LMX2331L Datasheet

IC型號(hào)：
LMX2331L
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LMX2330L/LMX2331L/LMX2332L PLLatinum Low Power Dual Frequency Synthesizer for RF

Personal Communications

October 2001

LMX2330L/LMX2331L/LMX2332L

PLLatinum

鈩?/div>

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

transceiver. It is fabricated using National鈥檚 0.5碌 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,

provides 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 鈥?5.0 mA at 3V, LMX2331L 鈥?4.0 mA at 3V,

LMX2332L 鈥?3.0 mA at 3V.

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

24-pin surface mount plastic package, and thin CSP 20-pin

surface mount plastic package.

Features

Ultra low current consumption

2.7V to 5.5V operation

Selectable synchronous or asynchronous powerdown

mode:

= 1 碌A(chǔ) typical at 3V

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

Selectable charge pump TRI-STATE

廬

mode

Selectable charge pump current levels

Selectable Fastlock

鈩?/div>

mode

Upgrade and compatible to LMX233XA family

Applications

Portable Wireless Communications

(PCS/PCN, cordless)

Cordless and cellular telephone systems

Wireless Local Area Networks (WLANs)

Cable TV tuners (CATV)

Other wireless communication systems

Functional Block Diagram

01280601

漏 2001 National Semiconductor Corporation

DS012806

www.national.com

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