500MHz to 14GHz Wideband, Low Noise Fractional N PLL With Ramp/Chirp Generation - LMX2492


500MHz to 14GHz Wideband, Low Noise Fractional N PLL With Ramp/Chirp Generation



The LMX2492/92-Q1 is a low noise 14 GHz wideband delta-sigma fractional N PLL with ramp and chirp generation. It consists of a phase frequency detector, programmable charge pump, and high frequency input for the external VCO. The LMX2492/92-Q1 supports a broad and flexible class of ramping capabilities, including FSK, PSK, and configurable piecewise linear FM modulation profiles of up to 8 segments. It supports fine PLL resolution and fast ramp with up to a 200 MHz phase detector rate. The LMX2492/92-Q1 allows any of its registers to be read back. The LMX2492/92-Q1 can operate with a single 3.3 V supply. Moreover, supporting up to 5.25 V charge pump can eliminate the need of external amplifier, leading to a simpler solution with improved phase noise performance.


  • –227 dBc/Hz Normalized PLL Noise
  • 500 MHz – 14 GHz Wideband PLL
  • 3.15 – 5.25 V Charge Pump PLL Supply
  • Versatile Ramp / Chirp Generation
  • 200 MHz Max Phase Detector Frequency
  • FSK / PSK Modulation Pin
  • Digital Lock Detect
  • Single 3.3 V Supply Capability
  • Automotive 125°C Q100 Grade 1 Qualification
  • Non-Automotive (LMX2492) Option

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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
LMX2492 LMX2485E LMX2491 LMX2582 LMX2592 LMX2594 LMX2595
500    50      20    20    10     
14000    3000      5500    9800    15000     
-227    -210    -227    -231    -231    -236    -236   
      -129    -129       
-120    -104    -120    -126    -126    -129    -129   
60    3.3    60    250    250    340 mA    340   
3.15 to 3.45    2.5 to 3.6    3.15 to 3.45    3.15 to 3.45    3.15 to 3.45    3.3     
No    No    No    Yes    Yes    Yes    Yes   
24WQFN    24WQFN    24WQFN    40VQFN    40VQFN    40VQFN    40VQFN   

Other qualified versions of LMX2492

Version Part Number Definition
Automotive LMX2492-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

Featured tools and software

WEBENCH® Designer LMX2492

Recommend Input Frequency Tunable Output Frequency
Input Frequency Min Output Frequency
 MHz  MHz
Max Output Frequency
Channel Spacing