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)


Application Notes (24)

Frequently Asked Questions (1)

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.

PCN-PDN Information

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