Connection Diagram

28-Pin LLP (LQ) Package

20068002

NOTE: Analog ground connected through exposed die attached pad.

Pin Descriptions

Pin Number

Name

I/O

Description

1

CPout

O

IF PLL charge pump output

2

NC

–

Do not connect to any node on the printed circuit board.

3

NC

–

Do not connect to any node on the printed circuit board.

4V

DD

–

Supply voltage for IF analog circuitry

5

LE

I

MICROWIRE Latch Enable

6

CLK

I

MICROWIRE Clock

7

DATA

I

MICROWIRE Data

8V

DD

–

Supply voltage for VCO

9

NC

–

Do not connect to any node on the printed circuit board.

10

NC

–

Do not connect to any node on the printed circuit board.

11

NC

–

Do not connect to any node on the printed circuit board.

12

NC

–

Do not connect to any node on the printed circuit board.

13

V

DD

–

Supply voltage for VCO

14

V

DD

–

Supply voltage for VCO output buffer

15

RFout

O

Buffered VCO output

16

V

CC

–

Supply voltage for RF prescaler

17

V

CC

–

Supply voltage for charge pump

18

V

CC

–

Supply voltage for RF digital circuitry

19

LD

O

Lock Detect

20

CE

I

Chip Enable control pin

21

GND

–

Ground for digital circuitry

22

OSCin

I

Reference frequency input

23

V

CC

–

Supply voltage for reference input buffer

24

GND

–

Ground for digital circuitry

25

V

CC

–

Supply voltage for IF digital circuitry

26

Fin

I

IF buffer/prescaler input

27

V

CC

–

Supply voltage for IF buffer/prescaler

28

NC

–

Do not connect to any node on the printed circuit board.

www.national.com

2