MULTISTANDARD SOUND DEMODULATOR PERFORMS MONO, CARRIERS NICAM REC

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MULTISTANDARD SOUND DEMODULATOR PERFORMS MONO, CARRIERS NICAM REC

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STV8203
MULTISTANDARD SOUND DEMODULATOR
PERFORMS MONO, CARRIERS NICAM RECEPTION B/D/G/H/I/K/K1/K2/L/L' 500kHz DEVIATION DEMODULATOR POST-PROCESSING INTEGRATED FILTERS, ALIGNMENT FREE STANDARD RECOGNITION FLAG SINGLE QUARTZ CRYSTAL CONTROLLED DOUBLE SCART AUDIO MATRIX STAND-BY WITH THRU MODE SINGLE DACS EASY IMPLEMENTATION AUTOSTANDARD MODE ADVANCED OPERATING MODE FULL CUSTOMIZATION WITH WIDE RANGE
SHRINK42 (Plastic Package) ORDER CODE STV8203
DESCRIPTION STV8203 provides necessary circuitry demodulation Nicam German stereo audio transmission. very suitable applications well VCR, Personal Computer applications. Different transmission standards automatically detected demodulated without user intervention. recovered audio signals made available analog form. More, STV8203 integrates audio matrix with THRU mode when stand-by. Very flexible applications possible thanks smart program modes large choice appropriate audio processing ICs.
January 1999
This advance information product development undergoing evaluation. Details subject change without notice.
TQFP44 1.4mm) (Full Plastic Quad Flat Pack) ORDER CODE STV8203D
1/31
STV8203
SDIP42 CONNECTIONS
CAP5 SIF1 CAP6 SIF2 GND3 MOUT CAP8 LIL1 LIR1 GND4 LIL2 LIR2 CAP2 CAP1 AOL1 AOR1 CAP4 AOL2 AOR2 AVCC GND2 DVDD5 CAP3 USED XOUT GND1
8203-01.EPS
RESET CAP7
TQFP44 CONNECTIONS
GND3 GND2 CAP6 CAP5 SIF2 SIF1 CAP3 DVDD5
MOUT CAP8 LIL1 LIR1 GND4 LIL2 LIR2 CAP2 CAP1 AOL1
USED XOUT GND1
2/31
8203-02.EPS
AOR1
AOL2
AOR2
RESET
CAP4
CAP7
AVCC
STV8203
LIST
Number SDIP42 TQFP44 Name CAP5 SIF1 CAP6 SIF2 GND3 MOUT CAP8 LIL1 LIR1 GND4 LIL2 LIR2 CAP2 CAP1 AOL1 AOR1 CAP4 AOL2 AOR2 AVCC CAP7 RESET GND1 XOUT used CAP3 DVDD5 GND2 Type Analog Analog Analog Analog Power Analog Analog Analog Analog Analog Power Analog Analog Analog Analog Analog Analog Analog Analog Analog Power Analog Input Power Analog Analog Input Bi-directional Input Analog Analog Power Power Function Decoupling Supply Regulator Output Subcarrier Input Decoupling Input Amplifier Reference Subcarrier Input Ground Input Amplifier Mono Audio Output Mono Audio Input Vtop Decoupling Line Left Input (SCART Line Right Input (SCART Audio Ground Line Left Input (SCART Line Right Input (SCART Decoupling Audio Matrix Decoupling Bandgap Reference Line Left Output (SCART Line Right Output (SCART Audio Matrix (5V) Line Left Output (SCART Line Right Output (SCART Connected Audio Matrix Supply Decoupling Digital Regulator Output Power Reset Connected Connected Connected Connected Connected Connected Connected Connected Digital Ground Crystal Oscillator Output Crystal Oscillator Input connected ground Serial Data Serial Clock Connected Connected Decoupling Digital (regulator output) Base Drive External Regulator Transistor Supply Digital Ground
3/31
8203-01.TBL
STV8203
BLOCK DIAGRAM
INTERFACE NICAM DEMODULATOR CORE
SIF1 SIF2
ANALOG SWITCH
XTAL
CRYSTAL OSCILLATOR
AUDIO MATRIX R1)/2 2VRMS 2VRMS SCART1 SCART1 SCART2 SCART2 1VRMS MONO
DVDD5 AVCC
POWER SUPPLY REGULATORS
Digital Analog PRE-SCALING
STV8203
SCART1 SCART2 SCART1 SCART2 MONO
Demodulator Core Block Diagram
DEMODULATOR CORE BLOCK DIAGRAM
SIGNAL SHAPING
PRE-SCALING
BAND PASS
NOISE ESTIMATION
LEVEL ESTIMATOR
SOUND STANDARD MANAGEMENT IDENTIFICATION, CHANNEL CONTROL, MUTE,
DIGITAL CHANNEL MATRIX AUTOSWITCH
DISCRIMINATOR
SIGMA DELTA
Channel
PILOT RECOGNITION
NOISE ESTIMATION
PRE-SCALING
SIGNAL SHAPING
BAND PASS
DISCRIMINATOR
SIGMA DELTA
Channel
Data also available throught
4/31
8203-04.EPS
NICAM QPSK DECODER
QPSK LOCK DETECTION
ERROR RATE
8203-03.EPS
STV8203
