300M-4800MHz Low Noise Integer-N/Fractional-N PLL with Integrated VCO and up to 8 Outputs



The TRF3765 is a wideband Integer-N/Fractional-N frequency synthesizer with an integrated, wideband voltage-controlled oscillator (VCO). Programmable output dividers enable continuous frequency coverage from 300 MHz to 4.8 GHz. Four separate differential, open-collector RF outputs allow multiple devices to be driven in parallel without the need of external splitters.

The TRF3765 also accepts external VCO input signals and allows on/off control through a programmable control output. For maximum flexibility and wide reference frequency range, wide-range divide ratio settings are programmable and an off-chip loop filter can be used.

The TRF3765 is available in an RHB-32 QFN package.


  • Output Frequencies: 300 MHz to 4.8 GHz
  • Low-Noise VCO: –133 dBc/Hz
    (1-MHz Offset, fOUT = 2.65 GHz)
  • 13-/16-Bit Reference/Feedback Divider
  • 25-Bit Fractional-N and Integer-N PLL
  • Low RMS Jitter: 0.35 ps
  • Input Reference Frequency Range:
    0.5 MHz to 350 MHz
  • Programmable Output Divide-by-1/-2/-4/-8
  • Four Differential LO Outputs
  • External VCO Input with Programmable VCO
    On/Off Control

View more

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
TRF3765 LMX2581
300    50   
4800    3760   
-221    -229   
-133    -121   
-106    -125   
115    178   
3.3    3.15 to 3.45   
Yes    Yes   
32VQFN    32WQFN