TDA8205 Datasheet, PDF (1/8 Pages) STMicroelectronics – NICAM QPSK DEMODULATOR

TDA8205
NICAM QPSK DEMODULATOR
. _{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
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
GND
1
XC1
2
XC2
3
DF2
4
DF1
5
BG _IN
6
I_IN
7
AGC
8
V_CC
9
V_DD
10
LFIL1
11
RG
12
GND
13
RFIL1
14
RESET
15
V_DD
16
SERI
17
DACDL
18
DACDR
19
GND
20
CK11648 21
42
LF1
41
LF2
40
XK1
39
V_CC
38
EAIR
37
EAIL
36
SAIR
35
SAIL
34
MAI
33
CAP
32
AMOR
31
AMOL
30
DC2
29
DC1
28
AOR
27
AOL
26
GND
25
MMO
24
TEST
23
NDO
22
CK728
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