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參數(shù)資料
| 型號： | STV8226 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Multistandard TV Audio Processor and Digital Sound Demodulator |
| 中文描述： | 多標(biāo)準(zhǔn)電視音頻處理器和數(shù)字聲音解調(diào)器 |
| 文件頁數(shù)： | 16/97頁 |
| 文件大?。?/td> | 1871K |
| 代理商： | STV8226 |
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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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