LMX2487E Delta-Sigma Low Power Dual PLL for RF Personal Communications | TIJ.co.jp

LMX2487E
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Delta-Sigma Low Power Dual PLL for RF Personal Communications

 

概要

The LMX2487E device is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. It is fabricated using TI’s 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 LMX2487E is highly resistant to changes in temperature and variations in wafer processing. The LMX2487E 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 LMX2487E is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2487E 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 LMX2487E is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.

特長

  • Quadruple Modulus Prescaler for Lower Divids
    • RF PLL: 16/17/20/21 or 32/33/36/37
    • IF PLL: 8/9 or 16/17
  • Advanced Delta Sigma Fractional Compensation
    • 12-Bit or 22-Bit Selectable Fractional Modulus
    • Up to 4th Order Programmable Delta-Sigma
      Modulator
  • Features for Improved Lock Time
    • Fastlock / Cycle Slip Reduction that Requires
      Single-Word Write
    • Integrated Time-Out Counter
  • Wide Operating Range
    • LMX2487E RF PLL: 3.0 GHz to 7.5 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-V to 3.6-V Operation With ICC = 8.5 mA
      at 3.0 V

Design with LMX2487E

Recommend Input Frequency Tunable Output Frequency
   
Input Frequency Min Output Frequency
 MHz  MHz
 
Max Output Frequency
 MHz
Channel Spacing
 MHz

機能一覧

他の製品と比較 RF PLL / シンセサイザ メール Excelへダウンロード
Part number オーダー・オプション Output frequency (Min) (MHz) Output frequency (Max) (MHz) Normalized PLL phase noise (dBc/Hz) 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) Current consumption (mA) VCC (V) Integrated VCO
LMX2487E ご注文 3000     7500     -210     -104     5.7     2.5 to 3.6     No    
LMX2485E ご注文 50     3000     -210     -104     3.3     2.5 to 3.6     No    
LMX2485Q-Q1 ご注文 500     3100     -210     -104     5     2.5 to 3.6     No    
LMX2486 サンプルは利用できません。 1000     4500     -210     -104     5.7     2.5 to 3.6     No    
LMX2487 サンプルは利用できません。 1000     6000     -210     -104     5.7     2.5 to 3.6     No