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參數(shù)資料
| 型號： | TDA8205 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | NICAM QPSK DEMODULATOR |
| 中文描述： | 麗音QPSK解調(diào)器 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 163K |
| 代理商： | TDA8205 |
TDA8205
NICAM QPSK DEMODULATOR
October 1993
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42
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GND
XC1
XC2
DF2
DF1
AGC
LFIL1
RG
GND
RFIL1
RESET
SERI
DACDL
DACDR
GND
CK11648
CK728
NDO
TEST
MMO
GND
AOL
AOR
DC1
DC2
AMOL
AMOR
CAP
MAI
SAIL
SAIR
EAIL
EAIR
XK1
LF1
LF2
V
CC
IN
I
V
DD
BG
IN
CC
V
DD
V
8
PIN CONNECTIONS
SHRINK 42
(Plastic Package)
ORDER CODE :
TDA8205
.
HIGHLY INTEGRATED TWO CHIP SOLU-
TION FOR NICAM DEMODULATION (using
TDA8204 decoder)
.
AUTOMATIC DUAL STANDARD DEMODULA-
TION
6.552MHz FOR I SYSTEM
5.85MHz FOR B/G SYSTEM
.
40dB RANGE AGC
.
SINGLE CRYSTAL OPERATION
.
NICAM 728 DATA AND CLOCK RECOVERY
.
LOW PASS FILTER FOR PWM CODED
AUDIO SIGNALS AND J-17 DE-EMPHASIS
.
AUTOMATIC FM MONO SELECTION BY RE-
SERVE SOUND SWITCH FUNCTION
.
VERSATILE AUDIO SWITCHING MATRIX
.
AUTOMATIC MUTE FUNCTION
DESCRIPTION
The TDA8205 is essentially divided into two signal
processing sections. The first section handles all
the NICAM signal acquisition, the QPSK demodu-
lator and clock and data recovery circuits. The key
point to note about this section is the dual fre-
quency synthesiser. By use of only one quartz
crystal, the IC is able to demodulate QPSK signals
from either system I or system B/G in an automatic
way. The second section of the TDA8205 manages
the analog parts of the twin digital-to-analog con-
verters (DACs) and all filtering and audio switching
downstream of the DACs. A simple serial bus from
the TDA8204 allows control of the switch functions
by the CTV system microcontroller.
1/8
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