LMX2485SQX /NOPB by Texas Instruments | APACRF PLLs | Avnet ASIA
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信息

LMX2485SQX /NOPB

Texas Instruments

PLL Frequency Synthesizer Dual 75MHz to 3000MHz 24-Pin LLP EP T/R

製造商產品編號: LMX2485SQX /NOPB

替代料號: LMX2485SQX/NOPB


通過RoHS認證

描述

文檔

替代/替換

資料

The LMX2485 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device is fabricated using Texas Instruments' advanced process.

With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. Unlike analog compensation, the digital feedback technique used in the LMX2485 is highly resistant to changes in temperature and variations in wafer processing. The LMX2485 delta-sigma modulator is programmable up to fourth order, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.

Serial data for programming the LMX2485 is transferred via a three line high speed (20 MHz) MICROWIRE interface. The LMX2485 offers fine frequency resolution, low spurs, fast programming speed, and a single word write to change the frequency. This makes it ideal for direct digital modulation applications, where the N counter is directly modulated with information. The LMX2485 is available in a 24 lead 4.0 X 4.0 X 0.8 mm WQFN package.

技術參數

  • Quadruple Modulus Prescalers for Lower Divide Ratios
    • RF PLL: 8/9/12/13 or 16/17/20/21
    • IF PLL: 8/9 or 16/17
  • Advanced DeltaSigma Fractional Compensation
    • 12 bit or 22 Bit Selectable Fractional Modulus
    • Up to 4th Order Programmable Delta-Sigma Modulator
  • Features for Improved Lock Times and Programming
    • Fastlock / Cycle Slip Reduction
    • Integrated Time-Out Counter
    • Single Word Write to Change Frequencies with Fastlock
  • Wide Operating Range
    • LMX2485 RF PLL: 500 MHz to 3.0 GHz
    • LMX2485E RF PLL: 50 MHz to 3.0 GHz
  • Useful Features
    • Digital Lock Detect Output
    • Hardware and Software Power-Down Control
    • On-Chip Crystal Reference Frequency Doubler.
    • RF Phase Comparison Frequency up to 50 MHz
    • 2.5 to 3.6 Volt Operation with ICC = 5.0 mA at 3.0 V
  • 技術屬性

    描述
    尋找類似物料
    Supplier Package
    LLP EP
    Number of Elements per Chip
    2
    Operating Temperature
    -40 to 85 °C
    Pin Count
    24
    Max Processing Temp
    260
    Type
    PLL Frequency Synthesizer
    Mounting
    Surface Mount
    Maximum Input Frequency
    3000 MHz
    MSL Level
    3
    Operating Supply Voltage
    3 V
    Minimum Input Frequency
    75 MHz
    Lead Finish
    Matte Tin
    Product Dimensions
    4 x 4 x 0.8 mm

    ECCN/UNSPSC

    描述
    ECCN:
    5A991.g
    計劃交貨期 B:
    8542390000"
    UNSPSC:
    32101600
    UNSPSC VERSION:
    V15.1101
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