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STV8203
MULTISTANDARD TV SOUND DEMODULATOR
STV8203
MUL TISTANDARD TV SOUND DEMODULATOR
January 1999
PRELIMINARY DATA. PERFORMS FM MONO, FM 2 CARRIERS
AND NICAM RECEPTION. B/D/G/H/I/K/K1/K2/L/L’. UP TO 500kHz DEVIA TION FM DEMODULATOR. ALL PRE AND POST-PROCESSING INTE-
GRATED FILTERS, ALIGNMENT FREE. STANDARD RECOGNITION FLAG. SINGLE QUARTZ CRYSTAL.I2 C BUS CONTROLLED. AM AND DOUBLE SCART AUDIO MATRIX. STAND-BY WITH THRU MODE. SINGLE BIT DACS. EASY IMPLEMENTATION OF AUTOSTAN-
DARD MODE. ADVANCED OPERATING MODE FOR FULL
CUSTOMIZATION. SIF AGC WITH WIDE RANGE
DESCRIPTION
The STV8203 provides all the necessary circuitry
for demodulation of all Nicam and German stereo
audio transmission. It is very suitable for TV appli-
cations as well as for VCR, Personal Computer or
Set Top Box applications. Different transmission
standards are automatically detected and demodu-
lated without user intervention. The recovered
audio signals can be made available in analog
form. More, the STV8203 integrates an audio ma-
trix with a THRU mode when the IC is in stand-by.
Very flexible applications are possible thanks to
smart I2 C program modes and large choice of
appropriate audio processing ICs.
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SDIP42 PIN CONNECTIONS
TQFP44 PIN CONNECTIONS
STV8203
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PIN LIST
STV8203
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BLOCK DIAGRAM
DEMODULATOR CORE BLOCK DIAGRAM
STV8203
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FUNCTIONAL DESCRIPTION
As can be seen from the block diagram, the input to
the demodulator section is selectable from one of
two I.F. sources via the I2 C bus. The selected signal
is then passed through an AGC block, having a
range of 28dB, before being digitised in the
ADC unit. A single quartz crystal (suggested value :
between 24.712MHz and 27MHz) is used for the all
the digital processing, including demodulation, iden-
tification, control, filtering. This has the advantage
of a single clock signal source for the whole IC which
eliminates problems of multiple clock. The single
clock can be chosen to minimize interference in the
TV IF and RF stages of the tuner system.
The demodulator system can identify and demodu-
late all the standard described in the T able 1. The re-
sult of the recognition is flagged up to the host
system via the I2 C bus communication system.
In the case of NICAM transmissions, in the event
of a failure of the received signal or a degradation
of the bit error rate (BER) below a prescribed level,
the system will automatically default to the reserve
sound transmission on mono FM or AM.
For FM demodulation, the discriminator can nor-
mally handle signals having 250kHz deviation. This
covers all European standards, and ensure an
optimized compromise for the signal to noise ratio
in one hand, and over modulation in the other hand.
However, it is possible to extand the deviation
range up to 500kHz (I2 C programmable) in order to
cover requests of some broadcasters.
Fully automatic standard recognition and setting
can be achieve using simple routines.
Appropriate de-emphasis networks in the digital
domain are applied to the resulting demodulated
signals (50μs, J17), followed by dematrixing if re-
quired. The digital datastream is then passed
through 2 x 16bits DACs before the audio matrix.
All this first section is working at 3.3V thanks to an
integrated voltage regulator. In stand-by mode, the
voltage regulator pulls the voltage down to zero,
ensuring no power dissipation in this part.
An audio matrix allows the selection of inputs ap-
plied on the outputs SCART1, SCART2 and MONO
according to the diagram shown in Figure 1.
The "MOUT" outputs either the signal L1, or R1 or
(L1+R1)/2. This allows to record the selected chan-
nel in mono mode, for example on the linear chan-
nel of a VCR simultanously with the stereo mode.
Maximum output swing is 1VRMS.
