STV8206 STMicroelectronics, STV8206 Datasheet - Page 13

• Manufacturer Part Number: STV8206
• Description: IC TV AUDIO PROC/DEMOD 80-TQFP
• Manufacturer: STMicroelectronics
• Type: Audio Processorr

Specifications of STV8206

• Applications: Radio
• Mounting Type: Surface Mount
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STV82x6
System
D/K1
D/K2
D/K3
M/N
B/G
D/K
L
I
Each mono and stereo standard can be removed (or added) from the List of Standards to be
recognized by programming registers
standard is displayed in register
system via pin IRQ. This flag must be reset by re-programming the MSBs of register
while checking the detected standard status by reading registers AUTO_STAT,
ZWT_STAT. Moreover, the detection of Stereo mode during demodulation is also flagged in register
AUTO_STAT
Important: L/L’ and D/K standards cannot be automatically processed because the same frequency
is used for the MONO carrier. An exclusive L/DK selection must programmed in register
AUTO_CTRL. This may be externally controlled by detecting the RF modulation sign, which is
negative for all TV standards except L/L’.
To recover out-of standard FM deviations or the Sound Carrier Frequency Offset, additional I²C
controls are provided without interfering with the Automatic Standard Recognition System
(AUTOSTD).
DK-NICAM Overmodulation Recovery: Four different FM deviation ranges can be selected (via
register AUTO_CTRL) for the DK standard while the AUTOSTD system remains active. The
maximum FM deviation is 500 kHz in DK Mono mode and 350 kHz in DK NICAM mode (limited by
overlapping FM and NICAM spectrum values). The demodulated signal peak level (proportional to
the FM deviation) is detected by the Peak Detector and written to registers
PEAK_DET_STATR. This value is used to implement Automatic Overmodulation Detection via an
external I²C control.
Important: Only the selection of the 50 kHz FM deviation standard is compatible with the other DK-
A2* standards (DK1, DK2 or DK3). These standards must be removed from the list of standards
(registers
only for DK-NICAM standards.
FM Mono
FM 2 Carriers
FM Mono
FM/NICAM
FM 2 Carriers
FM Mono
FM/NICAM
AM Mono
AM/NICAM
FM Mono
FM/NICAM
FM 2 Carriers
FM 2 Carriers
FM 2 Carriers
Table 3: Standards covered by the Automatic Standard Recognition System (AUTOSTD)
Sound Type
AUTO_SCKM
and on output pin ST.
Name
Type
A2+
A2*
A2
and AUTO_SCKST) when programming larger FM deviations reserved
Carrier 1
(MHz)
4.5
5.5
6.0
6.5
AUTO_STAT
Carrier 2
AUTO_SCKM
(MHz)
4.724
5.850
5.742
6.552
5.850
5.850
6.258
6.742
5.742
and any change to standard is flagged to the host
Min.
FM/AM Deviation
0.5
15
27
27
27
and AUTO_SCKST, respectively. The identified
Typ.
27
50
50
50
Max.
1.0
50
80
80
80
De-emphasis
75 µs
50 µs
50 µs
50 µs
50 µs
50 µs
J17
J17
J17
J17
PEAK_DET_STATL
Demodulator Block
NICAM_STAT
Roll-
(%)
100
100
off
40
40
40
AUTO_CTRL
Frequency
54.6875
54.6875
55.069
(kHz)
Pilot
and
13/97
and