FUNCTIONAL DESCRIPTION seen from block diagram, input demodulator section selectable from I.F. sources bus. selected signal then passed through block, having range 28dB, before being digitised unit. single quartz crystal (suggested value between 24.712MHz 27MHz) used digital processing, including demodulation, identification, control, filtering. This advantage single clock signal source whole which eliminates problems multiple clock. single clock chosen minimize interference stages tuner system. demodulator system identify demodulate standard described Table result recognition flagged host system communication system. case NICAM transmissions, event failure received signal degradation error rate (BER) below prescribed level, system will automatically default reserve sound transmission mono demodulation, discriminator normally handle signals having 250kHz deviation. This covers European standards, ensure optimized compromise signal noise ratio hand, over modulation other hand. However, possible extand deviation range 500kHz (I2C programmable) order cover requests some broadcasters. Fully automatic standard recognition setting achieve using simple routines. Figure Audio Matrix
LI2(SCART2) GAIN LI1(SCART1) MUTE L2/R2 MUTE MUTE L1/R1 R1)/2 SELECTOR AO1(SCART1)
Appropriate de-emphasis networks digital domain applied resulting demodulated signals (50µs, J17), followed dematrixing required. digital datastream then passed through 16bits DACs before audio matrix. this first section working 3.3V thanks integrated voltage regulator. stand-by mode, voltage regulator pulls voltage down zero, ensuring power dissipation this part. audio matrix allows selection inputs applied outputs SCART1, SCART2 MONO according diagram shown Figure "MOUT" outputs either signal (L1+R1)/2. This allows record selected channel mono mode, example linear channel simultanously with stereo mode. Maximum output swing 1VRMS. audio matrix section power supply regulator, allowing keep this part working even when rest stand-by mode. This achieves "THRU" mode from input "SCART1" output "SCART2" input "SCART2" output "SCART1". maximum output swing both SCART1 SCART2 2VRMS. Remark Circuit operation possible with only single supply. this case, AVCC supply connected Maximum output swing then limited 1VRMS attenuation automatically added output. that case, resistor shown Application Diagram (between must replace short circuit avoid clipping.
MOUT
8203-05.EPS
AO2(SCART2)
5/31
STV8203
FUNCTIONAL DESCRIPTION (continued) Table Demodulated Sound Norms
System Sound Type mono D/K1 D/K2 FM/NICAM carriers FM/NICAM mono FM/NICAM carriers carriers FM/NICAM mono NICAM mono Type Carrier Carrier Deviation (kHz) Name (kHz) (kHz) Nom. Max. Over 5.850 5.850 6.258 6.742 6.552 50µs 50µs 50µs 54.6875 54.6875 5.850 5.742 5.850 50µs 54.6875 Deemphasis Roll-off Pilot Frequency (kHz)
Notes STV8203 performs only limited demodulation. Report Application Note. 50µs only, instead 75µs.
6/31
STV8203
USING STV8203 Hardware Power Supplies (see Figure using main power supplies DVDD5 supplies digital part VNom. This power supply switched-off standby mode. AVCC supplies audio matrix part VNom. then output voltage swing output pins reach 2VRMS, VNom. then output voltage swing output pins reach 1VRMS. Figure
DVDD5 AVCC
between stereo mono signals playback mode case marginal noise conditions. Stand-by Stand-by with THRU mode analog part device power supply (AVCC) allowing this part keep working even when digital part, powered power supply (DVDD5), stand-by. this case, audio matrix special setting LIL1 AOL2, LIR1 AOR2, LIL2 AOL1, LIR2 AOR1, input gain 0dB. This allows achieve "THRU" mode from SCART1 input SCART2 output SCART2 input SCART1 output, providing copy facility from SCARTIN SCARTOUT. Software modes operation available
DEMODULATION CONTROL PART Pins 5-32-42
AUDIO MATRIX
8203-06.EPS
