LMX2332LSLB datasheet(1/21 Pages) NSC

No de pièce	LMX2332LSLB

Description	PLLatinum??Low Power Dual Frequency Synthesizer for RF Personal Communications

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Fabricant	NSC [National Semiconductor (TI)]

Site Internet	http://www.national.com

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LMX2330L/LMX2331L/LMX2332L

PLLatinum™ Low Power Dual Frequency Synthesizer for

RF Personal Communications

LMX2330L

2.5 GHz/510 MHz

LMX2331L

2.0 GHz/510 MHz

LMX2332L

1.2 GHz/510 MHz

General Description

The LMX233XL family of monolithic, integrated dual fre-

quency synthesizers, including prescalers, is to be used as a

local oscillator for RF and first IF of a dual conversion trans-

ceiver. It is fabricated using National’s 0.5µ ABiC V silicon

BiCMOS process.

The LMX233XL contains dual modulus prescalers. A 64/65

or a 128/129 prescaler (32/33 or 64/65 in the 2.5 GHz

LMX2330L) can be selected for the RF synthesizer and a 8/9

or a 16/17 prescaler can be selected for the IF synthesizer.

LMX233XL, which employs a digital phase locked loop tech-

nique, combined with a high quality reference oscillator, pro-

vides the tuning voltages for voltage controlled oscillators to

generate very stable, low noise signals for RF and IF local

oscillators. Serial data is transferred into the LMX233XL via

a three wire interface (Data, Enable, Clock). Supply voltage

can range from 2.7V to 5.5V. The LMX233XL family features

very low current consumption;

LMX2330L — 5.0 mA at 3V, LMX2331L — 4.0 mA at 3V,

LMX2332L — 3.0 mA at 3V.

The LMX233XL are available in a TSSOP 20-pin and CSP

24-pin surface mount plastic package.

Features

n Ultra low current consumption

n 2.7V to 5.5V operation

n Selectable synchronous or asynchronous powerdown

mode:

I

CC = 1 µA typical at 3V

n Dual modulus prescaler:

LMX2330L

(RF) 32/33 or 64/65

LMX2331L/32L

(RF) 64/65 or 128/129

LMX2330L/31L/32L

(IF) 8/9 or 16/17

n Selectable charge pump TRI-STATE® mode

n Selectable charge pump current levels

n Selectable Fastlock™ mode

n Upgrade and compatible to LMX233XA family

Applications

n Portable Wireless Communications

(PCS/PCN, cordless)

n Cordless and cellular telephone systems

n Wireless Local Area Networks (WLANs)

n Cable TV tuners (CATV)

n Other wireless communication systems

Functional Block Diagram

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

Fastlock™, MICROWIRE™ and PLLatinum™ are trademarks of National Semiconductor Corporation.

DS012806-1

June 1999

DS012806

www.national.com

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