Terminal Description - Onkyo TX-SR501/E Service Manual

IC BLOCK DIAGRAMS AND DESCRIPTIONS
BU1923F(RDS Decoder)
BLOCK DIAGRAM
(4)
MUX
(3)
VREF
(5)
VDD1
Analog
Power supply
(6)
VSS1
(12)
VDD2
Digital
power supply
(11)
VSS2
(13)
X1 XO

TERMINAL DESCRIPTION

Pin No. Symbol
1 QUAL
2 RDATA
3 Vref
4 MUX
5 VDD1
6 Vss1
7 Vss3
8 CMP
9 T2
10 T1
11 VDD2
12 Vss2
13 XI
14 XO
15 (NC)
16 RCLK
+
anti-aliasing
filter
PLL
PLL
57kHz
1187.5Hz
RDS/ARI
Reference
clock
(14)
Pin name
Demodulator quality Good data : High , Bad data : Low
Demodulator data RDS data output
Reference voltage 1/2 VDD1
Input Composite signal input
Analog power supply 4.5V to 5.5V
GND
Comparator input C-junction
Test input Open or connected to ground
Digital power supply 4.5V to 5.5V
Crystal oscillor Connects to 4.332MHz oscillator
-
Demodulator clock 1187.5Hz clock
Page 37
VSS3
(7)
8ch Switched
capacitor filter
Bi-phase
decoder
Measurement
circuit
(10)
T1
Function
-
-
TX-SR501/E
CMP
(8)
Comparator
(16)
RCLK
(1)
QUAL
(2)
RDATA
Differential
decoder
(9)
T2