JVC KD-SX8250 Service Manual page 38

KD-SX8250/KD-SX780
TB2118F-X (IC21) : PLL
1.Terminal Layout
2.Block diagram
osc Buff.
2
1
XO
OSC circuit
24
XI
FM IN
15
AMP
AMIN
16
AMP
IFC 13 AMP
CE
3
DIN
4
Interface
CK
5
DOUT 6
3.Pin Function
Pin
Symbol I/O Function
No.
1 XOUT O Crystal oscillator pin
2 OSC - Non connect
3 CE I Chip enable input
4 DI I Serial data input
5 CK I Clock input
6 DOUT Serial data output
O
7 SR O Register control pin
8 I/O1 I/O I/O ports
9 I/O2 I/O I/O ports
10 OUT1 - Non connect
11 OUT2 - Non connect
12 VDD2 - Single power supply for REF. frequency block
1-38
ON/OFF
Reference Counter
Prescaler
20-bit BINARY COUNTER
Resistor 1
Resistor 2
Serial
I/O PORT
8
7
I/O -1 I/O -2
SR
Phase
Comparator
4-bit
Swallow counter
12-bit
Programmable counter
22-bit
40bit shift register
OUTPUT PORT
Vdd
10 11 12
9 14
vdd
out-1 out-2
vdd2
Pin
Symbol I/O
No.
13 IFC I
14 VDD -
15 FMIN I
16 AMIN I
17 DGND -
18 FMCP O
19 VT -
20 AMCP O
21 VCC -
22 RF I
23 AGND -
24 XIN I
Constant
power supply voltage
AM CP.
20
switch
RF
22
19
vt
+
-
18
FM cp
switch
Vcc
17 21
23
d-gnd vcc a-gnd
Function
IF signal input
Power pins for digital block
FM band local signal input
AM band local signal input
Connect to GND (for digital circuit)
Charge pump output for FM
Tuning voltage biased to 2.5V.
Charge pump output for AM
Power pins for analog block
Ripple filter connecting pin
Connect to GND (for analog circuit)
Crystal oscillator pin