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AD9557:  Dual-Input Multiservice Line Card Adaptive Clock Translator

Product Details

Product Status:Recommended for New Designs

The AD9557 is a low loop bandwidth clock multiplier that provides jitter cleanup and synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9557 generates an output clock synchronized to one or two external input references. The digital PLL allows for reduction of input time jitter or phase noise associated with the external references. The digitally controlled loop and holdover circuitry of the AD9557 continuously generates a low jitter output clock even when all reference inputs have failed.

The AD9557 operates over an industrial temperature range of −40°C to +85°C.


  • Network synchronization including synchronous Ethernet and SDH to OTN mapping / demapping
  • Cleanup of reference clock jitter
  • SONET/SDH clocks up to OC-192, including FEC
  • Stratum 3 holdover, jitter cleanup, and phase transient control
  • Wireless base station controllers
  • Cable infrastructure
  • Data communications


  • Supports GR-1244 Stratum 3 stability in holdover mode
  • Supports smooth reference switchover with virtually no disturbance on output phase.
  • Supports Telcordia GR-253 Jitter Generation, Transfer, and Tolerance for SONET/SDH up to OC-192 Systems
  • Supports ITU-T G.8262 Synchronous Ethernet slave clocks
  • Supports ITU-T G.823, G.824, G.825, and G.8261.
  • Auto/manual holdover and reference switchover
  • Two Reference inputs (single-ended or differential)
  • Input reference frequencies from 2 kHz to 1250 MHz
  • Output frequencies 360 kHz to 1250 MHz
  • Programmable digital loop filter covering loop bandwidths from 0.1 Hz to 5 kHz (2 kHz maximum for < 0.1 dB of peaking)
  • Adaptive Clocking
  • See data sheet for additional features

Functional Block Diagram for AD9557


Title Content Type File Type
AD9557: Dual Input Multiservice Line Card Adaptive Clock Translator Data Sheet (Rev B, 05/2013) (pdf, 1299 kB) Data Sheets PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD9557 IBIS Model IBIS Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended Clock Drivers for the AD9557 Recommended Linear Regulators for the AD9557
  • For ultralow noise, low dropout, we recommend the ADP150.
Recommended Switching Controller for the AD9557
  • For a dual controller up to 2 x 25A output current, we recommend the ADP1829.

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Price, packaging, availability

AD9557 Model Options
Price Table Help

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.

AD9557 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD9557/PCBZ Status: Production Evaluation Board $190.00 Yes -

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.

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