Harman Kardon AVR 3550 Service Manual page 39

RDS demodulator (SAA6579TV1) : IC71
BLOCK DIAGRAM
handbook, full pagewidth
MPX
signal
4
MUX
330 pF
8
SCOUT
560 pF
7
CIN
COMPARATOR
+5 V
V DDA
5
0.1 µF
V ref
3
2.2 µF
Via pin MODE two different crystal frequencies can be used.
MODE CRYSTAL CLOCK
LOW 4.332 MHz
HIGH 8.664 MHz
ANTI-
57 kHz
ALIASING
BANDPASS
FILTER
(8th ORDER)
COSTAS LOOP
CLOCKED
VARIABLE AND
FIXED DIVIDER
V
P1
CLOCK
REFERENCE
REGENERATION
VOLTAGE
AND SYNC
6
V SSA
Fig.1 Block diagram and application circuit.
47 pF
4.332/8.664 MHz
OSCI
13
OSCILLATOR
RECONSTRUCTION
FILTER
DIVIDER
BIPHASE
SYMBOL
DECODER
SAA6579
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
9
MODE
82 pF
+5 V
2.2 k Ω
0.1 µF
V
OSCO
DDD
14
12
QUALITY BIT
AND
GENERATOR
DIFFERENTIAL
DECODER
10 11
V SSD
TEST
QUAL
1
RDDA
2
RDCL
16
T57
15
MEH162