lmx2525 National Semiconductor Corporation, lmx2525 Datasheet

lmx2525

Manufacturer Part Number

lmx2525

Description

Pllatinum Dual Frequency Synthesizer System With Integrated Vcos

Manufacturer

National Semiconductor Corporation

Datasheet

1.LMX2525.pdf (17 pages)

Current page: 1 of 17
Download datasheet (223Kb)

LMX2525

PLLatinum

with Integrated VCOs

General Description

LMX2525 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, LMX2525 generates very

stable, low noise local oscillator signals for up and down

conversion in wireless communications devices.

LMX2525 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.

LMX2525 features low current consumption: 10 mA at 2.8 V

when operating in the PDC800 mode.

LMX2525 is available in a 24-pin leadless leadframe pack-

age (LLP).

Functional Block Diagram

FastLock

TRI-STATE

PLLatinum

™

is a trademark of National Semiconductor Corporation.

is a registered trademark of National Semiconductor Corporation.

is a trademark of National Semiconductor Corporation.

™

Dual Frequency Synthesizer System

DS200689

Features

n Small Size

n RF Synthesizer System

n Supports Various Reference Frequencies

n Fast Lock Time: 300 µs

n Low Current Consumption

n 2.5 V to 3.3 V Operation

n Digital Filtered Lock Detect Output

n Hardware and Software Power Down Control

Applications

n Japan PDC Systems at 800 MHz and 1500 MHz

Frequency Bands.

5.0 mm X 4.0 mm X 0.75 mm 24-Pin LLP Package

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

12.6 MHz, 14.4 MHz, 25.2MHz, and 26.0 MHz

10 mA at 2.8 V in PDC800 Mode

20068907

www.national.com

April 2004

Related parts for lmx2525

Related keywords

lmx2525 datasheet
lmx2525 data sheet
lmx2525 pdf datasheet
lmx2525 component
lmx2525 part
lmx2525 distributor
lmx2525 RoHS
lmx2525 datasheet download