LMX2542数据手册集成电路（IC）的时钟发生器PLL频率合成器规格书PDF

描述 Description

General Description
LMX2542 is a highly integrated, high performance, low power frequency synthesizer system optimized for Cellular CDMA 1xRTT and IS-95 mobile handsets and data systems with GPS capabilities. Using a proprietary digital phase locked loop technique, LMX2542 provides very stable, low noise local oscillator (LO) signals for up and down conver sion in wireless communications devices

特性 Features

Small Size
    5.0 mm x 5.0 mm x 0.75 mm 28-Pin LLP
RF Synthesizer System
    Integrated RF VCO
    Integrated Loop Filter
    Low Spurious, Low Phase Noise Fractional-N RF
          PLL Based on 11-Bit ∆Σ modulator
    5 kHz Frequency Resolution
    Cellular-CDMA LO: 2105.28 MHz to 2155.14 MHz
    (Requires an External LO /2 Circuit)
    GPS LO: 2087.73 MHz
    (Requires an External LO /1.5 Circuit)
IF Synthesizer System
    Integer-N IF PLL
    Programmable Charge Pump Current Levels
    IF LO: 367.20 MHz
Supports Various Reference Oscillator Frequencies: 19.20 MHz/ 19.68 MHz
Low Current Consumption: 22 mA typical at 2.8V
2.7V to 3.3V Operation
RF Digital Filtered Lock Detect Output
Hardware and Software Powerdown ControlApplications
Cellular-CDMA 1xRTT and IS-95 Mobile Handsets with GPS
Cellular-CDMA 1xRTT and IS-95 Mobile Data Systems with GPS