Sound Subcarrier Filters Sound demodulation decoding very easy with this device providing necessary functions that purpose, including channel filters. These base-band filters give best selectivity desired channel provides NICAM mode correct cosine roll-off response. This implies that external filters required (except simple high-pass filter, filters sound demodulators used application create picture interferences). filters automatically B/G/H/I/L/L' standards. They also easily tuned through Audio Matrix mono output (MOUT) output (L1+R1)/2 signal. typical application possibility record selected channel mono mode linear track separately from recording stereo signal, providing facility select
Optimized Program Mode Four standards have default setting stored order allow very easy programmation. Only some registers have programmed (these registers shown bold Figure most cases, reset values will sufficient. Figure STAT represent registers which controlled "standard processor". These registers located between address 23Hex 3CHex complete list registers. Advanced Operation Mode that mode, read/write registers mentionned complete list) programmed manually changed from their reset values. additionnal registers accessible this mode shown bold Figure This mode selected putting bits [3:0] AO-CONTROL register
7/31
STV8203
USING STV8203 (continued) Figure Optimized Program Mode
INPUT SWITCH CHANNEL FILTER FIR1 DEMODULATOR STAT AUDIO MATRIX
PRE-LINE-IN
LEVEL DETECTOR COARSE FINE
CETH1 SQTH1 STAT
PRE-LINE-IN AUD-MX-CNT
AGCC AGCS AO-STAT0 AO-STAT1 AO-STAT2
ZWEITON
ZWEITON DETECTOR
PRESCALE
STAT
AUTO STANDARD
CHANNEL FILTER FIR2
PRE-FM INPUT CETH2 SQTH2 DEMODULATOR FM/QPSK STAT
SWITCH DE-MATRIX DE-EMPHASIS
DAC's
AO-CONTROL AO-TIMEOUT COARSE FINE
NICON CLOCK CONTROL
NICAM DECODER
NICAM PRESCALE
STAT
PRE-NICAM
Figure Advanced Operation Mode
STAT(2) INPUT SWITCH CHANNEL FILTER FIR1
DEMODULATOR
CRF1
AUDIO MATRIX
PRE-LINE-IN
LEVEL DETECTOR COARSE
FIR1CO-7 FINE ZWEITON COFQ1 FIFQ1 IAGCR IAGCC
CETH1 SQTH1 ACOEFF1 BCOEFF1 STAT(2) FMDC1/2 ZWEITON DETECTOR STAT(2) PRE-FM INPUT DEMODULATOR FM/QPSK CRF2 STAT(3) IAGCS
PRE-LINE-IN AUD-MX-CNT
AGCC AGCS AO-STAT0 AO-STAT1 AO-STAT2
STAT(1)
PRESCALE SWITCH DE-MATRIX DE-EMPHASIS
STAT (1),
AUTO STANDARD
CHANNEL FILTER FIR2
DAC's
AO-CONTROL AO-TIMEOUT FFFIXL FFFIXH FCFIX FIR2CO-7 CLOCK CONTROL COARSE FINE CETH2 SQTH2 ACOEFF2 BCOEFF2 SCOEFF NICAM DECODER
NICAM PRESCALE
Bits AO-STAT0 Bits AO-STAT1 Bits AO-STAT2
COFQ2
FIFQ2
8/31
8203-08.EPS
NICON
ERRCOUNT
PRE-NICAM
STD-CT-IIS
8203-07.EPS
STV8203
USING STV8203 (continued) Example Applications
Very Cost Application
Figure
Control
TUNER I.F.
MULTISTANDARD SOUND PROCESSOR STV8203
AUDIO AMPLIFIER TDA7495
DEMODULATOR
8203-09.EPS
SCART1
SCART2
High-End Application
Figure
Control
TUNER I.F. TUNER I.F.
MULTISTANDARD SOUND PROCESSOR STV8203 AUDIO PROCESSOR SURROUND/KARAOKE TDA7466
DEMODULATOR
Application
Figure
Control
TUNER I.F. TUNER I.F.
MULTISTANDARD SOUND PROCESSOR STV8203
AUDIO AMPLIFIER TDA7495
DEMODULATOR
Analog Audio
9/31
8203-11.EPS
8203-10.EPS
SCART1
SCART2
STV8203
ABSOLUTE MAXIMUM RATINGS
Symbol AVDD5 DVDD5 AVCC Ptot Toper Tstg Analog Supply Voltage Digital Supply Voltage Scart Interface Supply Voltage Power Total Dissipation Operating Temperature Storage Temperature Parameter Value -20, +150 Unit
THERMAL DATA
Symbol (j-p) Parameter Junction Pins Thermal Resistance Max. SDIP42 TQFP44 Value Unit °C/W °C/W
8203-03.TBL 8203-05.TBL 8203-04.TBL
RECOMMENDED OPERATING CONDITIONS
Symbol AVDD5 DVDD5 AVCC Analog Digital Audio Interface Supply 2VRMS outputs 1VRMS outputs Parameter Min. 4.75 4.75 4.75 Typ. Max. 5.25 5.25 5.25 Unit
ELECTRICAL CHARACTERISTICS (Tamb 25oC, unless otherwise specified)
Symbol GENERAL IAIN IDIN INPUTS SWISO (Min.) (Max.) Input Resistance Input Capacitance Switch Isolation Input Frequency Range Minimum Input Level Maximum Input Level Range 10MHz demodulation mVRMS mVRMS Input Current AVCC AVCC AVCC DVDD5 Parameter Test Conditions Min. Typ. Max. Unit
10/31
8203-02.TBL
STV8203
ELECTRICAL CHARACTERISTICS (Tamb 25oC, unless otherwise specified) (continued)
