Analog Devices Press Release - June 11, 2009
Analog Devices First Clock IC to Harness GPS Signals for Synchronization
ADI’s AD9548 taps ubiquitous GPS signals as a timing base; replaces multi-chip clocks with an accurate,
highly integrated alternative for cable, optical networks and wireless base stations.
June 11, 2009 -- NORWOOD, Mass.--(EON: Enhanced Online News)-- Analog Devices, Inc. (ADI), a
global leader in high-performance signal processing, introduced today the industry’s first clock IC that enables
system designers to use the standard, readily available and free 1-pps (pulse-per-second) signal of GPS (global
positioning system) satellite transmitters to generate and synchronize clock signals for communications
remote optical and wireless network nodes, cable infrastructure and data communications equipment, the
AD9548 clock generator/synchronizer eliminates the dedicated oscillators, phase-locked loops, and other
clock recovery circuitry communications systems previously required to generate clock signals synchronized to the
widely available 1-pps GPS standard. Using the
AD9548 to leverage GPS signals simplifies and shortens the design process while providing a lower-power
AD9548 includes a digital PLL that up-converts the 1-pps GPS signal while reducing input-time jitter or
phase noise associated with the external references to as little as 300 femto seconds. The clock distribution
section provides four output drivers. Each driver is programmable either as a single differential LVPECL/LVDS
(low-voltage positive emitter-coupled logic/low-voltage differential signaling) output or as pairs of single-ended
CMOS (complementary metal-oxide semiconductor) outputs. Each of the four outputs has a dedicated 30-bit
programmable post divider enabling the generation of multiple different output frequencies. An integrated
reference clock multiplier allows for system clock references as low as 4 MHz while still supporting outputs of up
to 450 MHz. The
AD9548 also includes a digitally-controlled loop filter programmable to as low as 1-MHz (1x10-3), as well as
manual and automatic holdover circuitry that continuously generates a low jitter, valid output clock even when
some, or all, references have failed.
Pricing, Availability and Complementary Components
Product Availability Price Each Per 1,000 Temperature Range Packaging
NOW $24.82 -40°C to +85°C
Complementary components include ADI clock buffers, including the
ADCLK854 LVDS/CMOS and ADCLK846 LVDS clock buffers, as well as the
ADCLK946. The recently announced
AD9357 transceivers also work well with the
For more information, visit
http://www.analog.com/pr/AD9548. For product
information on ADI’s additional clock and timing offerings, visit
Follow ADI on Twitter at
About Analog Devices, Inc.
Innovation, performance, and excellence are
the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies
within the technology sector. Acknowledged throughout the industry as the world leader in data conversion and
signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of
electronic equipment. Celebrating over 40 years as a leading global manufacturer of high-performance integrated
circuits used in analog and digital signal processing applications, Analog Devices is headquartered in Norwood,
Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices' common stock is
listed on the New York Stock Exchange under the ticker “ADI” and is included in the S&P 500 Index.
For more information on ADI's most recent product releases, visit our
Press Release home page.
Analog Devices, Inc.