Block Diagram; Pin Description - Kenwood FM Transceiver TK-481 Service Manual

TK-480/481
PLL System : SA7025DK (TX-RX Unit IC11)

Block diagram

Pin description

Pin No. Symbol
1 CLOCK Serial clock input.
2 DATA Serial data input.
3 STROBE Serial strobe input.
4 V Digital ground.
SS
5 RF Prescaler positive input.
IN
6 RF Prescaler negative input.
IN
7 V Prescaler positive supply voltage. This pin supplies power to the prescaler and RF input buffer.
CCP
8 REF Reference divider input.
IN
9 RA Auxiliary current setting; resistor to V
10 AUX Auxiliary divider input.
IN
11 PHA Auxiliary phase detector output.
12 V analog ground.
SSA
13 PHI Integral phase detector output.
14 PHP Proportional phase detector output.
15 V Analog supply voltage. This pin supplies power to the charge pumps, Auxiliary prescaler, Auxiliary and Reference buffers.
DDA
16 RN Main current setting; resistor to V
17 RF Fractional compensation current setting; resistor to V
18 LOCK Lock detector output.
19 TEST Test pin; connect to V
20 V Digital supply voltage. This pin supplies power to the CMOS digital part of the device.
DD
22
SEMICONDUCTOR DATA
CLOCK
DATA Serial input + Program latches
STROBE
Vss
EM FB PR
2 2
RF
IN 64/65/72
Main dividers
Prescaler
RF
IN
TEST
EM
SM
2
V
CCP
EM EA NR
12
REF Reference divider
IN
SA
2
EA
EA
PA NA
12
1/4
AUX Auxiliary divider
IN
Prescaler
SSA
.
SSA
.
DD
NM2
NM1 NM3 FMOD NF
12 8 3
Fractional Prescaler
accumulator modulus control
FRD
CN
8
Normal output
Main phase
charge pump
detector
CL
Main
2
reference
Speed-up
select
output
charge pump
CK
4
2 2 2
Integral output
charge pump
Auxiliary
reference
select
2
Auxiliary output
Auxiliary
charge pump
phase
detector
V V
DDA
Description
.
.
SSA
V
DD
FB
RF
RN
PHP
PHI
RA
PHA
LOCK
SSA