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LMX2505LQ1321NATIONALN/a2000avaiDual Frequency Synthesizer System with Integrated VCOs
LMX2505LQX1321NSN/a1138avaiDual Frequency Synthesizer System with Integrated VCOs


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LMX2505LQ1321-LMX2505LQX1321
Dual Frequency Synthesizer System with Integrated VCOs
LMX2505
PLLatinum™ Dual Frequency Synthesizer System
with Integrated VCOs
General Description

LMX2505isa highly integrated, high performance, low
power frequency synthesizer system optimized for dual-
band Japan PDC mobile handsets. Usinga proprietary digi-
tal phase locked loop technique, LMX2505 generates very
stable, low noise local oscillator signalsforup and down
conversionin wireless communications devices.
LMX2505 includes dual voltage controlled oscillators (VCOs)
forthe upper and lower Japan PDC frequency bands,a loop
filter, anda fractional-N RF PLL basedona delta sigma
modulator.In concert these blocks forma closed loop RF
synthesizer system. The RF synthesizer system supports
two frequency bands: PDC1500 and PDC800.
Serial datais transferredto the device viaa three-wire
MICROWIRE interface (DATA, LE, CLK).
Operating supply voltage ranges from 2.5Vto 3.3V.
LMX2505 features low current consumption:10 mAat 2.8V
when operatinginthe PDC800 mode.
LMX2505is availableina 28-pin leadless leadframe pack-
age (LLP).
Features
Small Size
5.0 mmX 5.0 mmX 0.75 mm 28-Pin LLP Package RF Synthesizer System
Two Integrated VCOs
Integrated Loop Filter
Low Spurious, Low Phase Noise Fractional-NRF PLL
Basedon 10-Bit Delta Sigma Modulator
Frequency Resolution Downto20 kHz Supports Various Reference Frequencies
12.6/14.4/25.2/26.0 MHz Fast Lock Time: 300µs Low Current Consumption mAat2.8Vin PDC800 Mode 2.5Vto3.3V Operation Digital Filtered Lock Detect Output Hardware and Software Power Down Control
Applications
Japan PDC Systemsat 800 MHz and 1500 MHz
Frequency Bands.
Functional Block Diagram

April 2004
LMX2505
PLLatinum
Dual
Frequency
Synthesizer
System
with
Integrated
VCOs
ic,good price


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