Symbol Parameter Test Conditions Min. Typ. Max. Unit DEMODULATION PATH (see Figure fRESP VFMOUT Frequency Response Signal Noise Total Harmonic Distortion German Stereo Channel Separation Rejection Maximum Output Swing 100mVRMS modulation 1kHz 20Hz 15kHz 100mVRMS, unweighted 20Hz-15kHz, Output 2VRMS 1kHz Output signal 1VRMS 1kHz, 50kHz deviation -1.0 +1.0 VRMS
NICAM DEMODULATION PATH (see Figure Signal Noise Total Harmonic Distortion VNICOUT Maximum Output Swing Channel Separation AUDIO MATRIX (see Figure GMAT ROUT Output Resistance Signal Noise Ratio Audio Channel Crosstalk Audio Crosstalk from Channel Channel 2VRMS 1kHz Input Resistance Input Clipping Level AVCC AVCC Prescaling 1VRMS, 15Hz 15kHz audio output except Mono output Mono output Preline VOUT 2VRMS, unweighted 20Hz-15kHz -0.5 VRMS VRMS
8203-06.TBL 8203-13.EPS 8203-12.EPS
100mVRMS, unweighted 20Hz-15kHz, Output 2VRMS 1kHz Output signal 1VRMS 1kHz
0.07
VRMS
Figure Synoptic
Analog Switch SIF1 DIGITAL DEMODULATATION AOL1 AOR1
STV8203
Figure Synoptic
STV8203
AIL1 AIR1
Analog Switch AOL1 AOR1
11/31
STV8203
PROGRAMMING DEVICE Address Protocol
Write
SUB-ADDRESS DATA DATA
Read
SUB-ADDRESS DATA DATA
Start, Acknowledge, Stop, acknowledge. Sub-address register address pointer this value auto-increments both write read. List Registers
Registers controlled AUTOSTANDARD, except bits marked which controlled
Name Addr. (Hex) Reset (Bin) 0001 1101 0001 1101 0001 1000 read only read only 0000 1000 0010 0010 0000 0000 read only read only read only read only 0001 1111 1010 0101 1000 1000 Register Function /Description gain
(Switch, Dematrix De-emphasis) PRE-FM PRE-NICAM STD-CT-IIS FMDC1 FMDC2 AUDIO MATRIX PRE-LINE-IN AUD-MX-CNT NICAM NICON ERR-COUNT AUTOSTANDARD AO-STAT0 AO-STAT1 AO-STAT2 AO-CONTROL AO-TIMEOUT ZWEITON ZWEITON DEMODULATOR AGCC 0001 0001 agc-cmd* agc-ref [2:0] agc-cst[1:0] AGCS 0100 00xx agc-err [4:0] sig-ovr sig-und IAGCR 1000 1000 Iagc-ref [7:0] IAGCC 0000 0011 iagc-off* Iagc-cst[2:0] IAGCS read only Iagc-Ctrl [7:0] FFFIXL 0000 0000 Clock Generator Fine Frequency lsb's) FFFIXH 0110 1110 demod mode M2:M0* clock fine freq msb's) FCFIX 0001 0001 Clock Generator Coarse Frequency CRF2 0000 0000 Channel Carrier Recovery Frequency CETH2 0011 0101 Channel carrier-th [7:0] SQTH2 0011 1100 Channel squelch-th [7:0] Range Registers Controlled AUTOSTANDARD Function (address Hex) CRF1 0000 0000 Channel Carrier Recovery Frequency CETH1 0011 0101 Channel carrier-th [7:0] SQTH1 0011 1100 Channel squelch-th [7:0] 12/31 Thresh-Sig [3:0] Thresh-ST [3:0] std-det sid1 sid0 aomute fm2-car fm2-sq fm1-car fm1-sq nic-det f-mute mute mono unmute Time setting (1280ms) am-mono [2:0] (monitor) qpsk-lk zw-det zw-st zw-dm Nicam [4:1] n-mute standard check [3:0] Time setting (160ms) dif-pol TSCTRL [1:0] error [7:0] Switch mout1 Switch select mout0 Line Inputs Gain [3:0] select Prescale [4:0] Nicam Prescale [4:0] demoff mute [2:0] level level
STV8203
PROGRAMMING DEVICE (continued)
Registers controllable AUTOSTANDARD
Name Addr. (Hex) Reset (Bin) Register Function/Description
DEMODULATOR CHANNEL FIR2CO FIR2C1 FIR2C2 FIR2C3 FIR2C4 FIR2C5 FIR2C6 FIR2C7 COFQ2 FIFQ2 ACOEFF2 BCOEFF2 SCOEFF 0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 0000 0100 0001 0100 0010 0101 0000 1100 1100 0100 1001 0000 1010 1100 0001 1100 0000 0000 dmx-of FIR2 coefficient FIR2 coefficient FIR2 coefficient FIR2 coefficient FIR2 coefficient FIR2 coefficient FIR2 coefficient FIR2 coefficient Channel Coarse Frequency Channel Fine Frequency (8lsb's) Coarse dco2 gain plf_A Symbol Recovery Frequency Sign Fine plf_B
DEMODULATOR CHANNEL FIR1CO FIR1C1 FIR1C2 FIR1C3 FIR1C4 FIR1C5 FIR1C6 FIR1C7 COFQ1 FIFQ1 ACOEFF1 BCOEFF1 0000 0000 1111 1110 1111 1100 1111 1101 0000 0010 0000 1101 0001 1000 0001 1111 0000 1011 1100 0111 0010 0011 0001 0010 sat-sw1 FIR1 coefficient FIR1 coefficient FIR1 coefficient FIR1 coefficient FIR1 coefficient FIR1 coefficient FIR1 coefficient FIR1 coefficient Channel Coarse Frequency Channel Fine Frequency (8lsb's) Coarse dco1 gain Sign Fine
Note This register must kept "0".
