LMX2485Q-Q1 オートモーティブ 、デルタ・シグマ、低消費電力 2 回路PLL、RF パーソナル通信用 | TIJ.co.jp

この製品はすでに市場にリリースされており、ご購入できます。 一部の製品は、より新しい代替品を使用できる可能性があります。
オートモーティブ 、デルタ・シグマ、低消費電力 2 回路PLL、RF パーソナル通信用



  • LMX2485  -  3.0 GHz の最大動作周波数


The LMX2485Q-Q1 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device 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 LMX2485Q-Q1 is highly resistant to changes in temperature and variations in wafer processing. The LMX2485Q-Q1 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 LMX2485Q-Q1 is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2485Q-Q1 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 LMX2485Q-Q1 is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.


  • Quadruple Modulus Prescaler for Lower Divides
    • RF PLL: 8/9/12/13 or 16/17/20/21
    • 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
  • Improved Lock Times and Programming
    • Fastlock / Cycle Slip Reduction Requiring Only
      a Single-Word Write
    • Integrated Time-Out Counter
  • Wide Operating Range
    • LMX2485Q-Q1 RF PLL: 500 MHz to 3.1 GHz
  • Useful Features
    • Digital Lock Detect Output
    • Hardware and Software Power-Down Control
    • On-Chip Input Frequency Doubler
    • RF Phase Detector Frequency Up to 50 MHz
    • 2.5-V to 3.6-V Operation With ICC = 5.0 mA
    • LMX2485Q-Q1 is AEC-Q100 Grade 2
      Qualified and is Manufactured on an
      Automotive Grade Flow


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
LMX2485Q-Q1 ご注文 500     3100     -210     -104     5     2.5 to 3.6     No    
LMX2485E ご注文 50     3000     -210     -104     3.3     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    
LMX2487E サンプルは利用できません。 3000     7500     -210     -104     5.7     2.5 to 3.6     No    
LMX2492-Q1 ご注文 500     14000     -227     -120     60     3.15 to 3.45     No