LMX233XA Datasheet

IC型號(hào)：
LMX233XA
PDF描述：
PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Commu...
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PDF頁數(shù)：
17頁
芯片廠家：
NSC

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LMX2330A/LMX2331A/LMX2332A PLLatinum Dual Frequency Synthesizer for RF Personal

Communications

May 1999

LMX2330A/LMX2331A/LMX2332A

PLLatinum

鈩?/div>

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鈥檚 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 鈥?13 mA at 3V, LMX2331A 鈥?12 mA at 3V,

LMX2332A 鈥?8 mA at 3V.

The LMX233xA are available in a TSSOP 20-pin surface

mount plastic package.

Features

2.7V to 5.5V operation

Low current consumption

Selectable powerdown mode: I

= 1 碌A(chǔ) typical at 3V

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

Selectable charge pump TRI-STATE

廬

mode

Selectable FastLock

鈩?/div>

mode

Small outline, plastic, surface mount TSSOP 0.173"

wide package

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

DS012331-1

TRI-STATE

廬

is a registered trademark of National Semiconductor Corporation.

Fastlock

鈩?/div>

, MICROWIRE

鈩?/div>

and PLLatinum

鈩?/div>

are trademarks of National Semiconductor Corporation.

漏 1999 National Semiconductor Corporation

DS012331

www.national.com

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