Philips Semiconductors
Product specification
Radio Data System (RDS) demodulator
BLOCK DIAGRAM
SAA6579
handbook, full pagewidth
47 pF
4.332/8.664 MHz
82 pF
+5 V
2.2 k
Ω
OSCI
13
OSCO
14
0.1
µF
V
DDD
12
MPX
signal
MUX 4
330 pF
SCOUT 8
560 pF
CIN 7
ANTI-
ALIASING
FILTER
57 kHz
BANDPASS
(8th ORDER)
RECONSTRUCTION
FILTER
OSCILLATOR
AND
DIVIDER
QUALITY BIT
GENERATOR
1 QUAL
CLOCKED
COMPARATOR
COSTAS LOOP
VARIABLE AND
FIXED DIVIDER
BIPHASE
SYMBOL
DECODER
DIFFERENTIAL 2
DECODER
16
RDDA
+5
V
VDDA 5
0.1
µF
SAA6579
V
P1
CLOCK
REGENERATION
AND SYNC
RDCL
Vref 3
REFERENCE
VOLTAGE
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
15
T57
2.2
µF
6
VSSA
9
MODE
10
TEST
11
VSSD
MEH162
Via pin MODE two different crystal frequencies can be used.
MODE
LOW
HIGH
CRYSTAL CLOCK
4.332 MHz
8.664 MHz
Fig.1 Block diagram and application circuit.
1997 Feb 24
3
PHILIPS [ NXP SEMICONDUCTORS ]