The audio matrix section has its own power supply
regulator, allowing to keep this part working even
when the rest is in stand-by mode. This achieves a
"THRU" mode from input "SCART1" to output
"SCART2" and input "SCART2" to output "SCART1".
The maximum output swing of both SCART1 and
SCART2 is 2VRMS.
Remark : Circuit operation is possible with only a
single 5V supply. In this case, the AVCC supply pin
is connected to 5V. Maximum output swing is then
limited to 1VRMS and a 6dB attenuation is automat-
ically added to the DAC output. In that case, the
resistor shown as R2 = 39Ω in the Application Dia-
gram (between Pin 8 and Pin 21) must be replace
by a short circuit to avoid clipping.
Figure 1 : Audio Matrix
STV8203
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Table 1 : Demodulated TV Sound Norms
Notes :1. STV8203 performs only limited AM demodulation. Report to Application Note. 50μs only, instead of 75μs.
FUNCTIONAL DESCRIPTION (continued)
STV8203
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USING STV8203
1 - Hardware
1.a - Power Supplies (see Figure 2)
The IC is using two main power supplies :
-DVDD5 supplies all the digital part VNom. = 5V.
This power supply can be switched-off in stand-
by mode.
-AVCC supplies the audio matrix part : if VNom. = 8V
then the output voltage swing on output pins can
reach 2VRMS, if VNom. = 5V then the output voltage
swing on output pins can reach 1VRMS.
1.b - Sound Subcarrier Filters
Sound demodulation and decoding are very easy
with this device providing all the necessary functions
for that purpose, including the channel filters.
These FIR base-band filters give the best selectivity
of the desired channel and provides in NICAM mode
the correct cosine roll-off response.
This implies that no external filters are required
(except may be a simple high-pass filter, if the saw
filters and sound IF demodulators used in the ap-
plication create picture interferences).
The filters can be automatically set for B/G/H/I/L/L’
standards. They can also be easily tuned through2 C for M, D, K, K1.
1.c - Audio Matrix
The mono output (MOUT) can output L1, R1 or
(L1+R1)/2 signal. A typical application is the possi-
bility to record a selected channel in mono mode on
the linear track of a VCR separately from the record-
ing of the stereo signal, providing the facility to select
between stereo or mono signals in the playback
mode in case of marginal noise conditions.
1.d - Stand-by
Stand-by with THRU mode : the analog part of the
device has its own power supply (AVCC) allowing
this part to keep working even when the digital part,
powered by the 5V power supply (DVDD5), is in
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
from SCARTIN to SCARTOUT.
2 - Software
Two modes of operation are available :
2.a - Optimized Program Mode
Four standards have default setting stored in order
to allow a very easy programmation. Only some
registers may have to be programmed (these reg-
isters are shown in bold in the Figure 3) but in most
cases, the reset values will be sufficient. In Fig-
ure 3, CTL and STAT represent registers which are
controlled by the "standard processor". These reg-
isters are located between address 23Hex and
3CHex in the complete list of registers.
2.b - Advanced Operation Mode
In that mode, all the read/write registers (as men-
tionned in the complete list) can be programmed
manually and changed from their reset values.
The additionnal registers accessible in this mode
are shown in bold in Figure 4. This mode can be
selected by putting the bits [3:0] of AO-CONTROL
register to 0.
Figure 2
STV8203
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USING STV8203 (continued)
Figure 3 : Optimized Program Mode
Figure 4 : Advanced Operation Mode
STV8203
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USING STV8203 (continued)
3 - Example of Applications
3.a - Very Low Cost TV Application
3.b - High-End TV Application
3.c - TV Application in PC
Figure 5
Figure 7
Figure 6
STV8203
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ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
RECOMMENDED OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS (Tamb = 25o C, unless otherwise specified)
GENERAL
IF INPUTS
STV8203
10/31
Figure 8 : Synoptic A
Figure 8 : Synoptic A
ELECTRICAL CHARACTERISTICS (Tamb = 25o C, unless otherwise specified) (continued)
FM DEMODULATION PATH (see Figure 8)
NICAM DEMODULATION PATH (see Figure 8)
AUDIO MATRIX (see Figure 9)
STV8203
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PROGRAMMING THE DEVICE
1 - I2 C Address and Protocol
Write
Read
S = Start, A = Acknowledge, P = Stop, N = No acknowledge.
