1. Products
  2. Clock and Timing
  3. Clock Generation and Distribution
  4. Clock Generation Devices
  5. AD9540


Features and Benefits

  • Excellent intrinsic jitter performance
  • 200 MHz phase frequency detector inputs
  • 655 MHz programmable input dividers for the phase frequency detector (÷M, ÷N) {M, N = 1 to 16} (bypassable)
  • Programmable RF divider (÷R) {R = 1, 2, 4, 8} (bypassable)
  • 8 programmable phase/frequency profiles
  • 400 MSPS internal DDS clock speed
  • 48-bit frequency tuning word resolution
  • 14-bit programmable phase offset
  • 1.8 V supply for device operation
  • 3.3 V supply for I/O, CML driver, and charge pump output
  • Software controlled power-down
  • 48-lead LFCSP package
  • Programmable charge pump current (up to 4 mA)
  • Dual-mode PLL lock detect
  • 655 MHz CML-mode PECL-compliant output driver

Product Details

The AD9540 is Analog Devices’ first dedicated clocking product specifically designed to support the extremely stringent clocking requirements of the highest performance data converters. The device features high performance PLL (phase-locked loop) circuitry, including a flexible 200 MHz phase frequency detector and a digitally controlled charge pump current. The device also provides a low jitter, 655 MHz CML-mode, PECL-compliant output driver with programmable slew rates. External VCO rates up to 2.7 GHz are supported.

Extremely fine tuning resolution (steps less than 2.33 µHz) is another feature supported by this device. Information is loaded into the AD9540 via a serial I/O port that has a device write speed of 25 Mbps. The AD9540 frequency divider block can also be programmed to support a spread spectrum mode of operation.

The AD9540 is specified to operate over the extended automotive range of −40°C to +85°C.


  • Clocking high performance data converters
  • Base station clocking applications
  • Network (SONET/SDH) clocking
  • Gigabit Ethernet (GbE) clocking
  • Instrumentation clocking circuits
  • Agile LO frequency synthesis
  • Automotive radar
  • FM chirp source for radar and scanning systems
  • Test and measurement equipment
  • Acousto-optic device drivers

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Documentation & Resources

  • View All (54)
  • Data Sheets (1)
  • Application Notes (24)
  • Product Highlight (1)
  • Frequently Asked Questions (1)
  • Technical Articles (24)
  • Webcasts (3)
  • Application Notes
    Frequently Asked Questions
    Technical Articles

    Tools & Simulations

    Design Tools

    ADIsimCLK Design and Evaluation Software

    ADIsimCLK is the design tool developed specifically for Analog Devices' range of ultra-low jitter clock distribution and clock generation products. Whether your application is in wireless infrastructure, instrumentation, networking, broadband, ATE or other areas demanding predictable clock performance, ADIsimCLK will enable you to rapidly develop, evaluate and optimize your design.

    Product Recommendations

    AD9540 Companion Parts

    Recommended Reference Buffer

    Recommended Reference Clean Up PLL

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD9540BCPZ Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
    AD9540BCPZ-REEL7 Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
    Wafer Fabrication Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Sample & Buy

    Ordering FAQs

    See our Ordering FAQs for answers to questions about online orders, payment options and more.


    Buy Now Pricing

    (**) Displayed Buy Now Price and Price Range is based on small quantity orders.


    List Pricing

    (*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


    Lead Times

    Please see the latest communication from our CCO regarding lead times.



    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

    Price Table Help