2
24
23
22
21
20
19
18
17
16
15
14
13
1
24
2
15
16
13
3
4
5
6
7
8
9
10 11
12
14
17
21
23
18
19
22
20
Buff.
ON/OFF
OSC circuit
AMP
AMP
AMP
Reference Counter
Phase
Comparator
Prescaler
4-bit
Swallow counter
12-bit
Programmable counter
Constant
power supply voltage
AM CP.
switch
switch
RF
Vt
FM cp
+
-
+
-
a-gnd
vccd-gndvdd
vdd2
out-2out-1
I/O -2I/O -1
SL
osc
XO
XI
FM VCO
AMVCO
IFC
CE
DIN
CK
DOUT
20-bit BINARY COUNTER
Serial
Interface
Resistor 1
Resistor 2
22-bit
40bit shift register
I/O PORT
OUTPUT PORT
Vdd
Vcc
Pin
No.
Symbol I/O Function
Pin
No.
Symbol I/O Function
1 XOUT O Crystal oscillator pin 13 IFC I IF signal input
2 OSC - Non connect 14 VDD - Power pins for digital block
3 CE I Chip enable input 15 FMIN I FM band local signal input
4 DI I Serial data input 16 AMIN I AM band local signal input
5 CK I Clock input 17 DGND - Connect to GND (for digital circuit)
6 DOUT O Serial data output 18 FMCP O Charge pump output for FM
7 SR O Register control pin 19 Vt - Tuning voltage biased to 2.5V.
8 I/01 I/O I/O ports 20 AMCP O Charge pump output for AM
9 I/02 I/O I/O ports 21 VCC - Power pins for analog block
10 OUT1 - Non connect 22 RF I Ripple filter connecting pin
11 OUT2 - Non connect 23 AGND - Connect to GND (for analog circuit)
12 VDD2 - Single power supply for REF. frequency block 24 XIN I Crystal oscillator pin
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