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LMX2542LQX2121NSCN/a2241avaiPLLatinum Dual Frequency Synthesizer System with Integrated VCOs


LMX2542LQX2121 ,PLLatinum Dual Frequency Synthesizer System with Integrated VCOsFeaturesn Small SizeLMX2542 is a highly integrated, high performance, low5.0 mm x 5.0 mm x 0.75 mm ..
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LMX2542LQX2121
PLLatinum Dual Frequency Synthesizer System with Integrated VCOs
LMX2542
PLLatinum TM Cellular and GPS Frequency Synthesizer
System with Integrated VCO
General Description

LMX2542isa highly integrated, high performance, low
power frequency synthesizer system optimizedfor Cellular-
CDMA 1xRTT and IS-95 mobile handsets and data systems
with GPS capabilities. Usinga proprietary digital phase
locked loop technique, LMX2542 provides very stable, low
noise local oscillator (LO) signalsforup and down conver-
sionin wireless communications devices.
LMX2542 includesa Voltage Controlled Oscillator (VCO)for
both the Cellular-CDMA and GPS frequency bands,a loop
filter, anda Fractional-N RF PLL basedona Delta Sigma
(ΔΣ) modulator.In concert, these blocks forma closed loop synthesizer system. The RF synthesizer system oper-
ates from 2087.73 MHzto 2155.14 MHz.
LMX2542 includesan Integer-NIF PLL also. For more flex-
ible loop filter designs, theIF PLL includesa 4-level pro-
grammable charge pump. Together withan external VCO
and loop filter, LMX2542 makesa complete closed loopIF
synthesizer system. The defaultIF frequencyis 367.20 MHz.
Serial datais transferredto the device viaa three-wire
MICROWIRETM interface (DATA, LE, CLK).
Operating supply voltage ranges from 2.7Vto 3.3V.
LMX2542 features low current consumption:22 mAat 2.8V.
LMX2542is availableina 28-Pin Leadless Leadframe Pack-
age (LLP).
Features
Small Size
5.0 mmx5.0 mmx 0.75 mm 28-Pin LLP RF Synthesizer System
IntegratedRF VCO
Integrated Loop Filter
Low Spurious, Low Phase Noise Fractional-NRF
PLL Basedon 11-BitΔΣ modulator kHz Frequency Resolution
Cellular-CDMA LO: 2105.28 MHzto 2155.14 MHz
(Requiresan ExternalLO/2 Circuit)
GPS LO: 2087.73 MHz
(Requiresan ExternalLO /1.5 Circuit)IF Synthesizer System
Integer-NIF PLL
Programmable Charge Pump Current Levels LO: 367.20 MHz Supports Various Reference Oscillator Frequencies:
19.20 MHz/ 19.68 MHz Low Current Consumption: mA typicalat 2.8V 2.7Vto 3.3V Operation RF Digital Filtered Lock Detect Output Hardware and Software Powerdown Control
Applications
Cellular-CDMA 1xRTT and IS-95 Mobile Handsets with
GPS Cellular-CDMA 1xRTT and IS-95 Mobile Data Systems
with GPS
Leadless Leadframe Package (LQA28A)

May 2004
LMX2542
PLLatinum
Cellular
and
GPS
Frequency
Synthesizer
System
with
Integrated
VCOs
ic,good price


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