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3 7 63 1515 0
IC, LC72131D
Pin No.
Pin Name
1
X-IN
22
X-OUT
2
NC
3
CE
4
DI
5
CL
6
DO
7
T-BASE
8
MONO / BEAT
9
FM / SW
10
MW / SW
11
IF-MUTE
TE
L 13942296513
12
IF-IN
13
TUNE
14
NC
15
AM-IN
16
FM-IN
17
VDD
18
PD
19
A-IN
20
A-OUT
21
VSS
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I/O
I
A crystal oscillator (7.2MHz) is connected between these pins.
O
–
Not used.
I
To enable the IC. Active "H".
Digital data input from CPU
I
when relevant key is operated. Active "H".
I
To clock in the data DI.
O
Digital data output to CPU
O
Outputs a reference clock signal (8Hz) for the clock.
O
Outputs "H" when MONO / BEAT is switched.
Output "L" or "H" as follows:
2 BAND
O
AM
FM
H
L
Outputs "L" or "H" as follows:
2 BAND
O
AM
FM
L
L
O
To control internal counter.
I
General purpose counter input.
I
Receives "L" when station is tuned.
–
Not used.
I
Receives the AM local oscillator frequency signal.
I
Receives the FM local oscillator frequency signal.
–
Supply power to IC (+5V).
O
PLL charge pump output.
I
The MOS transistor for PLL active low pass filter.
O
–
Ground.
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8
Description
(M38B57MCH-P239FP)
( M38B57MCH-P239FP )
3 BAND
3 BAND
LW
MW
FM
MW
H
H
L
H
3 BAND
3 BAND
LW
MW
FM
MW
H
L
L
L
Q Q
3
6 7
1 3
1 5
co
.
- 36 -
9 4
2 8
.
SW
FM
L
L
SW
FM
H
L
0 5
8
2 9
9 4
2 8
m
9 9
9 9
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