 msb’s)
FCFIX 19 0001 0001 0 0 Clock Generator Coarse Frequency
CRF2 20 0000 0000 Channel 2 CarrierRecovery Frequency
CETH2 21 0011 0101 Channel 2 carrier-th[7:0]
SQTH2 22 0011 1100 Channel 2 squelch-th[7:0]
Range of Registers Controlled by AUTOSTANDARD Function (address 23 Hex to 3CHex)
CRF1 3D 00000000 Channel 1 CarrierRecovery Frequency
CETH1 3E 0011 0101 Channel 1 carrier-th[7:0]
SQTH1 3F 0011 1100 Channel 1 squelch-th [7:0]

Addr.
(Hex)

Reset

(Bin)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

Switch off

Register Function /Description

0 0 Line Inputs Gain[3:0]

12/31

PROGRAMMING THE DEVICE (continued)

Registerscontrollableby AUTOSTANDARD

Name

DEMODULATOR CHANNEL 2

FIR2CO 23 0000 0000 FIR2 coefficient 0
FIR2C1 24 0000 0000 FIR2 coefficient 1
FIR2C2 25 0000 0000 FIR2 coefficient 2
FIR2C3 26 0000 0000 FIR2 coefficient 3
FIR2C4 27 1111 1111 FIR2 coefficient 4
FIR2C5 28 0000 0100 FIR2 coefficient 5
FIR2C6 29 0001 0100 FIR2 coefficient 6
FIR2C7 2A 0010 0101 FIR2 coefficient 7
COFQ2 2B 0000 1100 0 0 Channel 2 DCO Coarse Frequency
FIFQ2 2C 1100 0100 Channel 2 DCO Fine Frequency (8lsb’s)
ACOEFF2 2D 1001 0000 dmd sw2 0 Coarse A2 Sign A2 Fine A2
BCOEFF2 2E 1010 1100 sat sw2 0 dco2 gain B2
SCOEFF 2F 0001 1100 dmx-of 0 plf_A plf_B
SRF 30 0000 0000 Symbol Recovery Frequency

DEMODULATOR CHANNEL 1

FIR1CO 31 0000 0000 FIR1 coefficient 0
FIR1C1 32 1111 1110 FIR1 coefficient 1
FIR1C2 33 1111 1100 FIR1 coefficient 2
FIR1C3 34 1111 1101 FIR1 coefficient 3
FIR1C4 35 0000 0010 FIR1 coefficient 4
FIR1C5 36 0000 1101 FIR1 coefficient 5
FIR1C6 37 0001 1000 FIR1 coefficient 6
FIR1C7 38 0001 1111 FIR1 coefficient 7
COFQ1 39 0000 1011 0 0 Channel 1 DCOCoarse Frequency
FIFQ1 3A 1100 0111 Channel 1 DCO Fine Frequency (8lsb’s)
ACOEFF1 3B 0010 0011 dmd sw1 0 Coarse A1 Sign A1 Fine A1
BCOEFF1 3C 0001 0010 sat-sw1 0 dco1 gain B1

Addr.

(Hex)

Reset

(Bin)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

Register Function/Description

STV8203

Note : This register must be kept to ”0”.

RESERVED 1 00000000 0 0000000

13/31

STV8203

PROGRAMMING THE DEVICE (continued)
3 - RegisterDescription

3.1 - RegistersNot Controlled By Autostandard(except some mentionedbits)

PRE-FM(Prescale FM Level)

Address : 02
Type : R/W
Reset : 0001 1101

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 0 FM PRESCALE

FMPRESCALE : 00000

01100
10100

0dB

+12dB

-12dB

(stepsize = 1dB,range = ±12dB in 2’s complement)

Sets the reference level for an FM signal. Note, this is also dependant on the PLL programming. For
example,with default settings forthe PLL, an FM deviationof 27kHz will result in a signal17dB below full
scalebeforede-emphasis. At1kHz, the internalde-emphasisgain is14dB giving a levelof -3dB.Fullscale
output from the DAC is 2V

correspondingto 0dB.and so for 1V

RMS

, PRE-FMshould be set to -3dB.

RMS

PRE-NICAM (PrescaleNICAM Level)

Address : 03
Type : R/W
Reset : 0001 1101

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 0 NICAM PRESCALE

NICAMPRESCALE : 00000

01100
10100

0dB

+12dB

-12dB

(step size = 1dB, range= ±12dB in 2’s complement)

Sets the reference level for a NICAM signal. For example, a full scale NICAM signal at 1kHz would be
received at -12dB before de-emphasis. Internal de-emphasis gainat this frequencyis 9dB so for 1V

RMS

pre-nicamshould be set to -3dB.