RESERVED 00000000
13/31
STV8203
PROGRAMMING DEVICE (continued) Register Description Registers Controlled Autostandard (except some mentioned bits)
PRE-FM (Prescale Level) Address Type Reset 0001 1101
PRESCALE
PRESCALE 00000 01100 +12dB 10100 -12dB (step size 1dB, range ±12dB complement) Sets reference level signal. Note, this also dependant programming. example, with default settings PLL, deviation 27kHz will result signal 17dB below full scale before de-emphasis. 1kHz, internal de-emphasis gain 14dB giving level -3dB. Full scale output from 2VRMS corresponding 0dB. 1VRMS, PRE-FM should -3dB.
PRE-NICAM (Prescale NICAM Level) Address Type Reset 0001 1101
NICAM PRESCALE
NICAM PRESCALE 00000 01100 +12dB 10100 -12dB (step size 1dB, range ±12dB complement) Sets reference level NICAM signal. example, full scale NICAM signal 1kHz would received -12dB before de-emphasis. Internal de-emphasis gain this frequency 1VRMS, pre-nicam should -3dB.
14/31
STV8203
PROGRAMMING DEVICE (continued)
STD-CT-IIS (SWD Control) Address Type Reset 0001 1000
GAIN DEMOFF MUTE
GAIN
DEMOFF MUTE
which should normally default value, used change dematrix gain L+R. dematrix gain channel L/2+R/2, channel bypasses Nicam de-emphasis de-emphasis mutes Nicam) muted (only effective AUTOSTANDARD function off) Bits allow control mode switch/dematrix function shown below. (only effective AUTOSTANDARD function off)
[2:0] De-emphasis Description mono Zweiton mono Zweiton dual mono NICON[1:0] used Left Right
50µs
Zweiton stereo Nicam mono Nicam dual mono
Nicam stereo
audio from CH1, audio from CH2, dematrixed Zweiton stereo. Nicam Nicam Nicam stereo. These bits controlled AUTOSTANDARD when this function activated.
FMDC1, FMDC2 Level) Address 05-06 Type
LEVEL LEVEL
Frequency offset (dependent coefficients). This value (2's complement) proportional offset, measured below 20Hz, signal. could used implement signals.
15/31
STV8203
PROGRAMMING DEVICE (continued)
PRE-LINE-IN Input Selection Audio Matrix Gain Control) Address Type Reset 0000 1000
SWITCH SWITCH LINE INPUTS GAIN
SWITCH
Input Switch controls input selection IF1). SWITCH used switch-off amplifier. LINE INPUTS GAIN allow levels analog line inputs (SCART1, SCART2 MONO) adjusted simultaneously. 1000 (default setting) 0010 -6dB 1110 +6dB (step size 1dB, range ±6dB)
AUD-MX-CNT (Audio Matrix Control) Address Type Reset 0010 0010
MOUT1 SELECT MOUT0 SELECT
These bits used control audio matrix configuration (see Figure
Data bits Actual Function Selected Reset MOUT (L1+R1)/2 Muted Muted (reset state) (Scart input) Muted Muted Muted Muted Muted (reset state) Muted (Scart input) Muted Muted Muted MOUT (L1+R1)/2 (reset state) MOUT MOUT used
16/31
STV8203
PROGRAMMING DEVICE (continued)
NICON (NICAM Control) Address Type Reset 0000 0000
DIF-POL TSCTRL
DIF-POL TSCTRL
controls polarity channel DQPSK decoder. default value correct Nicam B/G/L does need changed. These bits programmed chose decision mode zweiton detector following decisions with 1024 samples accumulation decisions with 1024 samples accumulation decisions with 2048 samples accumulation decisions with 2048 samples accumulation error rate counting time 128ms, 64ms allowed errors 511, Bits adjust error rate (approximate) which Nicam decoder mutes; fixed hysteresis provided that decoder will unmute only when dropped quarter that muting
Muting Threshold
ERR-COUNT (Nicam Error Counter) Address Type
ERROR
Error Signals Count (averaged over time above) value this register, updated every 64ms 128ms, gives indication Nicam error rate. therefore used mute decoder error rate below (=FF ECT= 64ms).
17/31
STV8203
PROGRAMMING DEVICE (continued)
AO-STAT0 (AUTOSTANDARD Status Address Type
STD-DET SID1 SID0 AOMUTE AM-MONO (MONITOR)
STD-DET
Standard Detection standard detected indicates that expected standard been identified. Standard Identification demodulator input indicate standard which been identified
SID[1:0] Standard FM/NICAM Zweiton FM/NICAM L/L' AM/NICAM
[1:0]
AOMUTE
AM-MONO
Audio Output Mute indicates that audio outputs muted (=1); only when demodulator selected audio source. This would case during standard search signal found. selected indicates input (MIN) been selected (=1); normally used system Switch Dematrix Mode indicate setting block
SWD[2:0] Mode description mono Zweiton mono (CH1) Zweiton dual mono Zweiton stereo Unused NICAM mono NICAM dual mono NICAM stereo De-emphasis 50µs
Unused J-17
AO-STAT1 (AUTOSTANDARD Status demodulator signal detectors) Address Type
FM2-CAR FM2-SQ FM1-CAR FM1-SQ QPSK-LK ZW-DET ZW-ST ZW-DM
FM2-CAR Carrier Detector Lock FM2-SQ Squelch Detector Lock FM1-CAR Carrier Detector Lock FM1-SQ Squelch Detector Lock QPSK-LK QPSK Lock ZW-DET Zweiton Pilot Lock ZW-ST Zweiton Stereo Lock ZW-DM Zweiton Dual Mono Lock This register allows direct access demodulator signal detectors detected.
