Philips MC-V320, Service Manual

Page: 29 / 62

Pin No. Pin name Symbol Functions Input/Output type
1 QUAL Demodulator quality Type C Good data: High, bad data : Low
Refer to output data timing
6 V
SS1
7
CMP Comparator input Type D
C-junction (refer to input/output circuits )
8
V
SS3
GND
2 RDATA Demodulator data
9 T2
Test input Type B Open or connected to ground
10 T1
3 Vref Reference voltage
4 MUX Input
Type E
Type D
1/2 V
D D1
(refer to input/output circuits)
Composite signal input (refer to input/output circuits)
11 V
D D2
Digital power supply 4.5V to 5.5V
12 V
S S2
13 XI
Crystal oscillator Type A
Connects to 4.332MHz oscillator
(refer to input/output circuits)
14 XO
15
(N.C.)
Type C
16 RCLK Demodulator clock 1187.5Hz clock (refer to the timing diagram)
5 V
DD1
Analog power supply 4.5V to 5.5V
Type A
Type B
Type D
10M
Type C
Type E
+
+
RDS/RBDS DECODER
BU1924F RDS/RBDS DECODER
BU1924F
Pins Description
BLOCK DIAGRAM
7-5 7-5
VSS3
8th Switched
capacitor filter
Bi-phase
decoder
Measurement
circuit
Reference
clock
PLL
1187.5Hz
Differential
decoder
comparator
CMP
RCLK
QUAL
RDATA
T2 T1
560p
2.2 µ F
120k 100k
100k
270p
V
SS
3
V
SS
2
V
SS
1
V
DD
2
V
DD
1
V
ref
MUX
Digital
Power supply
Analog
Power supply
anti-aliasing
filter
7
16
9
10
XI XO
4.332MHz
33pF
3
3
2
1
1
33pF
13
11
12
6
3
4
5
14
1
2
8
PLL
57kHz
RDS
BU1924/F/FS
1: V
DD
1 and V
DD
2 are separated within the IC.
2: Have V
DD
2(digital power supply) of a sufficiently low impedance.
3: Match the capacitor constants with the crystal manufacturer.