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LMX2485Q-Q1 Datasheet PDF - Texas Instruments

Part NameDescriptionManufacturer
LMX2485Q-Q1 500 MHz - 3.1 GHz High Performance Delta-Sigma Low Power Dual PLLatinum™ Frequency Synthesizers With 800-MHz Integer PLL TI
Texas Instruments TI
Other PDF  no available.
LMX2485Q-Q1 Datasheet PDF : LMX2485Q-Q1 pdf   
LMX2485Q-Q1 image

Description
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.

Features
• 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 Modulator
• 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

Applications
• Cellular Phones and Base Stations
• Direct Digital Modulation Applications
• Satellite and Cable TV Tuners
• WLAN Standards

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