Kenwood TK-480 User Manual

TK-480/481

■ Block diagram

■ Pin description

1

CLOCK

Serial clock input.

2

DATA

Serial data input.

3

STROBE

Serial strobe input.

4

V

SS

Digital ground.

5

RF

IN

Prescaler positive input.

6

RF

IN

Prescaler negative input.

7

V

CCP

Prescaler positive supply voltage. This pin supplies power to the prescaler and RF input buffer.

8

REF

IN

Reference divider input.

9

RA

Auxiliary current setting; resistor to V

SSA

.

10

AUX

IN

Auxiliary divider input.

11

PHA

Auxiliary phase detector output.

12

V

SSA

analog ground.

13

PHI

Integral phase detector output.

14

PHP

Proportional phase detector output.

15

V

DDA

Analog supply voltage. This pin supplies power to the charge pumps, Auxiliary prescaler, Auxiliary and Reference buffers.

16

RN

Main current setting; resistor to V

SSA

.

17

RF

Fractional compensation current setting; resistor to V

SSA

.

18

LOCK

Lock detector output.

19

TEST

Test pin; connect to V

DD

.

20

V

DD

Digital supply voltage. This pin supplies power to the CMOS digital part of the device.

CLOCK

DATA

STROBE

64/65/72
Prescaler

Main dividers

PR

NM1

NM2
NM3

12

8

2

2

FB

EM

Fractional

accumulator

FMOD

NF

3

Prescaler

modulus control

FB

Main phase

detector

Normal output

charge pump

Reference divider

÷

2

÷

2

÷

2

Main

reference

select

EM

EM

÷

EA

NR

12

SM

2

Auxiliary

reference

select

SA

2

Auxiliary

phase

detector

EA

EA

1/4

Prescaler

Auxiliary divider

PA

NA

12

Auxiliary output

charge pump

Integral output

charge pump

Speed-up

output

charge pump

2

FRD

CN

8

CL

2

CK

4

Serial input + Program latches

RF

IN

RF

IN

TEST

Vss

REF

IN

V

CCP

AUX

IN

V

DDA

V

SSA

V

DD

RF

RN

PHP

PHI

RA

PHA

LOCK