LMX2502 Frequency Synthesizer System with Integrated VCOs | TI.com

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
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.


  • 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

All trademarks are the property of their respective owners.


Compare all products in RF PLLs & synthesizers Email Download to Excel
Part number Order Output frequency (Min) (MHz) Output frequency (Max) (MHz) Normalized PLL phase noise (dBc/Hz) Current consumption (mA) VCC (V) Integrated VCO
LMX2502 Order now 1619.62     1649.62     -138     17     2.7 to 3.3     Yes