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TDA8205 Datasheet(PDF) 2 Page - STMicroelectronics

Part # TDA8205
Description  NICAM QPSK DEMODULATOR
PDF  8 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA8205 Datasheet(HTML) 2 Page - STMicroelectronics

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PIN ASSIGMENT
Pin No
Pin Name
Function
Pin No
Pin Name
Function
1
GND
Ground
22
CK728
728kHz Clock Intput
2
XC1
Optional Crystal
23
NDO
NICAM Data Output
3
XC2
Optional Crystal
24
TEST
To be connected to GND
4
DF2
Data Filter 2 (eye monitor)
25
MMO
Matrix Mute Out
5
DF1
Data Filter 1 (eye monitor)
26
GND
Ground
6BGIN
System B/G Input
27
AOL
Audio Output Left
7IIN
System I Input
28
AOR
Audio Output Right
8
AGC
AGC Filter Capacitor
29
DC1
Decoupling 1
9VCC
+12V Supply
30
DC2
Decoupling 2
10
VDD
+5V Supply
31
AMOL
Audio Mutable Output Left
11
LFIL1
Left Filter 1 (J-17 De-emphasis)
32
AMOR
Audio Mutable Output Right
12
RG
Gain Setting Resistor for DAC
33
CAP
Decoupling Capacitor
13
GND
Ground
34
MAI
Mono Audio Input
14
RFIL1
Right Filter 1 (J-17 De-emphasis)
35
SAIL
Stereo Audio Input Left
15
RESET
Reset Chip
36
SAIR
Stereo Audio Input Right
16
VDD
+5V Supply
37
EAIL
External Audio Input Left
17
SERI
Interchip Serial Bus Input
38
EAIR
External Audio Input Right
18
DACDL
DAC Data Left Input
39
VCC
+12V Supply
19
DACDR
DAC Data Right Input
40
XK1
11.648MHz Crystal
20
GND
Ground
41
LF2
Loop Filter 2
21
CK11648
11.648MHz Clock Output
42
LF1
Loop Filter 1
SERIAL
INTERFACE
LPF
MUTE
SWITCH
LPF
DUAL FREQ
SYNTHESISER
QSPSK
DEMOD
CLOCK
& DATA
RECOVERY
AGC
SWITCH
DAC
DAC
TDA8205
39
8
5
4
42
23
22211918
11
34 35 36
31
32
37
38
27
28
29
30
25
20
17
33
14
12
15
24
6
7
1
26
13
TEST
RESET
I
IN
BG
IN
GND
RG
RFIL1
CAP
SERI
MMO
DC1
DC2
AOL
AOR
41
9
16
10
MATRIX
SWITCH
XC1
2
340
XC2
XK1
GND
GND
GND
BLOCK DIAGRAM
BLOCK DIAGRAM DESCRIPTION
The QPSK signal enters the IC via two inputs after
passing through two external bandpass filters at
the relevant frequencies of 6.552MHz and
5.85MHz for system I and B/G respectively. The
two inputs enter a source selection switch and pass
immediately to an AGC block which has a total
range of 40dB. The resulting levelled signal passes
to the QPSK demodulator which recovers the NI-
CAM 728Kb/s data stream by means of carrier and
clock recovery circuits.
Carrier recovery is achieved with a baseband re-
modulator which consists of a phase locked loop
with a switchable phase detector. This allows it to
lock to one of four possible phases of the QPSK
TDA8205
2/8



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