,

14/31

STV8203

PROGRAMMING THE DEVICE (continued)

STD-CT-IIS

Address : 04
Type : R/W
Reset : 0001 1000

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

GAIN : whichshould normallybe set to itsdefault value, can be used to changethe dematrixgain

DEMOFF : bypassesthe FM or Nicam de-emphasis: 1 =de-emphasisoff
MUTE : mutes the DAC(FM or Nicam) : 1 = DAC muted

SWD : Bits allow control of the modeof the switch/dematrixfunction as shownbelow.

(SWDControl)

0 0 GAIN DEMOFF MUTE SWD

for CH1 = L+R.
dematrixgain : 0 : channel1 = L/2+R/2,1 : channel1 = L+R

(onlyeffective if the AUTOSTANDARDfunction is off)
(onlyeffective if the AUTOSTANDARDfunction is off)

[2:0] De-emphasis Description NICON[1:0] Left Right

000
001 Zweiton mono X D1 D1

010 Zweiton dual mono

011 Zweiton stereo X DSL DSR
100 not used
101

110 Nicam dual mono

111 Nicam stereo X NSL NSR

50µs

J17

FM CH1 mono X D1 D1

00 D1 D2
01 D2 D2
10 D1 D1
11 D2 D1

Nicam mono X N1 N1

00 N1 N2
01 N2 N2
10 N1 N1
11 N2 N1

D1 = FM audio from CH1,D2 = FMaudio from CH2, DS = dematrixedZweitonstereo.
N1 = NicamM1, N2 = Nicam M2, NS = Nicamstereo.
These bits are controlledby AUTOSTANDARDwhen this function is activated.

FMDC1, FMDC2

(FM DC Level)

Address : 05-06
Type : R

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

FM DC LEVEL 1 OR FM DC LEVEL 2

FMFrequencyoffset (dependenton thePLL coefficients).
This value (2’s complement) is proportional to the DC offset, measured below 20Hz, of an FM signal. It
could be used to implement an AFC for FM signals.

15/31

STV8203

PROGRAMMING THE DEVICE (continued)

PRE-LINE-IN

Address : 07
Type : R/W
Reset : 0000 1000

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

IF SWITCH AGC SWITCH OFF 0 0 LINEINPUTS GAIN

IF SWITCH : IF InputSwitch
AGC SWITCHOFF : can be used to switch-offthe AGC amplifier..

LINEINPUTS GAIN : allow the levels of the analog line inputs (SCART1, SCART2and MONO) to be

AUD-MX-CNT (AudioMatrix Control)

Address : 08
Type : R/W
Reset : 0010 0010

(IF Input Selectionand Audio Matrix Gain Control)

controlsthe IF inputselection (0 = IF1).

adjusted simultaneously.
1000
0010
1110

0dB

-6dB

+6dB

(defaultsetting)

(step size = 1dB, range=±6dB)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

MOUT1 S1 O/P SELECT MOUT0 S2 O/P SELECT

These8 bits are usedto controlthe audiomatrixconfiguration(see Figure1).

Data bits Actual Function Selected

76543210Reset : AO1 and AO2 = DAC and MOUT = (L1+R1)/2

XXXXX000AO2=Muted
XXXXX001AO2=Muted
XXXXX010AO2=AO1(reset state)
XXXXX011AO2=LI1(Scart 1 input)
XXXXX100AO2=Muted
XXXXX101AO2=Muted
XXXXX110AO2=Muted
XXXXX111AO2=Muted
X 0 0 0 X X X X AO1 = Muted
X 0 0 1 X X X X AO1 = MIN
X 0 1 0 X X X X AO1 = DAC (reset state)
X 0 1 1 X X X X AO1 = Muted
X 1 0 0 X X X X AO1 = LI2 (Scart 2 input)
X 1 0 1 X X X X AO1 = Muted
X 1 1 0 X X X X AO1 = Muted
X 1 1 1 X X X X AO1 = Muted

0 X X X 0 X X X MOUT = (L1+R1)/2 (reset state)
0XXX1XXXMOUT=R1
1XXX0XXXMOUT=L1
1 X X X 1 X X X Notused

16/31

STV8203

PROGRAMMING THE DEVICE (continued)

NICON

Address : 09
Type : R/W
Reset : 0000 0000

DIF-POL : controls the polarity of the Q channelin the DQPSKdecoder.Its default value is correctfor

