ADI Clocking ICs Replace Expensive, High-Frequency VCOs; Improve Jitter
ADI’s AD9552 and AD9547 clock ICs streamline design and lower cost for HDTV, data acquisition, wireless
basestations, test-and-measurement, networking and telecommunications applications.
14, 2009 -- NORWOOD, Mass.
--(EON: Enhanced Online News)-- Analog Devices, Inc. (ADI), a global leader in
high-performance semiconductors for signal-processing applications, expanded its clock-product portfolio today
with the launch of the
oscillator frequency upconverter and the
clock synchronizer. Both products streamline
system designs and reduce implementation complexity and cost while improving jitter performance.
replaces larger, expensive, high-frequency
VCOs (voltage-controlled oscillators), including OCXO (oven-controlled crystal oscillator), VCXO
(voltage-controlled crystal oscillator) and TCXO (temperature-compensated crystal oscillator) devices. The
upconverter requires either a single-ended, low-frequency reference signal or a crystal reference to establish the
higher output frequency the IC generates. It provides ultra-low jitter of under 0.5 ps (picoseconds) operating
with input frequencies in the range of 50 kHz to 80 MHz at half the price of competitive alternatives. The device
can generate almost any desired output frequency up to 900 MHz for a variety of applications, such as HDTV, data
acquisition, wireless basestations, test and measurement, networking and telecommunications. The upconverter
features very low power consumption–less than 400 mW in a compact 5 mm x 5 mm package size.
is a fractional-N, PLL- (phase-locked-loop) based clock generator. The device employs a Σ-Δ (sigma-delta)
modulator to accomplish fractional frequency synthesis. The user supplies an input reference signal by connecting
a single-ended clock signal to the REF pin or by connecting a crystal resonator across the XTAL pins. The
is pin-programmable, providing one of 64
standard output frequencies from any of eight common input frequencies. The device also has a 3-wire SPI
interface, enabling the user to program custom input-to-output frequency ratios. The
requires only a 12-nF external capacitor to
complete the PLL’s loop filter. The output is compatible with LVPECL, LVDS, or single-ended CMOS logic levels.
Next Generation Clock Synchronizer Offers 66 Percent Better Jitter Performance, up to 100-times Narrower Loop
is the next generation of the AD9549 – one of
ADI's most popular new clock devices in both the wired and wireless telecom markets. When compared to the AD9549,
boasts 66 percent better jitter, 100 times
narrower loop-filter bandwidths (as narrow as 1 milliHertz) with twice as many inputs and outputs, and it supports
Stratum-2 level holdover. The
also serves any application with remote
equipment requiring synchronization to local systems. It generates an output clock that synchronizes to one of two
differential or four single-ended external input references saving designers time and money because they no longer
need to rely on additional clock distribution chips to complete their clock trees.
provides synchronization for many systems,
including synchronous optical networks (SONET/SDH). The digital PLL reduces input time jitter or phase noise
associated with the external references. The
continuously generates a clean, low jitter,
valid output clock, even when all references have failed, by means of digitally-controlled loop and holdover
Pricing, Availability and Complementary Parts
Product Availability Price Each Per
NOW $7.65 -40°C to +85°C 5 mm x 5 mm
NOW $13.97 -40°C to +85°C 9 mm x 9 mm
Complementary parts include ADI’s clock generator and distribution ICs, such as the
AD9549 clock generator, AD9551 clock generator and clock buffers such as ADCLK846, ADCLK854, ADCLK946 and
ADCLK954. As part of a signal chain, these clock buffers work well with most of ADI’s data-converter product
families, such as the recently announced suite of low-power dual-channel ADCs and AD9789 14-bit TxDAC® transmit
For more information, visit
. For product
information on clocks, visit
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.
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