LMX2331A datasheet(1/17 Pages) NSC

Part #	LMX2331A

Description	PLLatinum??Dual Frequency Synthesizer for RF Personal Communications

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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LMX2330A/LMX2331A/LMX2332A

PLLatinum™ Dual Frequency Synthesizer for RF

Personal Communications

LMX2330A

2.5 GHz/510 MHz

LMX2331A

2.0 GHz/510 MHz

LMX2332A

1.2 GHz/510 MHz

General Description

The LMX233xA 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 ABiC IV silicon

BiCMOS process.

The LMX233xA contains dual modulus prescalers. A 64/65

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

LMX2330A) can be selected for the RF synthesizer and a

8/9 or a 16/17 prescaler can be selected for the IF synthe-

sizer. LMX233XA, which employs a digital phase locked loop

technique, combined with a high quality reference oscillator

and loop filters, provides the tuning voltages for voltage con-

trolled oscillators to generate very stable low noise RF and

IF local oscillator signals. Serial data is transferred into the

LMX233xA via a three wire interface (Data, Enable, Clock).

Supply voltage can range from 2.7V to 5.5V. The LMX233xA

family

features

very

low

current

consumption;

LMX2330A — 13 mA at 3V, LMX2331A — 12 mA at 3V,

LMX2332A — 8 mA at 3V.

The LMX233xA are available in a TSSOP 20-pin surface

mount plastic package.

Features

n 2.7V to 5.5V operation

n Low current consumption

n Selectable powerdown mode: ICC = 1 µA typical at 3V

n Dual modulus prescaler:

LMX2330A (RF) 32/33 or 64/65

LMX2331A/32A (RF) 64/65 or 128/129

LMX2330A/31A/32A (IF) 8/9 or 16/17

n Selectable charge pump TRI-STATE® mode

n Selectable FastLock™ mode

n Small outline, plastic, surface mount TSSOP 0.173"

wide package

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.

DS012331-1

May 1999

DS012331

www.national.com

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LMX2331A Datasheet(PDF) 1 Page - National Semiconductor (TI)

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