Sub-address is the register address pointer ; this value auto-increments for both write and read.
2 - List of Registers
Registers not controlled by AUTOSTANDARD, except bits marked "*" which are controlled
SWD (Switch, Dematrix & De-emphasis)
AUDIO MATRIX
NICAM
AUTOSTANDARD
ZWEITON
DEMODULATOR
STV8203
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Registers controllable by AUTOSTANDARD
DEMODULATOR CHANNEL 2
DEMODULATOR CHANNEL 1
Note : This register must be kept to "0".
PROGRAMMING THE DEVICE (continued)
STV8203
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3 - Register Description
PROGRAMMING THE DEVICE (continued)
3.1 - Registers Not Controlled By Autostandard (except some mentioned bits)
PRE-FM (Prescale FM Level)
Address : 02
Type : R/W
Reset : 0001 1101
FM PRESCALE: 00000
0dB
+12dB
-12dB
(step size = 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 for the PLL, an FM deviation of 27kHz will result in a signal 17dB below full
scale before de-emphasis. At 1kHz, the internal de-emphasis gain is 14dB giving a level of -3dB. Full scale
output from the DAC is 2VRMS corresponding to 0dB. and so for 1VRMS, PRE-FM should be set to -3dB.
PRE-NICAM (Prescale NICAM Level)
Address : 03
Type : R/W
Reset : 0001 1101
NICAM PRESCALE: 00000
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 gain at this frequency is 9dB so for 1VRMS,
pre-nicam should be set to -3dB.
STV8203
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STD-CT-IIS (SWD Control)
Address : 04
Type : R/W
Reset : 0001 1000
GAIN : which should normally be set to its default value, can be used to change the dematrix gain
for CH1 = L+R.
dematrix gain : 0 : channel 1 = L/2+R/2, 1 : channel 1 = L+R
DEMOFF: bypasses the FM or Nicam de-emphasis : 1 = de-emphasis off
MUTE : mutes the DAC (FM or Nicam) : 1 = DAC muted
(only effective if the AUTOSTANDARD function is off)
SWD : Bits allow control of the mode of the switch/dematrix function as shown below.
(only effective if the AUTOSTANDARD function is off)
D1 = FM audio from CH1, D2 = FM audio from CH2, DS = dematrixed Zweiton stereo.
N1 = Nicam M1, N2 = Nicam M2, NS = Nicam stereo.
These bits are controlled by AUTOSTANDARD when this function is activated.
FMDC1, FMDC2 (FM DC Level)
Address : 05-06
Type : R
FM Frequency offset (dependent on the PLL 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.
PROGRAMMING THE DEVICE (continued)
STV8203
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PRE-LINE-IN (IF Input Selection and Audio Matrix Gain Control)
Address : 07
Type : R/W
Reset : 0000 1000
IF SWITCH : IF Input Switch
controls the IF input selection (0 = IF1).
AGC SWITCH OFF: can be used to switch-off the AGC amplifier..
LINE INPUTS GAIN: allow the levels of the analog line inputs (SCART1, SCART2 and MONO) to be
adjusted simultaneously.
0dB
-6dB
+6dB
(default setting)
(step size = 1dB, range = ±6dB)
AUD-MX-CNT (Audio Matrix Control)
Address : 08
Type : R/W
Reset : 0010 0010
These 8 bits are used to control the audio matrix configuration (see Figure 1).
PROGRAMMING THE DEVICE (continued)
STV8203
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Partno	Mfg	Dc	Qty	Available	Descript
STV8203	ST	N/a	20	avai	MULTISTANDARD TV SOUND DEMODULATOR