18/31
STV8203
PROGRAMMING DEVICE (continued)
AO-STAT2 (AUTOSTANDARD Status NICAM) Address Type
NIC-DET F-MUTE N-MUTE NICAM
NIC-DET F-MUTE
NICAM
NICAM detected indicates valid NICAM signal found detected). Frame Mute indicates NICAM decoder muted because superframe alignment been lost. Loss frame Alignment word indicates loss alignment frame alignment word NICAM decoder; error rate high signal present. indicates received NICAM control bits with following interpretation
CBI[4:1] X000 X001 X010 X011 X1XX 0XXX 1XXX Nicam Signal Description Stereo mono, data Dual Mono 704Kbit/s data selected during additional coding options Nicam different mono Nicam mono(M1) stereo mono
N-MUTE
NICAM Mute indicates that NICAM decoder muted unmuted AO-CONTROL
19/31
STV8203
PROGRAMMING DEVICE (continued)
AO-CONTROL (AUTOSTANDARD Control) Address Type Reset 0001 1111
MUTE MONO UNMUTE STANDARD CHECK
AUTOSTANDARD controls audio matrix when user selected source (AUD-MXCNT bits[6:4] 010). this case will mute outputs select MIN. These functions overriden bits below. MUTE Mute override, mute (override AUTOSTANDARD) forces audio signal muted. MONO FM/AM Mono override, mono (override AUTOSTANDARD) forces used force analogue sound. This useful case marginal NICAM reception prevent automatic switching.
AUD-MX-CNT bits[6:4] source case L/L' standard) case standard) Muted case standard) Muted
UNMUTE
Nicam Un-mute, unmute allows NICAM decoder unmuted error rate higher than preset limit; this overrides automatic switching which would normally occur. CBI4 override, CBI[4] forced internally used override NICAM control (reserve sound switch) required. This transmitted broadcaster indicate that analogue sound carrier backup NICAM signal; this usually case. NICAM signal fails, STV8203 will automatically switch backup sound received this decoder will stay switched analogue sound. received CBI4 ignored. Note that automatic standard off, switching between analogue NICAM audio must done manually. STANDARD Control choice transmission standards searched automatic standard function CHECK (standard search active when more choices, longer search time. system identified characteristics video signal, example chroma demodulator, then only single needs set. this case, AUTOSTANDARD function will program demodulator chosen standard. bits set, AUTOSTANDARD function disabled registers need manually. check standard (L/L' AM/NICAM) Check Standard (B/G FM/NICAM) check standard (B/G Stereo) check standard FM/NICAM)
AO-TIMEOUT (AUTOSTANDARD Timer Adjustment) Address Type Reset 1010 0101
TIME SETTING TIME SETTING
Time used NICAM mono validation time Zweiton. standard found within this time limit, next standard will tried. Time decimal [bit 3:0] 32ms. Time decimal [bit 7:4] 128ms. Time default value 160ms. Time default value 1280ms. time should programmed.
20/31
STV8203
PROGRAMMING DEVICE (continued)
ZWEITON (Pilot Carrier Tone Detector Thresholds) Address Type Reset 1000 1000
THRESH-SIG THRESH-ST
THRESH-SIG Pilot Carrier Level Threshold sensitivity pilot carrier detector. THRESH-ST Detected Tone Level Threshold detection threshold level stereo dual mono (bi-lingual) tones. Power default values give detection threshold corresponding modulated pilot carrier (700Hz 40dB recovered audio.
AGCC (AGC Control ADC) Address Type Reset 0001 0001
AGC-CMD AGC-REF AGC-CST
AGC-CMD manual/forced mode, automatic mode Normally enabling automatic mode. case system L/L', presence sound carrier, should switched off. this case, fixed gain value should using AGCS register (see below). This controlled AUTOSTANDARD when this function activated. AGC-REF Defines clipping level. Adjust allowable proportion samples input which will clipped; tries maximise full scale range ADC. default setting gives ratio 1/256.
AGC-REF [4:2] Clipping Ratio 1/16 (single carrier) 1/32 1/64 1/128 1/256 1/512 1/1024 1/2048 (multiple carriers)
AGC-CST time constant between each step 1.25dB. 27MHz XTAL 1.21ms, 2.43ms, 4.85ms, 9.7ms. adjustment compromise between settling time noise immunity.
21/31
STV8203
PROGRAMMING DEVICE (continued)
AGCS (AGC Control Status ADC) Address Type Reset 0100 00XX
AGC-ERR SIG-OVR SIG-UND
AGC-ERR Gain Control Signal amplifier before ADC. There steps 1.25dB.
AGC-ERR [6:2] 00000 00001 11110 11111 Gain (dB) 1.25 37.50 38.75
SIG-OVR SIG-UND
When AGC_CMD AGC-ERR read thus indicating input level. also written thus presetting level which will then adjust itself final value. When AGC_CMD thus writing AGC-ERR directly controls amplifier gain. Reading AGC_ERR just confirms fixed value. overloaded signal under loaded signal SMALL When automatic mode (agc_cmd=0), indicates input signal small big. These bits could used when setting input level STV8203.
