LMX2377UTM datasheet(1/44 Pages) NSC

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LMX2377U

PLLatinum™ Ultra Low Power Dual Frequency

Synthesizer for RF Personal Communications

2.5 GHz/1.2 GHz

General Description

The LMX2377U device is a high performance frequency

synthesizer with integrated dual modulus prescalers. The

LMX2377U device is designed for use as a local oscillator for

the first and second RF of a dual conversion radio trans-

ceiver.

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

Main synthesizer. An 8/9 or a 16/17 prescale ratio can be

selected for the Aux synthesizer. Using a proprietary digital

phase lock technique, the LMX2377U device generates very

stable, low noise control signals for UHF and VHF voltage

controlled oscillators. Both the Main and Aux synthesizers

include a two-level programmable charge pump. The Main

synthesizer has dedicated Fastlock circuitry.

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

interface (Data, LE, Clock). The low voltage logic interface

allows connection to 1.8V devices. Supply voltages from

2.7V to 5.5V are supported. The LMX2377U features ultra

low current consumption, typically 3.5 mA at 3.0V.

The LMX2377U devices are available in 20-Pin TSSOP,

24-Pin CSP, and 20-Pin UTCSP surface mount plastic pack-

ages.

Features

n

Ultra Low Current Consumption

n

Upgrade and Compatible to the LMX2370

n

2.7V to 5.5V Operation

n

1.8V to 5.0V MICROWIRE Logic Interface

n

Selectable Synchronous or Asynchronous Powerdown

Mode:

I

CC-PWDN = 1 µA typical

n

Selectable Dual Modulus Prescaler:

Main: 16/17 or 32/33

Aux: 8/9 or 16/17

n

Selectable Charge Pump TRI-STATE® Mode

n

Programmable Charge Pump Current Levels

Main and Aux: 0.95 or 3.8 mA

n

Selectable Fastlock™ Mode for the Main Synthesizer

n

Open Drain Analog Lock Detect Output

n

Available in 20-Pin TSSOP, 24-Pin CSP, and 20-Pin

UTCSP

Applications

n

Mobile Handsets

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

DCS)

n

Cordless Handsets

(DECT, DCT)

n

Wireless Data

n

Cable TV Tuners

Thin Shrink Small Outline Package

(MTC20)

Chip Scale Package (SLB24A)

Ultra Thin Chip Scale Package

(SLE20A)

20022680

20022681

20022695

PLLatinum™ is a trademark of National Semiconductor Corporation.

November 2002

DS200226

www.national.com

Số phần tương tự - LMX2377UTM

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