26.5 GHz, Integer N/Fractional-N, PLL Synthesizer

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Part Details
Part Models 2
1ku List Price Starting From $38.03
  • 1 GHz to 26.5 GHz bandwidth
  • Ultralow noise PLL
    • Integer N = −235 dBc/Hz, fractional-N = −231 dBc/Hz
  • High maximum PFD frequency
    • Integer N = 250 MHz, fractional-N = 125 MHz
  • 25-bit fixed/49-bit variable fractional modulus mode
  • Single-ended reference input
  • 3.3 V power supply, 3.3 V charge pump
  • Integrated 1.8 V logic capability
  • Phase resync
  • Programmable charge pump currents: 16× range
  • Digital lock detect
  • 3-wire serial interface with register readback option
  • Hardware and software power-down mode
  • Operating range from −40°C to +105°C
Additional Details
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The ADF41513 is an ultralow noise frequency synthesizer that can be used to implement local oscillators (LOs) as high as 26.5 GHz in the upconversion and downconversion sections of wireless receivers and transmitters.

The ADF41513 is designed on a high performance silicon geranium (SiGe), bipolar complementary metal-oxide semiconductor (BiCMOS) process, achieving a normalized phase noise floor of −235 dBc/Hz. The phase frequency detector (PFD) operates up to 250 MHz (integer N mode)/125 MHz (fractional-N mode) for improved phase noise and spur performance. The variable modulus, ∑-Δ modulator allows extremely fine resolution when using a 49-bit divide value. The ADF41513 can be used as an integer N phase-locked loop (PLL), or it can be used as a fractional-N PLL with either a fixed modulus for subhertz frequency resolution or variable modulus for subhertz exact frequency resolution.

A complete PLL is implemented when the synthesizer is used with an external loop filter and voltage controlled oscillator (VCO). The 26.5 GHz bandwidth eliminates the need for a frequency doubler or divider stage, simplifying system architecture and reducing cost. The ADF41513 is packaged in a compact, 24-lead, 4 mm × 4 mm LFCSP


  • Test equipment and instrumentation
  • Wireless infrastructure
  • Microwave point to point and multipoint radios
  • Very small aperture terminal (VSAT) radios
  • Aerospace and defense
Part Models 2
1ku List Price Starting From $38.03

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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ADF41513 Evaluation Board



ADF41513 Evaluation Board

ADF41513 Evaluation Board

Features and Benefits

  • EV-ADF41513SD1Z
    • ADF41513 frequency synthesizer, 100 MHz crystal oscillator, loop filter, USB interface, and voltage regulators
  • EV-ADF41513SD2Z
    • All features of EV-ADF41513SD1Z plus HMC733 10 GHz to 20 GHz VCO
  • EV-ADF41513SD3Z
    • All features of EV-ADF41513SD1Z plus ADF5709 9.85 GHz to 20.5 GHz VCO and LT3045/LT3042 voltage regulators
  • Windows-based software allows control of synthesizer functions from a PC
  • Externally powered by 6 V and 25 V

Product Detail

The EV-ADF41513SD1Z and EV-AD41513SD2Z are evaluation boards that can be used to evaluate all the features of the ADF41513. The EV-ADF41513SD1Z requires an external voltage controlled oscillator (VCO). The EV-ADF41513SD2Z includes an on-board 10 GHz to 20 GHz HMC733 VCO. The EV-ADF41513SD3Z instead includes the ADF5709 9.85GHz to 20.5GHz VCO and also has a reduced voltage regulator count.

EV-ADF41513SD1Z has Subminiature Version A (SMA) connectors to connect the charge pump output (VTUNE) to the tuning input of the VCO and the phase-locked loop (PLL) radio frequency (RF) input (RFIN) to the VCO output.

Both variants of the evaluation board include the ADF41513 frequency synthesizer, 100 MHz reference (crystal oscillator (XO)), loop filter, universal serial bus (USB) interface, low noise voltage regulators, and a USB cable to connect the board to a PC USB port

For easy programming of the synthesizer, download the Windows®-based software from the ADF41513 product page at The file transfer program (FTP) user name and password are printed on the label inside the lid of the evaluation board box.

The evaluation board requires a SDP-S (Figure 4), which is not included with the kit. The SDP-S allows software programming of the ADF41513 device through a USB interface. Consult the ADF41513 data sheet in conjunction with this user guide when working with the evaluation boards.

Tools & Simulations

Tools & Simulations 1

Reference Designs

Reference Designs 1

Figure 1. CN0568 Block Diagram

Fast switching, High Performance PLL and Quadband VCO Frequency Synthesizer

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Fast switching, High Performance PLL and Quadband VCO Frequency Synthesizer


Circuits from the lab

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Fast switching, High Performance PLL and Quadband VCO Frequency Synthesizer

Features and Benefits

  • 8GHz - 26GHz Frequency Operation
  • Quadband VCO provides Low Phase Noise over Wideband
  • Onboard Reference Clock for ease of Use
  • Arduino Form Factor Compatible
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Design & Integration Tools

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2.02 M


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Sep 02, 2022


Ultra-Fast Switching, High Performance PLL Frequency Synthesizer

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