JVC MX-K30 Service Manual page 25

LC72136N (IC2) : PLL Frequency synthesizer
1.Terminal layout
XTI 1
FM 2
CE 3
DI 4
CLOCK 5
DO 6
VCOSTOP 7
AM/FM 8
LW 9
MW 10
SDIN 11
2. Block diagram
1
22
16
1/2
15
3
4
C B
2
I/F
5
6
Power
on
17
Reset
21
3. Pin function
Pin
I/O
No. Symbol
X'tal oscillator connect (75KHz)
XTI I
1
LOW:FM mode
O
FM
2
When data output/input for 4pin(input) and
CE I
3
6pin(output): H
Input for receive the serial data from
I
4 DI
controller
Sync signal input use
I
CLOCK
5
Data output for Controller
DO O
6
Output port
"Low": MW mode
O
7 VCOSTOP
Open state after the power on reset
AM/FM O
8
Input/output port
-
NC
9
Input/output port
NC -
10
Data input/output
SDIN I/O
11
XT
22
GND
21
LPFI
20
LPFO
19
PD
18
VCC
17
FMIN
16
AMIN
15
NC
14
IFCNT
13
IFIN
12
Reference
Driver
Swallow Counter Swallow Counter
1/16,1/17 4bit 1/16,1/17 4bit
12bit
Programmable
DriverS
Data Shift Register & Latch
7 8 2 11 13
Function
Phase
Detector
18
Charge Pump
19
20
Unlock
Detector
12
Universal
Counter
Pin
Symbol I/O
No.
12 IFIN I
IFCNT O
13
14 NC -
AMIN I
15
FMIN I
16
17 VCC -
PD O
18
19 LPFO O
I
20 LPFI
GND -
21
22 XT I
Function
IF counter signal input
IF signal output
Not use
AM Local OSC signal output
FM Local OSC signal input
Power supply(VDD=4.5 5.5V)
When power ON:Reset circuit move
PLL charge pump output(H: Local OSC
frequency Height than Reference frequency.
L: Low Agreement: Height impedance)
Output for active lowpassfilter of PLL
Input for active lowpassfilter of PLL
Connected to GND
X'tal oscillator(75KHz)
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