LMX2433TM National Semiconductor, LMX2433TM Datasheet

LMX2433TM

Manufacturer Part Number

LMX2433TM

Description

PLLatinum Dual High Frequency Synthesizer for RF Personal Communications

Manufacturer

National Semiconductor

Datasheets

1.LMX2430.pdf (49 pages)

2.LMX2433TM.pdf (49 pages)

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LMX2430/LMX2433/LMX2434

PLLatinum

Personal Communications

LMX2430 3.0 GHz/0.8 GHz

LMX2433 3.6 GHz/1.7 GHz

LMX2434 5.0 GHz/2.5 GHz

General Description

The LMX243x devices are high performance frequency syn-

thesizers with integrated dual modulus prescalers. The

LMX243x devices are designed for use as RF and IF local

oscillators for dual conversion radio transceivers.

A 32/33 or a 16/17 prescale ratio can be selected for the 5.0

GHz LMX2434 RF synthesizer. An 8/9 or a 16/17 prescale

ratio can be selected for both the LMX2430 and LMX2433

RF synthesizers. The IF circuitry contains an 8/9 or a 16/17

prescaler. Using a proprietary digital phase locked loop tech-

nique, the LMX243x devices generate very stable, low noise

control signals for RF and IF voltage controlled oscillators.

Both the RF and IF synthesizers include a two-level pro-

grammable charge pump. Both the RF and IF synthesizers

have dedicated Fastlock circuitry with integrated timeout

counters. Furthermore, only a single word write is required to

power up and tune the synthesizers to a new frequency.

Serial data is transferred to the devices via a three-wire

interface (DATA, LE, CLK). A low voltage logic interface

allows direct connection to 1.8V devices. Supply voltages

from 2.25V to 2.75V are supported . The LMX243x family

features low current consumption:

LMX2430 (3.0 GHz/ 0.8 GHz) — 2.8 mA/ 1.4 mA, LMX2433

(3.6 GHz/ 1.7 GHz) — 3.2 mA/ 2.0 mA, LMX2434 (5.0 GHz/

2.5 GHz) — 4.6 mA/ 2.4 mA at 2.50V.

The LMX243x devices are available in 20-Pin TSSOP and

20-Pin UTCSP surface mount plastic packages.

PLLatinum

Thin Shrink Small Outline Package (MTC20)

™

is a trademark of National Semiconductor Corporation.

™

Dual High Frequency Synthesizer for RF

DS200535

20053580

Features

n Low Current Consumption

n 2.25V to 2.75V Operation

n Selectable Synchronous or Asynchronous Powerdown

n Selectable Dual Modulus Prescaler:

n Programmable Charge Pump Current Levels

n Fastlock

n Digital Filtered Lock Detect Output

n Analog Lock Detect Output (supports both Push-Pull

n 1.8V MICROWIRE Logic Interface

n Available in 20-Pin TSSOP and 20-Pin UTCSP

Applications

n Mobile Handsets

n Cordless Handsets

n Wireless Data

n Cable TV Tuners

Mode

and Open Drain configurations)

RF and IF: 1 or 4 mA

(GSM, GPRS, W-CDMA, CDMA, PCS, AMPS, PDC,

DCS)

(DECT, DCT)

LMX2430

LMX2433

LMX2434

LMX243x

Ultra Thin Chip Scale Package (SLE20A)

™

Technology with Integrated Timeout Counters

IF: 8/9 or 16/17

RF: 8/9 or 16/17

RF: 16/17 or 32/33

20053581

www.national.com

May 2003

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