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LMX2525LQ1321
Dual Frequency Synthesizer System with Integrated VCOs
LMX2525
PLLatinum™ Dual Frequency Synthesizer System
with Integrated VCOs
General DescriptionLMX2525isa 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, LMX2525 generates very
stable, low noise local oscillator signalsforup and down
conversionin wireless communications devices.
LMX2525 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.
LMX2525 features low current consumption:10 mAat 2.8V
when operatinginthe PDC800 mode.
LMX2525is availableina 24-pin leadless leadframe pack-
age (LLP).
Features Small Size
5.0 mmX 4.0 mmX 0.75 mm 24-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 MHz, 14.4 MHz, 25.2MHz, and 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 DiagramApril 2004
LMX2525
PLLatinum
Dual
Frequency
Synthesizer
System
with
Integrated
VCOs
