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TDA8205 Datasheet

  • TDA8205

  • NICAM QPSK DEMODULATOR

  • 165.09KB

  • 8頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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TDA8205
NICAM QPSK DEMODULATOR
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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
SHRINK 42
(Plastic Package)
ORDER CODE :
TDA8205
PIN CONNECTIONS
GND
XC1
XC2
DF2
DF1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
LF1
LF2
XK1
V
CC
EAIR
EAIL
SAIR
SAIL
MAI
CAP
AMOR
AMOL
DC2
DC1
AOR
AOL
GND
MMO
TEST
NDO
CK728
8205-01.EPS
BG
IN
I
IN
AGC
V
CC
V
DD
LFIL1
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.
October 1993
RG
GND
RFIL1
RESET
V
DD
SERI
DACDL
DACDR
GND
CK11648
1/8

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