RXD-M35
12
CIRCUIT DESCRIPTION
Pin No.
Pin Name
I/O
Description
1
QUAL
O
Output for signal quality indication.
2
RDS DATA
O
Demodulation data output.
3
VREF
I
Reference voltage input.
4
MUX
I
Composite signal input.
5
VDD1
-
Analog power supply.
6
VSS1
-
Analog GND.
7
VSS3
-
Analog GND.
8
CMP
I
Comparator.
9
T1
I
Test pin.
10
T2
I
Test pin.
11
VSS2
-
Digital GND.
12
VDD2
-
Digital power supply.
13
XI
I
Crystal oscillation circuit input.
14
XO
O
Crystal oscillation circuit output.
15
N.C.
-
Unused.
16
RDS CLK
I/O
Demodulation clock.
6-5 RDS Demodulator IC : BU1923F (IC103)
Pin No.
Pin Name
I/O
Description
1
V.DATA
I
Serial data input pin for control.
2
V.CE
I
Chip enable pin.
3
VSS
-
Ground pin.
4
TEST
-
Electronic volume control pin. (To be connected to the VSS.)
5
LOUT
26
ROUT
O
equalizer output pins.
6 , 7
LBASS2,LBASS1
24.25
RBASS1,RBASS2
-
Bass-band filter comprising capacitor and resistor connection pins.
8
LTRE
23
RTRE
-
Capacitor connection pins comprising treble band filter.
9
LE IN
22
RE IN
I
equalizer input pins.
10
LS OUT
21
RS OUT
O
Input selector output pins.
11,12
L CD, L TUNER
I
Input signal pins.
-
To be open or connected to VSS.
-
Reference voltage for analog ground.
-
Power supply pin.
I
Clock input pin for control.
6-6 Electronic Volume System IC : LC75342M (IC301)
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