Philips FWM37 Service Manual page 16

DIAGRAMA EM BLOCO INTERNO
DEMODULADOR RDS/RBDS - IC SAA6581T
handbook, full pagewidth
SCOUT
C1
57 kHz
multiplex MPX 4
8th ORDER
input
BANDPASS FILTER
330 pF
SAA6581T
V DDA POWER
5
+5 V
SUPPLY
CONTROL
AND RESET
C2
100 nF
6 3
V SSA V ref
TCON
C3
2.2 µF
DESCRIÇÃO DO PINO
DEMODULADOR RDS/RBDS - IC SAA6581T
PINNING
SYMBOL PIN DESCRIPTION
QUAL 1 signal quality indication output
RDDA 2 RDS data output
1
V 3 reference voltage output ( / V
ref 2
MPX 4 multiplex signal input
V 5 analog supply voltage (5 V)
DDA
V 6 analog ground (0 V)
SSA
CIN 7 comparator input
SCOUT 8 switched capacitor filter output
MODE 9 oscillator frequency select input
SYNC 10 ARI clamping control input
V 11 digital ground (0 V)
SSD
V 12 digital supply voltage (5 V)
DDD
OSCI 13 oscillator input
OSCO 14 oscillator output
TCON 15 test control input
RDCL 16 RDS clock output
560 pF
+5 V
C7
C6
V DDD
CIN 100 nF
8 7 12
10 SYNC
16 RDCL
CLOCKED RDS/RBDS
COMPARATOR 2 RDDA
DEMODULATOR
SIGNAL QUALITY 1 QUAL
DETECTOR
TEST OSCILLATOR
AND CLOCK
15 9 13 14 11
MHB899
V SSD
MODE OSCI OSCO
C4 C5
Q1
47 pF 56 pF
)
DDA QUAL 1 16 RDCL
2 15
RDDA TCON
V ref 3 14 OSCO
4 13
MPX OSCI
SAA6581T
V DDA 5 12 V DDD
V SSA 6 11 V SSD
CIN 7 10 SYNC
SCOUT 8 9 MODE
MHB900
DIAGRAMA EM BLOCO INTERNO
REGULADOR DE TENSÃO POSITIVA - IC KA7805
FW-M37 15