AD9547

RECOMMENDED FOR NEW DESIGNS

Dual/Quad Input Network Clock Generator/Synchronizer

Data Sheet (Rev. H) Product Selection Table

Part Models: 2
1ku List Price: Starting From $16.82

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Overview

Supports Stratum 2 stability in holdover mode
Supports reference switchover with phase build-out
Supports hitless reference switchover
Automatic/manual holdover and reference switchover
2 pairs of reference input pins, with each pair configurable as a single differential input or as 2 independent single-ended inputs
Input reference frequencies from 1 kHz to 750 MHz
Reference validation and frequency monitoring (1 ppm)
Programmable input reference switchover priority
30-bit programmable input reference divider

2 pairs of clock output pins, with each pair configurable as a single differential LVDS/LVPECL output or as 2 single-ended CMOS outputs
Output frequencies up to 450 MHz
20-bit integer and 10-bit fractional programmable feedback divider
Programmable digital loop filter covering loop bandwidths from 0.001 Hz to 100 kHz
Optional low noise LC-VCO system clock multiplier
Optional crystal resonator for system clock input
On-chip EEPROM to store multiple power-up profiles
Software controlled power-down
64-lead LFCSP package

The AD9547 provides synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9547 generates an output clock that is synchronized to one of two differential or four single-ended external input references. The digital PLL allows for reduction of input time jitter or phase noise associated with the external references. The AD9547 continuously generates a clean (low jitter), valid output clock, even when all references fail, by means of digitally controlled loop and holdover circuitry.

The AD9547 operates over an industrial temperature range of −40°C to +85°C.

Applications

Network synchronization

Cleanup of reference clock jitter

SONET/SDH clocks up to OC-192, including FEC

Stratum 2 holdover, jitter cleanup, and phase transient control

Stratum 3E and Stratum 3 reference clocks

Wireless base stations, controllers

Cable infrastructure

Data communications

Part Models: 2
1ku List Price: Starting From $16.82

Documentation

Data Sheet 1

AD9547: Dual/Quad Input Network Clock Generator/Synchronizer Data Sheet (Rev.H) 11/25/2024

User Guide 1

UG-639: Evaluating the AD9547 and AD9548 Digital PLL Clock Synthesizers 04/16/2014

Frequently Asked Question 1

FAQ 09/05/2025

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
AD9547BCPZ	64-Lead LFCSP (9mm x 9mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD9547BCPZ-REEL7	64-Lead LFCSP (9mm x 9mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 26, 2023 - 23_0025 Package Outline Drawing and Data Sheet Revision for Select LFCSP Products in Amkor
		PCN23_0025_Form Material_Report Package Outline Drawing Qualification Results Summary
AD9547BCPZ	PRODUCTION
AD9547BCPZ-REEL7	PRODUCTION
Oct 20, 2010 - 10_0262 AD9547 mask change
		PCN10_0262_Form Material_Report Qualification Plan Summary
AD9547BCPZ	PRODUCTION
AD9547BCPZ-REEL7	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

Evaluation Software 2

AD9547/AD9548 Evaluation Board USB Flash Programmer Readme

readme-ad9547-ad9548-evaluation-board-usb-flash-programmer

AD9547/AD9548 Evaluation Board USB Flash Programmer Readme (Rev. )

AD9547/AD9548 Evaluation Software Installer

AD9547/AD9548 Evaluation Software Installer (Rev. 2.0.2)

Can't find the software or driver you need?

Tools & Simulations

AD9547 IBIS Models 1

AD9547 (All Models/All Speed Grades)

Evaluation Kits

AD9547 Evaluation Board

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Features and Benefits

Simple power connection using 6 V wall adapter and onboard switching and LDO voltage regulators
Regulators easily bypassed for power measurements
8 ac-coupled SMA connectors for output
SMA connectors for
2 differential or 4 single-ended reference input
System clock input
On-board provisions for OCXO, crystal oscillator, or crystal
USB connection to PC
32-bit or 64-bit Windows-based evaluation software with simple graphical user interface
On-board PLL loop filter
Easy access to digital I/O and diagnostic signals via I/O header
Status LEDs for diagnostic sig

Product Details

The AD9547 is a very low noise DDS-based digital PLL clock synthesizer with up to four reference inputs and up to four outputs. The AD9547 features reference clock validation, automatic holdover, and hitless reference clock switching. The AD9547 is capable of accepting reference input clocks as low as 1 kHz. The AD9547 Revision A evaluation board is a compact, easy-to use platform for evaluating all features of the AD9547.