IAGCR (Internal Reference QPSK) Address Type Reset 1000 1000
IAGC-REF
Sets mean value internal AGC, used QPSK demodulation. default setting corresponds half full scale amplitude input.
IAGCC (Internal Time Constant QPSK) Address Type Reset 0000 0011
IAGC-OFF IAGC-CST
IAGC-OFF Internal Only enabled when AUTOSTANDARD off. Normally internal should QPSK. This controlled AUTOSTANDARD when this function activated. IAGC-CST Internal Programmable Step Constant. internal time constant; compromise between fast settling time (for quickest Nicam identification) noise immunity. control range about 45dB divided into 0.2dB steps. These bits control time step (values given QPSK mode)
AGC-CST [2:0] 22/31 Step time (µs) Time Response (ms) 0.82
STV8203
PROGRAMMING DEVICE (continued)
IAGCS (Internal Control Value) Address Type
IAGC-CTRL
Indicates value internal control signal. Normally, mean value should equal value IAGCR register when signal being demodulated.
FFFIXL (Clock Generator Fine frequency) Address Type Reset 0000 0000
CLOCK GENERATOR FINE FREQUENCY LSB's)
FCFIX register explanation.
FFFIXH (Clock Generator Fine Frequency Control) Address Type Reset 0110 1110
DEMOD MODE M2:M0 CLOCK FINE FREQ MSB's)
DEMOD MODE M2:M0
Controls demodulator mode (only when register Ehex bits[3:0] 0000)
MODE[6:4] Normal Wide Normal Wide Normal Wide FM/QPSK Normal Wide QPSK System B/G/L QPSK System B/G/L QPSK System QPSK System
discriminator modulation full range narrow mode 250kHz 125kHz), wide mode 500kHz 250kHz). CLOCK FINE FREQ Clock generator fine frequency MSB's) FCFIX explanation).
FCFIX (Clock Generator Coarse Frequency) Address Type Reset 0001 0001
CLOCK GENERATOR COARSE FREQUENCY
bits [5:0] together with FFFIXH bits [3:0] FFFIXL bits [7:0] used programme internal clock generator different quartz crystal frequencies default value 27MHz. Fref with Fref crystal frequency, Fqpsk 728kHz 23.296MHz. Fqpsk FCFIX INT(P) (INT: integer part) FFFIX REM(P) (REM: fractional remainder) Note that FFFIX <3840 there small range frequencies which cannot used. Example Fref 27MHz, FCFIX FFFIX 3584.
23/31
STV8203
PROGRAMMING DEVICE (continued)
CRF2 CRF1 (FM/QPSK Demodulator Offset) Address 20-3D Type Reset 0000 0000
CHANNEL CHANNEL CARRIER RECOVERY FREQUENCY
This register provides access instantaneous frequency (2's complement). written will preset frequency; read provides instantaneous frequency offset PLL's could used function.
CETH2 CETH1 Carrier Level Threshold) Address 21-3E Type Reset 0011 0101
CHANNEL CHANNEL CARRIER-THRESHOLD
These registers, which perform same function channel channel compare carrier level channel against threshold value. This level measured after channel filter relative full scale reference level (0dB). This used part validation signal, carrier level below threshold, signal considered non-valid.
CETH Threshold (dB)
CETH OFF, carrier level will accepted. reset value means threshold -20dB.
SQTH2- SQTH1 Squelch Threshold) Address 22-3F Type Reset 0011 1100
CHANNEL CHANNEL SQUELCH-THRESHOLD
squelch detector measures level high frequency noise (>40kHz) compares threshold SQTH. level below this value, signal considered acceptable. Values given with ±50kHz deviation
SQTH (dB)
reset value means 15dB.
24/31
STV8203
PROGRAMMING DEVICE (continued) Registers Controllable Autostandard
FIR2C FIR1C (FIR Coefficients) Address 23-24-25-26-27-28-29-2A 31-32-33-34-35-36-37-38 Type
FIR2 FIR1 COEFFICIENT FIR2 FIR1 COEFFICIENT FIR2 FIR1 COEFFICIENT FIR2 FIR1 COEFFICIENT FIR2 FIR1 COEFFICIENT FIR2 FIR1 COEFFICIENT FIR2 FIR1 COEFFICIENT FIR2 FIR1 COEFFICIENT
Each demodulator channel implements symetric filter, each with coefficients. following table gives default values provided AUTOSTANDARD function 50kHz mode).
Number System FM/NICAM System Zweiton System FM/NICAM System L/L' AM/NICAM
COFQ2 COFQ1 (DCO Coarse Frequency) Address 2B-39 Type Reset 0000 1100 COFQ2 0000 1011 COFQ1
CHANNEL CHANEL COARSE FREQUENCY
FIFQ1/2 below explanation.