TSCTRL : These two bits are programmed to chose the decision mode for the zweiton detector as

ECT : bit error rate counting time : 0 = 128ms,1 = 64ms
MAE : max allowed errors : 0 = 511,1 = 255

(NICAMControl)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

DIF-POL 0 TSCTRL ECT MAE 0 0

NicamB/G/L and so doesnot need to be changed.

following:
00

:

2 decisionswith 1024 samples accumulation

01

:

3 decisionswith 1024 samples accumulation

10

:

2 decisionswith 2048 samples accumulation

11

:

3 decisionswith 2048 samples accumulation

Bits2 and3 adjustthebit error rate(approximate)atwhichtheNicam decodermutes;a fixed
hysteresis is provided so that the decoder will unmute only when the BER hasdropped to
one quarter of that for muting :

ECT MAE BER Muting Threshold

0 0 1 in 112
0 1 1 in 224
10 1in56
1 1 1 in 112

ERR-COUNT

(NicamError Counter)

Address : 0A
Type : R

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

ERROR

ErrorSignals Count (averagedover timeECTabove)
Thevalue in this register,updated every 64msor 128ms,gives anindication of theNicam bit error rate. It

canthereforebe usedto mutethe decoderat an errorrate below 1 in 56 (=FF if ECT=64ms).

17/31

STV8203

PROGRAMMING THE DEVICE (continued)

AO-STAT0

Address : 0B
Type : R

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

STD-DET SID1 SID0 AOMUTE AM-MONO SWD (MONITOR)

STD-DET : StandardDetection :

SID [1:0] : StandardIdentification of the demodulatorinput

AOMUTE : Audio Output Mute

AM-MONO : AM selected

SWD : Switch DematrixMode

(AUTOSTANDARDStatus 0)

0 = no standard detected
1 = indicatesthat an expectedstandard has beenidentified.

indicatethe standardwhich has been identified :

SID[1:0] Standard

00 I FM/NICAM
01 B/G FM - Zweiton
10 B/G FM/NICAM
11 L/L’ AM/NICAM

indicatesthat the audiooutputs are muted(=1); onlywhen the demodulatoris selected as
audio source. This wouldbe the case during standardsearch or no signal found.

indicates if the AMinput (MIN) has been selected(=1); normallyused for system L.

indicatethe setting of the SWD block:

SWD[2:0] Mode description De-emphasis

000 FM CH1 mono
001 Zweiton mono (CH1)
010 Zweiton dual mono
011 Zweiton stereo
100 Unused Unused
101 NICAM mono
110 NICAM dual mono
111 NICAM stereo

50µs

J-17

AO-STAT1 (AUTOSTANDARD Status 1 ; demodulatorsignal detectors)

Address : 0C
Type : R

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

FM2-CAR FM2-SQ FM1-CAR FM1-SQ QPSK-LK ZW-DET ZW-ST ZW-DM

FM2-CAR : FM2 CarrierDetector Lock
FM2-SQ : FM2 Squelch Detector Lock
FM1-CAR : FM1 CarrierDetector Lock
FM1-SQ : FM1 Squelch Detector Lock
QPSK-LK : QPSKLock
ZW-DET : ZweitonPilot Lock
ZW-ST : Zweiton Stereo Lock
ZW-DM : Zweiton Dual Mono Lock

This registerallows direct access to the demodulatorsignal detectors; 1 = detected.

18/31

STV8203

PROGRAMMING THE DEVICE (continued)

AO-STAT2

Address : 0D
Type : R

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

NIC-DET F-MUTE LOA NICAM CBI N-MUTE

NIC-DET : NICAM detected
F-MUTE : Frame Mute
LOA : Loss of frame Alignmentword

NICAMCBI : indicates the receivedNICAM control bitswith the followinginterpretation:

(AUTOSTANDARDStatus 2 ; NICAM)

indicates a validNICAM signal found(1 = detected).
indicatesthe NICAMdecoder is mutedbecausethe superframealignment has been lost.
indicateslossof alignmenttothe framealignment wordin the NICAMdecoder;thebiterror

rate istoo highor no signal is present.

CBI[4:1] Nicam Signal Description

X000 Stereo
X001 ch1 = mono, ch2 = data
X010 Dual Mono

X011 704Kbit/sdata
X1XX FM selected during additional coding options
0XXX Nicam different to FM mono
1XXX Nicam mono(M1) or stereo = FM mono

N-MUTE : NICAM Mute

indicates that the NICAMdecoder is muted(it may be unmutedby AO-CONTROL bit 5).

