STV82X6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV82X6' PDF : 97 Pages View PDF
Demodulator Block
STV82x6
Table 5: NICAM System Transmission Modes
System Mode
NICAM_STAT[
4:1]
NICAM
De-emphasis
CH_LANG[1:0]
Sound
Selection
NICAM Stereo
NICAM Dual Mono
(CH1 = A, CH2 = B)
NICAM Mono+Data
(D1 = A, D2 = Data)
NICAM Data
1000
J17
1010
J17
1001
J17
1011
J17
NICAM Stereo (no backup)
0000
J17
NICAM Dual Mono (no backup) (D1
= B, D2 = C)
0010
J17
NICAM Mono+Data (no backup)
(D1 = B, D2 = Data)
0001
J17
NICAM undefined (no backup)
X1XX
J17
XX
NICAM Stereo
01
NICAM Mono A
10
NICAM Mono B
XX
NICAM Mono A
XX
FM/AM Mono
01
FM/AM Mono A
00
NICAM Stereo
01
FM/AM Mono A
10
NICAM Mono B
11
NICAM Mono C
01
FM/AM Mono A
10
NICAM Mono B
XX
FM/AM Mono
Sound
Backup
FM/AM Mono
FM/AM Mono
Mute
FM/AM Mono
X
X
Mute
X
Mute
X
Mute
X
Note: D1 and D2 define the two channels encoded in the NICAM packet.
2.2
Note:
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.
A change in the crystal frequency is compatible with other default I²C programming values,
including those of the built-in Automatic Standard Recognition System.
16/97
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