25/31
STV8203
PROGRAMMING DEVICE (continued)
FIFQ2 FIFQ1 (DCO Fine Frequency) Address 2C-3A Type Reset 1100 0100 FIFQ2 1100 0111 FIFQ1
CHANNEL CHANNEL FINE FREQUENCY (8LSB's)
DCO's, which carrier frequency demodulated, adjusted parts follows where carrier frequency, crystal frequency Take nearest integer, bits COFQ register Take nearest integer, bits FIFQ register. Common frequencies with 27MHz
(MHz) 5.74 5.85 6.552 decimal binary 001010 001010 001010 001011 001100 decimal binary 11011010 00100011 01000100 11000111 11000100
ACOEFF2 ACOEFF1 (PLL Loop Filter Proportional Coefficient) Address 2D-3B Type Reset 10010000 ACOEFF2 0010 0011 ACOEFF1
SIGN FINE COARSE
Mode switch QPSK COARSE Program (FM/QPSK carrier recovery) loop filter proportional coefficient SIGNA, FINE coefficient coarse (sign fine)
COARSE SIGN FINE 26/31 Value
Value 1/16 1/32 1/64 used
STV8203
PROGRAMMING DEVICE (continued)
BCOEFF2 BCOEFF1 (PLL Loop Filter Integral Coefficient Gain) Address 2E-3C Type Reset 1010 1100 BCOEFF2 0001 0010 BCOEFF1
GAIN
GAIN
Saturation Switch QPSK Programme gain coefficient (K0)
[5:3] Value 1/16 1/32 used
Programme (FM/QPSK carrier recovery) loop filter integral coefficient
[2:0] Value 1/16 1/32 1/64 used
27/31
STV8203
PROGRAMMING DEVICE (continued)
SCOEFF (Symbol Tracking Loop Filter Coefficients) Address Type Reset 0001 1100
DMX-OF PLF_A PLF_B
DMX-OF Symbol tracking control QPSK, QPSK mode, symbol tracking loop closed. PLF_A coefficient (proportional) Programme symbol tracking loop filter proportional coefficient
PLF_A [5:3] Value used
PLF_B
coefficient (integral) Program symbol tracking loop filter integral coefficient
PLF_B [2:0] Value 1/16 1/32 1/64 1/128 1/256 1/512 1/1024
(Symbol Tracking Loop Frequency) Address Type Reset 0000 0000
SYMBOL RECOVERY FREQUENCY
This register provides access control signal symbol tracking loop (2's complement). read, indicates value proportional symbol tracking frequency error. written will preset frequency error.
[7:0] 10000000 00000000 01111111 Approx. Error (kHz)
RESET After reset sequence, registers controllable AUTOSTANDARD function (FIR, COFQ, FIFQ, ACOEFF, BCOEFF, SCOEFF, SRF) adjusted standard configuration (channel mono mode channel QPSK mode).
28/31
STV8203
APPLICATION DIAGRAM (SDIP42 PACKAGE)
100pF SIF1 560W 100pF SIF2 MONO MONO 220nF LIL1 LIR1 LIR1 XOUT LIL1 22kW XTAL (24.712MHz 27MHz 22pF CAP8 USED 22pF 39kW MOUT 10nF 10nF SIF2 CAP3 CAP6 10nF 10nF SIF1 DVDD5 BC557B 220nF 10nF
STV8203
CAP5 GND2
GND3
GND4 LIL2 LIR2 10pF CAP2 CAP1 AOL1 AOR1 CAP4 AOL2 AOR2 220nF AVCC AOR2 AOL2 AOR1 AOL1 LIR2 LIL2
GND1
220kW 100nF RESET CAP7
8203-14.EPS
Note Resistor should short-circuited case only supply voltage application.
29/31
STV8203
PACKAGE MECHANICAL DATA PINS PLASTIC SHRINK
.015 0,38 Gage Plane
SDIP42
Dimensions
Min. 0.51 3.05 0.36 0.76 0.23 37.85 15.24 12.70
Millimeters Typ.
Max. 5.08 4.57 0.56 1.14 0.38 38.35 16.00 14.48
Min. 0.020 0.120 0.0142 0.030 0.0090 1.490 0.60 0.50
Inches Typ.
Max. 0.200 0.180 0.0220 0.045 0.0150 1.510 0.629 0.570
3.81 0.46 1.02 0.25 38.10 13.72 1.778 15.24
0.150 0.0181 0.040 0.0098 0.540 0.070 0.60
2.54
3.30
0.10
0.130
30/31
SDIP42.TBL
18.54 1.52 3.56
0.730 0.060 0.140
PMSDIP42.EPS
STV8203
PACKAGE MECHANICAL DATA PINS FULL PLASTIC QUAD FLAT PACK (TQFP) (THIN)
0,10 .004 inch SEATING PLANE
Dimensions
Min. 0.05 1.35 0.30 0.09
Millimeters Typ.
1.40 0.37 12.00 10.00 8.00 0.80 12.00 10.00 8.00 0.60 1.00
Max. 1.60 0.15 1.45 0.40 0.20
Min. 0.002 0.053 0.012 0.004
Inches Typ.
0.055 0.015 0.472 0.394 0.315 0.031 0.472 0.394 0.315 0.024 0.039
Max. 0.063 0.006 0.057 0.016 0.008
0.45
0.75
0.018
0.030
4Y.TBL
(Min.), (Max.)
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31/31
PM-4Y.EPS
0,25 .010 inch GAGE PLANE

MULTISTANDARD SOUND DEMODULATOR PERFORMS MONO, CARRIERS NICAM REC

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