19/31

STV8203

PROGRAMMING THE DEVICE (continued)

AO-CONTROL(AUTOSTANDARDControl)

Address : 0E
Type : R/W
Reset : 0001 1111

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

MUTE OV MONO OV UNMUTE C4 OV STANDARD CHECK

AUTOSTANDARD controls the audio matrix when the user has selected the DAC as source(AUD-MX­CNT bits[6:4] = 010).In thiscase it will mute theoutputs or select MIN. These functionscan be overriden
by bits 6 and 7 below.

MUTEOV : Mute override,1 = mute(overrideAUTOSTANDARD)

forcesthe audio signal to be muted.

MONOOV : FM/AM Mono override,1 = mono (overrideAUTOSTANDARD)forces

canbeusedto forceto analoguesound.This maybe usefulin thecaseof marginalNICAM
receptionto prevent automaticswitching.

AUD-MX-CNT bits[6:4] bit 7 bit 6 AO1 source

010 0 0 DAC

X 1 MIN (in case of L/L’ standard)

0 1 FM (in case of B/G or I standard)
1 1 Muted (in caseof B/G or I standard)
1 0 Muted

UNMUTE : Nicam Un-mute, 1 = unmute

allowsthe NICAMdecoder to be unmutedif the bit errorrateis higherthanthe preset limit;
this overrides the automatic switching to FMor AM which would normally occur.

C4 OV : CBI4 override, 1 =>CBI[4] forced to 1 internally

is usedto overridethe 4th NICAM controlbit (reservesound switch) if required.Thisbit is
transmitted by the broadcaster to indicatethat the analoguesound carrier is a backupof
the NICAM signal; this is usually the case. If the NICAM signal fails, the STV8203 will
automaticallyswitch to backup sound if the received bit was set to 1. If thisbit was set to
0 and bit 4 set to 0, the decoder will stay switched to analogue sound. If bit 4 is setto 1,
the received CBI4 is ignored. Note that if automatic standard is off, switching between
analogueand NICAMaudio must be done manually.

STANDARD
CHECK

: Controlthechoiceoftransmi ssionstandardstobesearchedforbytheautomaticstandar dfuncti on

(standardsearchactivewhenbit=1).Themorechoices,thelongerthesearchtime.Ifthesystem
in use canbe identifi ed by the charac teristi csof the vid eo signal, for exampleby the chroma
demodulator,thenonlya singlebitneedsto be set.In thiscase,theAUTOSTANDARDfuncti on
willprogramthedemodula torforthechosenstandard.Ifnobitsareset,theAUTOSTANDARD
functionis disabledandallregistersneedtobe setmanually.
bit 3- Runcheck for standard3 (L/L’- AM/NICAM)
bit 2- Run Check for Standard 2 (B/G - FM/NICAM)
bit 1- Run checkfor standard1 (B/G - Stereo)
bit 0- Run checkfor standard0 (I - FM/NICAM)

AO-TIMEOUT

(AUTOSTANDARDTimer Adjustment)

Address : 0F
Type : R/W
Reset : 1010 0101

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

TIME 2 SETTING TIME 1 SETTING

Time1 is used for NICAM and FM mono validation and time 2 for Zweiton. If the standard is not found
within this time limit, the next standard will be tried. Time 1 = decimal [bit 3:0] x 32ms. Time 2 = deci­mal[bit 7:4] x 128ms. Time 1 defaultvalue is 160ms.Time 2 defaultvalue is1280ms.

A time of 0ms should not be programmed.

20/31

STV8203

PROGRAMMING THE DEVICE (continued)

ZWEITON

Address : 10
Type : R/W
Reset : 1000 1000

THRESH-SIG : PilotCarrier Level Threshold
THRESH-ST : Detected Tone Level Threshold

Poweron default values give a detectionthreshold correspondingto a modulatedpilot carrier S/N of 0dB
(700HzBW)and a S/Nof 40dB forthe recovered audio.

AGCC(AGC Controlfor ADC)

Address : 11
Type : R/W
Reset : 0001 0001

AGC-CMD 0 0 AGC-REF AGC-CST

(Pilot Carrier and Tone DetectorThresholds)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

THRESH-SIG THRESH-ST

Set the sensitivityfor the pilot carrierdetector.
Set the detectionthresholdlevel forstereo and dual mono (bi-lingual) tones.

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

AGC-CMD : 1 = manual/forced mode, 0 = automaticmode

Normallyset to0 enablingautomaticmode. In the case of systemL/L’,due to the presence
of the AM sound carrier, the AGC should be switched off. In this case, a fixed gain value
should be set using the AGCS register(see below).
This bit is controlledby AUTOSTANDARDwhen thisfunctionis activated.

