High Performance, Wideband PLLatinum RF Synthesizer  - LMX2582


High Performance, Wideband PLLatinum RF Synthesizer



The LMX2582 device is a low-noise, wideband RF PLL with integrated VCO that supports a frequency range from 20 MHz to 5.5 GHz. The device supports both fractional-N and integer-N modes, with a 32-bit fractional divider allowing fine frequency selection. Integrated noise of 47 fs for 1.8-GHz output makes it an ideal low-noise source. Combining best-in-class PLL and integrated VCO noise with integrated LDOs, this device removes the need for multiple discrete devices in high performance systems.

The device accepts input frequencies up to 1.4 GHz, which combined with frequency dividers and programmable low noise multiplier allows flexible frequency planning. The additional programmable low-noise multiplier lets users mitigate the impact of integer boundary spurs. In Fractional-N mode, the device can adjust the output phase by a 32-bit resolution. For applications that need fast frequency changes, the device supports a fast calibration option which takes less than 25 µs.

This performance is achieved by using single 3.3-V supply. It supports 2 flexible differential outputs that can be configured as single-ended outputs as well. Users can choose to program one output from the VCO and the second from the channel divider. When not being used, each output can be muted separately.


  • Output Frequency Range from 20 to 5500 MHz
  • Industry Leading Phase Noise Performance
    • VCO Phase Noise: –144.5 dBc/Hz at 1-MHz Offset for 1.8-GHz Output
    • Normalized PLL Noise Floor: –231 dBc/Hz
    • Normalized PLL Flicker Noise: –126 dBc/Hz
    • 47-fs RMS Jitter (12 kHz to 20 MHz) for 1.8 GHz Output
  • Input Clock Frequency Up to 1400 MHz
  • Phase Detector Frequency Up to 200 MHz,
    and Up to 400 MHz in Integer-N Mode
  • Supports Fractional-N and Integer-N Modes
  • Dual Differential Outputs
  • Innovative Solution to Reduce Spurs
  • Programmable Phase Adjustment
  • Programmable Charge Pump Current
  • Programmable Output Power Level
  • SPI or uWire (4-Wire Serial Interface)
  • Single Power Supply Operation: 3.3 V

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Parametrics Compare all products in RF PLLs and Synthesizers

Output Frequency (Min) (MHz)
Output Frequency (Max) (MHz)
Normalized PLL Phase Noise (dBc/Hz)
VCO Phase Noise (Nom) (dBc/Hz)
1/f Noise (10 kHz offset at 1 GHz carrier) (dBc/Hz)
Current Consumption (mA)
Integrated VCO
LMX2582 LMX2492 LMX2571 LMX2581 LMX2581E LMX2592 LMX2594 LMX2595
20    500    10    50    50    20    10     
5500    14000    1344    3760    3800    9800    15000     
-231    -227    -231    -229    -229    -231    -236    -236   
-129      -115    -121    -121    -129       
-126    -120    -124    -125    -125    -126    -129    -129   
250    60    39    178    178    250    340 mA    340   
3.15 to 3.45    3.15 to 3.45    3.15 to 5    3.15 to 3.45    3.15 to 3.45    3.15 to 3.45    3.3     
Yes    No    Yes    Yes    Yes    Yes    Yes    Yes   
40VQFN    24WQFN      32WQFN    32WQFN    40VQFN    40VQFN    40VQFN