Product details


Integrated VCO Yes Output frequency (Min) (MHz) 1619.62 Output frequency (Max) (MHz) 1649.62 Normalized PLL phase noise (dBc/Hz) -138 Current consumption (mA) 17 open-in-new Find other RF PLLs & synthesizers

Package | Pins | Size

WQFN (NJB) 28 25 mm² 5 x 5 open-in-new Find other RF PLLs & synthesizers


  • 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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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.

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Technical documentation

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* Data sheet LMX2502/LMX2512 PLLatinum Frequency Synthesizer System with Integrated VCO datasheet (Rev. C) Apr. 13, 2013

Design & development

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Software development

CodeLoader Software for device register programming
CODELOADER The CodeLoader 4 software is used to program the LMX PLLs and LMK timing devices through either the USB or line print terminal (LPT) port of a computer. This software also provides information on how to program the device by showing the bits that are actually sent.

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WQFN (NJB) 28 View options

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