AGC-REF : Defines the clippinglevel.

Adjustthe allowableproportion of samplesat the input of the ADC which will be clipped;the
AGC tries to maximise the use of the full scale range of the ADC.The defaultsetting gives
a ratio of 1/256.

AGC-REF [4:2] Clipping Ratio

000 1/16 (single carrier)
001 1/32
010 1/64
011 1/128
100 1/256
101 1/512
110 1/1024
111 1/2048 (multiple carriers)

AGC-CST : AGC time constant betweeneach stepof 1.25dB.

For a 27MHzXTAL=> 00 = 1.21ms, 01 = 2.43ms,10 =4.85ms, 11 = 9.7ms.
The adjustmentis a compromisebetween settling time and noise immunity.

21/31

STV8203

PROGRAMMING THE DEVICE (continued)

AGCS

Address : 12
Type : R/W
Reset : 0100 00XX

AGC-ERR : Gain Control Signal of amplifierbefore ADC. Thereare 32 steps of 1.25dB.

SIG-OVR
SIG-UND

IAGCR

Address : 14
Type : R/W
Reset : 1000 1000

(AGCControland Status for ADC)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 AGC-ERR SIG-OVR SIG-UND

AGC-ERR [6:2] Gain (dB)

00000 0
00001 1.25

..... .....

11110 37.50
11111 38.75

When AGC_CMD= 0, AGC-ERRcan be read thusindicating the input level. It can alsobe
written to thus presettingthe AGC level which will then adjust itself to the finalvalue. When
AGC_CMD = 1, the AGC is off and thus writing to AGC-ERR directly controls the AGC
amplifier gain.Reading AGC_ERR just confirmsthe fixedvalue.

: 1 = agc overloaded - signaltoo BIG

1 = agc under loaded- signaltoo SMALL
When the AGC is in automaticmode (agc_cmd=0),bit 0 indicatesif the input signal is too
small and bit 1 if the AGC is too big. These bits couldbe used when setting the input level
to the STV8203.

(InternalAGC Referencefor QPSK)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

IAGC-REF

Sets the mean value of the internal AGC, used for QPSKdemodulation. The default setting corresponds
to half full scaleamplitude at thePLL input.

IAGCC

(InternalAGC TimeConstant for QPSK)

Address : 15
Type : R/W
Reset : 0000 0011

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

IAGC-OFF 0000 IAGC-CST

IAGC-OFF : 1 = Internalagc = off

Onlyenabledwhen AUTOSTANDARDis off. Normally, theinternal AGCshouldbe OFFfor
FM and ON for QPSK.
This bit is controlledby AUTOSTANDARDwhen thisfunctionis activated.

IAGC-CST : InternalAGC ProgrammableStep Constant.

Set the internal AGC time constant; the compromise is between fast settling time (for the
quickestNicam identification)and noiseimmunity. Thecontrolrange is about 45dB divided
into 0.2dB steps. These bits controlthe timeper step (valuesgiven for QPSKmode) :

AGC-CST [2:0] Step time(µs) Time Response (ms)

000 703 105
001 352 53

..... ..... .....

111 5.5 0.82

22/31

STV8203

PROGRAMMING THE DEVICE (continued)

IAGCS

Address : 16
Type : R

Indicatesthe valueof the internal AGC controlsignal.
Normally, the mean value should equal the value set in the IAGCR register when a signal is being
demodulated.

FFFIXL(ClockGenerator Fine frequency)

Address : 17
Type : R/W
Reset : 0000 0000

SeeFCFIX registerfor explanation.

FFFIXH

Address : 18
Type : R/W
Reset : 0110 1110

(InternalAGC ControlValue)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

IAGC-CTRL

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

CLOCK GENERATOR FINE FREQUENCY (8 LSB’s)

(Clock Generatorand Fine Frequency Control)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 DEMOD MODE M2:M0 CLOCK GEN FINE FREQ (4 MSB’s)

DEMODMODE M2:M0 : Controlsthe demodulatormode (only when registerEhex bits[3:0] = 0000):

MODE[6:4] CH1 FM CH2 FM/QPSK

X00 Normal FM Normal
X01 Wide FMWide
010 Normal QPSK System B/G/L
011 Wide QPSK System B/G/L
110 Normal QPSK System I
111 Wide QPSK System I

The FM discriminator modulationfull range can beset at :

- narrowmode : 250kHz(± 125kHz),

- widemode : 500kHz (± 250kHz).

