Clock Buffers achieve 75 and 100 fsec jitter performance.

Press Release Summary:

Compact clock buffers include 12-channel ADCLK954 LVPECL, with 2 selectable differential inputs via IN_SEL control pin, and 6-channel ADCLK946 LVPECL clock fanout buffers, both with jitter as low as 75 fsec and skew of 9 psec. Model ADCLK854 LVDS/CMOS is 12-channel chip with 2 selectable inputs and sleep-mode feature, which along with 6-channel ADCLK846 LVDS, offer 100 fsec jitter. All operate at 12 mW/channel at 100 MHz and are suited for clocking high-speed ADCs.

Original Press Release:

Clock Buffers Achieve 75-FS and 100-FS Jitter Performance and 9-PS Skew

- ADI's LVPECL and LVDS clock fanout buffers are industry's fastest 6- and 12-channel, compact clock buffers for high-speed applications requiring low jitter.

- Effective for clocking high-speed data converters.

Norwood, MA (06/05/2009) - Analog Devices, Inc. (ADI), a global leader in high-performance semiconductors for signal-processing applications and world leader in data-conversion technology, announced today the industry's best performing 6- and 12-channel, compact clock buffers for high-speed applications requiring low jitter. ADI's 12-channel ADCLK954 LVPECL and ADCLK854 LVDS/CMOS and 6-channel ADCLK946 LVPECL and ADCLK846 LVDS clock fanout buffers provide up to four times as many clock channels on a single chip, with better combined jitter and skew performances than competing devices in their category. Jitter is as low as 75 fs (femto seconds) for ADI's LVPECL (low voltage positive emitter coupled logic) fanout buffers and 100 fs for its LVDS (low voltage differential signaling)/CMOS fanout buffers. In addition, the ADCLK9xx clock buffers offer an extremely low 9-ps (pico second) skew. The ADCLK854 clock buffer also offers 24 CMOS (complementary metal oxide semiconductor) channels.

With these specifications, the clock buffers are effective for clocking high-speed ADCs (analog-to-digital converters) and DACs (digital-to-analog converters) and are suitable for high-performance applications, such as wireless infrastructure equipment, medical imaging and industrial applications that require high speed, high channel density and outstanding timing performance.

The 6- to 12- additional clock channels reduce component count and board space while simplifying high-speed signal-chain design and lowering overall bill-of-materials costs.

Breakthrough Jitter and Skew Performance; Better Converter Clocking

The industry-leading jitter and skew performance that the 12-channel ADCLK954 and the 6-channel ADCLK946 LVPECL fanout buffers deliver allows design engineers to achieve better SNR (signal-to-noise ratio) from an ADC or DAC. The 4.8-GHz ADCLK954 has two selectable differential inputs via the IN_SEL control pin. Both inputs are equipped with 100-ohm on-chip termination resistors and may operate with either differential or single-ended clock sources.

Faster Converter Clocking on Lower Power

The 12 LVDS/24 CMOS-channel ADCLK854 and 6 LVDS/12-CMOS-channel ADCLK846 provide high timing performance at 100-fs jitter. All the clock buffers allow design engineers to benefit from the full resolution and performance of high-speed ADCs and DACs while maintaining low power of 12-mW per channel at 100-MHz operation. The ADCLK854 offers two selectable inputs and a sleep-mode feature. The IN_SEL pin-state determines which input fans out to the outputs. The SLEEP pin enables a sleep mode to power down the device. The inputs accept various single-ended and differential logic levels, including LVPECL, LVDS, HSTL (high speed transceiver logic), CML (current-mode logic) and CMOS.

Pricing, Availability and Complementary Parts

Product Availability Price Each Per 1,000 Channels Temperature Range Packaging
ADCLK846 NOW $4.75 6/12 -40°C to +85°C 24-lead LFCSP
ADCLK854 NOW $5.95 12/24 -40°C to +85°C 48-lead LFCSP
ADCLK946 NOW $6.25 6 -40°C to +85°C 24-lead LFCSP
ADCLK954 NOW $6.95 12 -40°C to +85°C 40-lead LFCSP

Complementary parts include ADI's clock generator and distribution ICs, such as the AD9549 clock generator and the AD9551 clock generator. The new 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 DACs.

For more information, visit and For product information on clocks, visit

About Analog Devices

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 industry-wide 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.

TxDAC is a registered trademark of Analog Devices, Inc.

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