Datasheet > LMX2505

LMX2505

更新时间： 2024-11-20 22:46:59

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
16页	229K
描述
PLLatinu Dual Frequency Synthesizer System with Integrated VCOs

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LMX2505 数据手册

April 2004

LMX2505

™

PLLatinum Dual Frequency Synthesizer System

with Integrated VCOs

General Description

Features

n Small Size

LMX2505 is a highly integrated, high performance, low

power frequency synthesizer system optimized for dual-

band Japan PDC mobile handsets. Using a proprietary digi-

tal phase locked loop technique, LMX2505 generates very

stable, low noise local oscillator signals for up and down

conversion in wireless communications devices.

5.0 mm X 5.0 mm X 0.75 mm 28-Pin LLP Package

n RF Synthesizer System

Two Integrated VCOs

Integrated Loop Filter

Low Spurious, Low Phase Noise Fractional-N RF PLL

Based on 10-Bit Delta Sigma Modulator

Frequency Resolution Down to 20 kHz

n Supports Various Reference Frequencies

12.6/14.4/25.2/26.0 MHz

n Fast Lock Time: 300 µs

n Low Current Consumption

LMX2505 includes dual voltage controlled oscillators (VCOs)

for the upper and lower Japan PDC frequency bands, a loop

filter, and a fractional-N RF PLL based on a delta sigma

modulator. In concert these blocks form a closed loop RF

synthesizer system. The RF synthesizer system supports

two frequency bands: PDC1500 and PDC800.

10 mA at 2.8 V in PDC800 Mode

n 2.5 V to 3.3 V Operation

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

MICROWIRE interface (DATA, LE, CLK).

n Digital Filtered Lock Detect Output

n Hardware and Software Power Down Control

Operating supply voltage ranges from 2.5 V to 3.3 V.

LMX2505 features low current consumption: 10 mA at 2.8 V

when operating in the PDC800 mode.

LMX2505 is available in a 28-pin leadless leadframe pack-

age (LLP).

Applications

n Japan PDC Systems at 800 MHz and 1500 MHz

Frequency Bands.

Functional Block Diagram

20067107

™

FastLock is a trademark of National Semiconductor Corporation.

TRI-STATE^®is a registered trademark of National Semiconductor Corporation.

™

PLLatinum is a trademark of National Semiconductor Corporation.

DS200671

www.national.com

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