CLOCKGEN FINEFREQ : Clock generator fine frequency (4 MSB’s)( seeFCFIX for explanation).

FCFIX (ClockGeneratorCoarse Frequency)

Address : 19
Type : R/W
Reset : 0001 0001

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 CLOCK GENERATOR COARSE FREQUENCY

Thebits [5:0]togetherwith FFFIXHbits [3:0] and FFFIXLbits [7:0]can be usedtoprogrammethe internal
clockgenerator for differentquartz crystal frequencies; thedefault value is for 27MHz.

P = 182 ⋅

Fref

Fqpsk

− 193 with Fref = crystalfrequency,Fqpsk =32 x 728kHz= 23.296MHz.

FCFIX= INT(P) (INT:integer part)
FFFIX= 256 x (16 x REM(P) - 1) (REM: fractionalremainder)

Notethat 0≤FFFIX<3840 so there is a small range of frequencieswhich cannot be used.
Example: Fref = 27MHz,FCFIX =17, FFFIX= 3584.

23/31

STV8203

PROGRAMMING THE DEVICE (continued)

CRF2 - CRF1

Address : 20-3D
Type : R/W
Reset : 0000 0000

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

Thisregister providesaccess to the instantaneousfrequencyof the PLL(2’s complement). If writtento, it
willpreset theDCO frequency;ifreaditprovidesthe instantaneousfrequencyoffsetof the PLL’sand could
be used for anAFC function.

CETH2- CETH1 (FM Carrier LevelThreshold)

Address : 21-3E
Type : R/W
Reset : 00110101

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

Theseregisters,which performthe same function in channel 1 and channel2, comparethe carrier levelin
thechannel againstthethresholdvalue.This level is measuredafter the channelfilter andis relativeto the
full scale reference level (0dB).

This is used as part of the validationof an FM signal,if the carrier level is below the threshold,the signal
is consideredto be non-valid.

(FM/QPSKPLL Demodulator Offset)

CHANNEL 2 orCHANNEL 1 CARRIER RECOVERY FREQUENCY

CHANNEL 2 orCHANNEL 1 CARRIER-THRESHOLD

CETH Threshold (dB)

255 -6
128 -12

64 -18
32 -24

.... ....

0 OFF

If CETH is OFF, any carrier level will be accepted.
Thereset valueis 53, itmeansa thresholdof -20dB.

SQTH2-SQTH1 (FM SquelchThreshold)

Address : 22-3F
Type : R/W
Reset : 00111100

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

CHANNEL 2 or CHANNEL 1 SQUELCH-THRESHOLD

Thesquelch detectormeasuresthe levelofhigh frequencynoise (>40kHz)and comparesit tothethreshold
SQTH.If the level is below this value, the S/N of the FM signalis consideredto be acceptable.

Valuesare given for FM with ±50kHzdeviation :

SQTH S/N (dB)

250 0
119 10

60 15
35 20
22 25

Thereset valueis 60, itmeansa SNR of 15dB.

24/31

STV8203

PROGRAMMING THE DEVICE (continued)

3.2 - RegistersControllable by Autostandard

FIR2C- FIR1C(FIR Coefficients)

Address : 23-24-25-26-27-28-29-2A & 31-32-33-34-35-36-37-38
Type : R/W

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

FIR2 or FIR1 COEFFICIENT 0
FIR2 or FIR1 COEFFICIENT 1
FIR2 or FIR1 COEFFICIENT 2
FIR2 or FIR1 COEFFICIENT 3
FIR2 or FIR1 COEFFICIENT 4
FIR2 or FIR1 COEFFICIENT 5
FIR2 or FIR1 COEFFICIENT 6
FIR2 or FIR1 COEFFICIENT 7

Eachdemodulator channelimplements a 16 tap symetricFIR filter,each with8 coefficients. Thefollowing
table givesthe defaultvalues providedby theAUTOSTANDARDfunction (∆F = 50kHzin FM mode).

Tap

Number

000000000
1 -2 0 -2 -2 -2 0 -2 0
2 -4 0 -4 -4 -4 -1 -4 -1
3 -3 0 -3 -3 -3 3 -3 3
42-1222020
5 13 4 13 13 13 -12 13 -12
62420242424102410
73137313131613161

System I FM/NICAM System B/G Zweiton System B/G FM/NICAM System L/L’ AM/NICAM

CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2

COFQ2- COFQ1 (DCOCoarse Frequency)

Address : 2B-39
Type : R/W
Reset : 0000 1100for COFQ2 - 00001011 for COFQ1

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

0 0 CHANNEL 2 or CHANEL 1 DCO COARSE FREQUENCY

SeeFIFQ1/2 below for explanation.

