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STV8236 Datasheet(PDF) 16 Page - STMicroelectronics

Part # STV8236
Description  Multistandard TV Audio Processor and Digital Sound Demodulator
PDF  97 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV8236 Datasheet(HTML) 16 Page - STMicroelectronics

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Demodulator Block
STV82x6
16/97
Note:
D1 and D2 define the two channels encoded in the NICAM packet.
2.2
System Clock
The System Clock integrates a low-jitter PLL clock and can be fully reprogrammed via registers
PLL_DIV, PLL_MD, PLL_PEH and PLL_PEL. The default values are designed for a standard
27-MHz quartz crystal frequency, which is the recommended frequency for minimizing potential
RF interference in the application. This sinusoidal clock frequency, and any harmonic products,
remains outside the TV picture and sound IF (PIF/SIF) and Band-I RF passbands and has been
selected in order to reduce the risk of potential interference to the TV IF and RF system.
However, if required, the PLL clock can be re-programmed for an other quartz crystal frequency
within a range between 23 and 30 MHz.
Note:
A change in the crystal frequency is compatible with other default I²C programming values,
including those of the built-in Automatic Standard Recognition System.
Table 5: NICAM System Transmission Modes
System Mode
NICAM_STAT[
4:1]
NICAM
De-emphasis
CH_LANG[1:0]
Sound
Selection
Sound
Backup
NICAM Stereo
1000
J17
XX
NICAM Stereo
FM/AM Mono
NICAM Dual Mono
(CH1 = A, CH2 = B)
1010
J17
01
NICAM Mono A
FM/AM Mono
10
NICAM Mono B
Mute
NICAM Mono+Data
(D1 = A, D2 = Data)
1001
J17
XX
NICAM Mono A
FM/AM Mono
NICAM Data
1011
J17
XX
FM/AM Mono
X
NICAM Stereo (no backup)
0000
J17
01
FM/AM Mono A
X
00
NICAM Stereo
Mute
NICAM Dual Mono (no backup) (D1
= B, D2 = C)
0010
J17
01
FM/AM Mono A
X
10
NICAM Mono B
Mute
11
NICAM Mono C
NICAM Mono+Data (no backup)
(D1 = B, D2 = Data)
0001
J17
01
FM/AM Mono A
X
10
NICAM Mono B
Mute
NICAM undefined (no backup)
X1XX
J17
XX
FM/AM Mono
X



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