Quad Input, 10-Output, Dual DPLL, 1 pps Synchronizer and Jitter Cleaner

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Product Details

The 10 clock outputs of the AD9544 are synchronized to any one of up to four input references. The digital phase-locked loops (DPLLs) reduce timing jitter associated with the external references. The digitally controlled loop and holdover circuitry continuously generate a low jitter output signal, even when all reference inputs fail.

The AD9544 is available in a 48-lead LFCSP (7 mm × 7 mm) package and operates over the −40°C to +85°C temperature range.

Note that throughout this data sheet, multifunction pins, such as SDO/M5, are referred to either by the entire pin name or by a single function of the pin, for example, M5, when only that function is relevant.


  • SyncE and GPS synchronization and jitter cleanup
  • Optical transport networks (OTN), SDH, and macro and small cell base stations
  • OTN mapping/demapping with jitter cleaning
  • Small base station clocking, including baseband and radio
  • Stratum 2, Stratum 3e, and Stratum 3 holdover, jitter cleanup, and phase transient control
  • JESD204B support for analog-to-digital converter (ADC) and digital-to-analog converter (DAC) clocking
  • Cable infrastructures
  • Carrier Ethernet

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


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EVAL-AD9544 Circuit Diagram

EVAL-AD9544 Photo

Product Details

The AD9544 evaluation board is a compact, easy-to-use platform for evaluating all features of the AD9544 dual digital PLL and 1 PPS synchronizer. The AD9544 provides high-precision, multi-output clock generator functions, along with two on-chip jitter cleaning digital PLL cores. PLL0 and PLL1 are optimized for high performance synchronous clocking applications such as IEEE 1588 Version 2, Synchronous Ethernet, OTN, and next generation wireless baseband protocols. The PLLs are fully configurable via serial port control as well as configurable via an external EEPROM for power on ready configurations.

The AD9544 can output up to 5 differential clock signals, plus two single-ended clocks driven by a mix of two high performance digital PLLs, plue two high-precision NCOs (numerically controlled oscillators). 12 total outputs and 4 reference inputs are accessible on the evaluation board.

The output differential transmission line pairs use 50Ω single ended characteristic impedance and are connected to standard edge launch SMA connectors. The AD9544/PCBZ has a fully configurable power supply to allow the user to evaluate the AD9544 while being powered directly by a step down switching regulator or external LDOs. The AD9544 evaluation board uses RoHS-compliant FR-4 material. For convenience, detailed information from the AD9544 data sheet has been included here. Use this user guide in conjunction with the datasheet that has been provided by ADI.

Tools & Simulations

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IBIS Models

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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.

AD9544 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints



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The USA 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. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.