25/31

STV8203

PROGRAMMING THE DEVICE (continued)

FIFQ2- FIFQ1 (DCO FineFrequency)

Address : 2C-3A
Type : R/W
Reset : 1100 0100 for FIFQ2 - 11000111for FIFQ1

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

CHANNEL 2 or CHANNEL 1 DCO FINE FREQUENCY (8LSB’s)

TheDCO’s,whichare set to thecarrier frequencyto be demodulated,areadjustedin two partsas follows:

Fc

C =
Takethe nearest integer,Ci, for the 6 bits of theCOFQ register

F=(C−Ci
Takethe nearest integer,Fi, for the 8 bits of the FIFQregister.

Commonfrequencieswith Fs =27MHz :

⋅ 48, whereFc is the carrierfrequency,Fs isthe crystal frequency

Fs

9





2

) ⋅





3





Fc (MHz)

5.5 10 001010 -38 11011010

5.74 10 001010 35 00100011

5.85 10 001010 68 01000100

6.0 11 001011 -57 11000111

6.552 12 001100 -60 11000100

decimal binary decimal binary

Ci Fi

ACOEFF2 - ACOEFF1(PLL Loop Filter ProportionalCoefficient)

Address : 2D-3B
Type : R/W
Reset : 10010000 for ACOEFF2 - 00100011for ACOEFF1

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

DMD SW2 or 1 0 COARSE A2 or A1 SIGN A2or A1 FINE A2or A1

DMDSW : Mode switch : 0= FM, 1 = QPSK
COARSEA,

SIGNA,FINEA

: Programthe PLL (FM/QPSKcarrier recovery) loop filter proportionalcoefficientA:

Acoefficient = coarse+ (sign x fine)

COARSE Value

00 0
01 1
10 1/2
11 1/4

SIGN

0+
1-

FINE Value

000 0
001 1/2
010 1/4
011 1/8
100 1/16
101 1/32
110 1/64
111 Not used

26/31

STV8203

PROGRAMMING THE DEVICE (continued)

BCOEFF2 - BCOEFF1

Address : 2E-3C
Type : R/W
Reset : 1010 1100for BCOEFF2 - 00010010 for BCOEFF1

bit 7 bit 6 bit 5 bit4 bit 3 bit 2 bit 1 bit 0

SAT SW2 or1 0 DCO 2 or 1 GAIN B2 or B1

SAT SW : Saturation Switch : 0 =FM, 1 = QPSK
DCOGAIN : Programme the gain coefficient(K0) :

B : Programme the PLL (FM/QPSK carrier recovery)loop filter integral coefficient B :

(PLLLoop Filter IntegralCoefficient and DCOGain)

DCO [5:3] Value

000 0
001 1
010 1/2
011 1/4
100 1/8
101 1/16
110 1/32
111 Not used

B [2:0] Value

000 0
001 1/4
010 1/8
011 1/16
100 1/32
101 1/64
11X Not used

27/31

STV8203

PROGRAMMING THE DEVICE (continued)

SCOEFF

Address : 2F
Type : R/W
Reset : 0001 1100

DMX-OF 0 PLF_A PLF_B

DMX-OF : Symbol trackingcontrol : 0 = QPSK,1 = FM.

PLF_A : A coefficient(proportional)

(Symbol Tracking Loop Filter Coefficients)

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

In QPSK mode, thesymbol trackingloop isclosed.

Programmethe symboltracking loop filterproportional coefficientA :

PLF_A [5:3] Value

000 0
001 1
010 2
011 4
100 8
101 16
110 32
111 Not used

PLF_B : B coefficient(integral)

Programthe symbol tracking loop filter integral coefficient B :

PLF_B [2:0] Value

000 0
001 1/16
010 1/32
011 1/64
100 1/128
101 1/256
110 1/512
111 1/1024

SRF (Symbol TrackingLoop Frequency)

Address : 30
Type : R/W
Reset : 0000 0000

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

SYMBOL RECOVERY FREQUENCY

This register provides access to the control signalfor the symbol trackingloop (2’s complement).If read,
it indicates a value proportional to the symbol tracking frequency error. If written to, it will preset the
frequencyerror.

SRF [7:0] Approx. Error (kHz)

10000000 -8
00000000 0
01111111 +8

RESET
After a reset sequence, all the registers controllable by AUTOSTANDARD function (FIR, COFQ, FIFQ,
ACOEFF, BCOEFF, SCOEFF, SRF) areadjusted for the standardI configuration(channel 1 to FM mono
modeand channel 2 to QPSK mode).

