LMX2505 Datasheet

IC型號(hào)：
LMX2505
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PLLatinu Dual Frequency Synthesizer System with Integrated ...
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LMX2505 PLLatinum Dual Frequency Synthesizer System with Integrated VCOs

April 2004

LMX2505

PLLatinum

鈩?/div>

Dual Frequency Synthesizer System

with Integrated VCOs

General Description

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.

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.

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

MICROWIRE interface (DATA, LE, CLK).

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).

Features

Small Size

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

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

Supports Various Reference Frequencies

12.6/14.4/25.2/26.0 MHz

Fast Lock Time: 300 碌s

Low Current Consumption

10 mA at 2.8 V in PDC800 Mode

2.5 V to 3.3 V Operation

Digital Filtered Lock Detect Output

Hardware and Software Power Down Control

Applications

Japan PDC Systems at 800 MHz and 1500 MHz

Frequency Bands.

Functional Block Diagram

20067107

FastLock

鈩?/div>

is a trademark of National Semiconductor Corporation.

TRI-STATE

廬

is a registered trademark of National Semiconductor Corporation.

PLLatinum

鈩?/div>

is a trademark of National Semiconductor Corporation.

漏 2004 National Semiconductor Corporation

DS200671

www.national.com

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