JVC MX-KA3 Service Manual page 32

MX-KA3
LC72136N (IC2) : PLL Frequency synthesizer
1.Terminal layout
XTI
FM
CE
DI
CLOCK
DO
VCOSTOP
AM/FM
LW
MW
SDIN
2. Block diagram
1
22
16
15
3
4
C B
2
I/F
5
6
Power
on
17
Reset
21
3. Pin function
Pin
I/O
No. Symbol
XTI I
1
FM O
2
I
3 CE
DI I
4
I
5 CLOCK
O
DO
6
VCOSTOP O
7
AM/FM O
8
NC -
9
-
10 NC
SDIN I/O
11
1-32
1 XT
22
2 GND
21
3 LPFI
20
4 LPFO
19
5 PD
18
6 VCC
17
7
FMIN
16
8
AMIN
15
9
NC
14
10
IFCNT
13
11
IFIN
12
Reference
Driver
Swallow Counter Swallow Counter
1/2 1/16,1/17 4bit 1/16,1/17 4bit
12bit
Programmable
DriverS
Data Shift Register & Latch
11 13
7 8 2
Function
X'tal oscillator connect (75KHz)
LOW:FM mode
When data output/input for 4pin(input) and
6pin(output): H
Input for receive the serial data from
controller
Sync signal input use
Data output for Controller
Output port
"Low": MW mode
Open state after the power on reset
Input/output port
Input/output port
Data input/output
Phase
Detector
18
Charge Pump
19
20
Unlock
Detector
12
Universal
Counter
Pin
Symbol I/O
No.
IF counter signal input
12 IFIN I
IF signal output
13 IFCNT O
Not use
NC -
14
AM Local OSC signal output
15 AMIN I
FM Local OSC signal input
FMIN I
16
Power supply(VDD=4.5
-
17 VCC
When power ON:Reset circuit move
PLL charge pump output(H: Local OSC
PD O
18
frequency Height than Reference frequency.
L: Low Agreement: Height impedance)
Output for active lowpassfilter of PLL
19 LPFO O
Input for active lowpassfilter of PLL
LPFI I
20
Connected to GND
GND -
21
X'tal oscillator(75KHz)
22 XT I
Function
5.5V)