28/31

APPLICATIONDIAGRAM (SDIP42 PACKAGE)

SIF1

SIF2

100pF

560Ω

100pF

C1

10µF

L1
10µH

C2
10nF

C3 10nF

C4 10nF

C5 10nF

2

3

4

STV8203

CAP5

SIF1

CAP6

SIF2

U1

GND2

DV

REG

CAP3

DD5

STV8203

421

41

40

39

Q1
BC557B

C26

220nF

C4

10nF

L2
10µH

3

GND3

NC

C28 10µF

MONOOUT

6

MOUT

SCL

C7 1µF

MONO IN

MIN

7

SDA

C8 220nF

NOT USEDCAP8

C9 1µF

LIL1 IN

LIL1

9

XIN

C11 1µF

LIR1 IN

10

LIR1

GND4

11

XOUT

GND1

C13 1µF

LIL2 IN

12

LIL2

NC

C14 1µF

LIR2 IN

LIR2

NC

13

C27 10pF

14

CAP2

NC

C15 10µF

15

CAP1

NC

C16 10µF

AOL1

16

AOL1

NC

C17 10µF

AOR1

AOR1

NC

17

C18 1nF

18

CAP4

NC

C19 10µF

AOL2

AOL2

NC

19

C20 10µF

AOR2

20

AOR2

RESET

R2 39Ω (*)

8V

C23

10µF

C24
220nF

21

AV

CC

CAP7

(*) Note : Resistor R2 should beshort-circuited in caseof 5V onlysupply voltage application.

38

37

36

358

2

SCL

3

SDA

5V

39k

C10

Ω

22pF

34

R3

22kΩ

33

32

31

30

29

28

27

26

25

R1

24

220kΩ

23

XTAL
(24.712MHzto 27MHz

C12
22pF

C21 100nF

5V

C22

22

10µF

C25
10µF

8203-14.EPS

29/31

STV8203

PACKAGEMECHANICALDATA

42 PINS - PLASTICSHRINK DIP

A2

A1

LA

E

E1

42

1

Dimensions

BeB1

D

22

21

c

SDIP42

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

e1
e2

E

Gage Plane

e3
e2

A 5.08 0.200
A1 0.51 0.020
A2 3.05 3.81 4.57 0.120 0.150 0.180

B 0.36 0.46 0.56 0.0142 0.0181 0.0220
B1 0.76 1.02 1.14 0.030 0.040 0.045

c 0.23 0.25 0.38 0.0090 0.0098 0.0150
D 37.85 38.10 38.35 1.490 1.5 1.510
E 15.24 16.00 0.60 0.629

E1 12.70 13.72 14.48 0.50 0.540 0.570

e 1.778 0.070

e1 15.24 0.60
e2 18.54 0.730
e3 1.52 0.060

L 2.54 3.30 3.56 0.10 0.130 0.140

.015
0,38

PMSDIP42.EPS

SDIP42.TBL

30/31

PACKAGEMECHANICALDATA

44 PINS - FULL PLASTICQUAD FLAT PACK(TQFP) (THIN)

44 34

1

e

33

E3

E1

0,10 mm
.004 inch

SEATING PLANE

E

STV8203

A

A2

A1

B

Dimensions

11

12 22

D3
D1

D

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

23

c

L1

L

0,25 mm
.010 inch

K

GAGE PLANE

A 1.60 0.063

A1 0.05 0.15 0.002 0.006
A2 1.35 1.40 1.45 0.053 0.055 0.057

B 0.30 0.37 0.40 0.012 0.015 0.016
C 0.09 0.20 0.004 0.008
D 12.00 0.472

D1 10.00 0.394
D3 8.00 0.315

e 0.80 0.031
E 12.00 0.472

E1 10.00 0.394
E3 8.00 0.315

L 0.45 0.60 0.75 0.018 0.024 0.030

L1 1.00 0.039

K0

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No licence is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
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without express written approval of STMicroelectronics.

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The ST logo is a registered trademark of STMicroelectronics

 1999 STMicroelectronics - All Rights Reserved

2

C Components of STMicroelectronics, conveys a licenseunder the Philips I2C Patent.

2

C Standard Specifications as defined byPhilips.

the I

STMicroelectronics GROUP OF COMPANIES

2

C system, is granted provided that the system conforms to

http://www.st.com

o

(Min.), 7o(Max.)

31/31

PM-4Y.EPS

4Y.TBL