LMX2502 - Frequency Synthesizer System with Integrated VCOs

LMX2502 and LMX2512 are highly integrated, high performance, low power frequency synthesizer systems optimized for Korean PCS and Korean Cellular CDMA (1xRTT, IS-95) mobile handsets. Using a proprietary digital phase locked loop technique, LMX2502 and LMX2512 generate very stable, low noise local oscillator signals for up and down conversion in wireless communications devices.

LMX2502 and LMX2512 include a voltage controlled oscillator (VCO), a loop filter, and a fractional-N RF PLL based on a delta sigma modulator. In concert these blocks form a closed loop RF synthesizer system. LMX2502 supports the Korean PCS band and LMX2512 supports the Korean Cellular band.

LMX2502 and LMX2512 include an Integer-N IF PLL also. For more flexible loop filter designs, the IF PLL includes a 4-level programmable charge pump. Together with an external VCO and loop filter, LMX2502 and LMX2512 make a complete closed loop IF synthesizer system.

Serial data is transferred to the device via a three-wire MICROWIRE interface (DATA, LE, CLK).

Operating supply voltage ranges from 2.7 V to 3.3 V. LMX2502 and LMX2512 feature low current consumption: 17 mA at 2.8 V.

LMX2502 and LMX2512 are available in a 28-pin WQFN package.

Products containing the "LMX2502" keyword are: LMX25021635EVAL/NOPB , LMX2502LQ-1635 , LMX2502LQ1 , LMX2502LQ1635 , LMX2502LQ1635 , LMX2502LQ1635 NOPB , LMX2502LQ1635/NOPB , LMX2502LQ1635/NOPB , LMX2502LQ1635/S7001911 , LMX2502LQX1635

• Small Size
  • 5.0 mm X 5.0 mm X 0.75 mm 28-Pin WQFN Package
• RF Synthesizer System
  • Integrated RF VCO
  • Integrated Loop Filter
  • Low Spurious, Low Phase Noise Fractional-N RF PLL Based on 11-Bit Delta Sigma Modulator
  • 10 kHz Frequency Resolution
• IF Synthesizer System
  • Integer-N IF PLL
  • Programmable Charge Pump Current Levels
  • Programmable Frequency
• Supports Various Reference Frequencies
  • 19.20/19.68 MHz
• Fast Lock Time: 500 µs
• Low Current Consumption
  • 17 mA at 2.8 V
• 2.7 V to 3.3 V Operation
• Digital Filtered Lock Detect Output
• Hardware and Software Power Down Control

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