Connection Diagrams

Pin Descriptions

Pin No.

Pin

Name

I/O

Description

TSSOP16

CSP16

21

V

P

—

Power supply for charge pump. Must be

≥ V

CC

32

CP

o

O

Internal charge pump output. For connection to a loop filter for driving the

voltage control input of an external oscillator.

4

3

GND

—

Ground.

54

f

INB

I

RF prescaler complimentary input. In single-ended mode, a bypass

capacitor should be placed as close as possible to this pin and be

connected directly to the ground plane. The LMX2324 can be driven

differentially when the bypass capacitor is omitted.

65

f

IN

I

RF prescaler input. Small signal input from the voltage controlled oscillator.

7

6

NC

No Connect

8

7

NC

No Connect

9

8

OSC

in

I

Oscillator input. A CMOS inverting gate input. The input has a V

threshold and can be driven from an external CMOS or TTL logic gate.

10

9

NC

No Connect

12

10

Clock

I

High impedance CMOS Clock input. Data is clocked in on the rising edge,

into the various counters and registers.

13

11

Data

I

Binary serial data input. Data entered MSB first. LSB is control bit. High

impedance CMOS input.

14

12

LE

I

Load Enable input. When Load Enable transitions HIGH, data is loaded

into either the N or R register (control bit dependent). See timing diagram.

15

13

NC

No Connect

11

14

NC

No Connect

16

15

CE

I

CHIP Enable. A LOW on CE powers down the device asynchronously and

116

V

CC

I

Power supply voltage input. Input may range from 2.7V to 5.5V. Bypass

capacitors should be placed as close as possible to this pin and be

connected directly to the ground plane.

TSSOP 16-Pin Package

DS101030-2

Order Number LMX2324TM, LM2324TMX

See NS Package Number MTC16

CSP 16-Pin Package

DS101030-3

Top View

Order Number LMX2324SLBX

See NS Package Number SLB16A

www.national.com

2