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AFE device targets VDSL2, ADSL2+ CPE

Posted: 06 Jun 2006 ?? ?Print Version ?Bookmark and Share

Keywords:PMC-Sierra? PM4380? analog front end? AFE? VDSL2?

PMC-Sierra Inc. has introduced the PM4380 analog front end (AFE) for VDSL2 and ADSL2++ customer premises equipment (CPE). According to the company, the highly integrated CMOS device is a stand-alone VDSL2 AFE, enabling OEMs to quickly bring to market VDSL2 modem or residential gateway products. VDSL2 technology allows service providers to offer significantly faster and more robust broadband connections to support the deployment of IPTV and other advanced IP services.

By tackling the difficult mixed-signal challenges inherent to the design of such an AFE, PMC-Sierra said it is enabling new entrants into the rapidly expanding VDSL2 CPE market. Features of the new AFE include extended rate/reach; full backwards compatibility to ADSL2+; high integration, eliminating the need for a discrete line driver and external power supply and clock components, thereby reducing BOM costs and real estate; and, ADSL2+/VDSL2 interface specification (AVIS) flexible digital interface, which reduces pin-count and provides compatibility with a wide range of xDSL discrete multitone (DMT) processors.

The AFE integrates a 5V line driver and offers extremely low transmit path distortion and noise floor. The receive path, including the integrated ultra-low noise amplifier provides an input-referred noise density of -150dBm/Hz, while high-precision 16bit data converters offer best-in-class performance on both receive and transmit chains.

The low transmit and receive noise floors, combined with high-resolution data converters and integrated programmable receive equalizer and filters, reduce the need for complex and costly external filters to achieve optimum rate/reach performance. In addition, the device integrates a 16bit digitally controlled crystal oscillator that provides better than 0.02ppm frequency resolution, and an optional 1.8V regulator that allows the new device to be used in a system that only provides 3.3V and 5V. By offering this performance, the new device enables OEMs to deliver products that provide faster broadband connections over longer loop lengths.

"PMC-Sierra has a strong history in developing leading-edge mixed-signal CMOS products for communications applications, and we have capitalized on this expertise to bring to market a leading-edge family of robust DSL AFEs," said Dino Bekis, vice president of marketing and applications for PMC-Sierra's Communication Products Division. "Together with our recently announced MSP7100 multi-service processor family, we are delivering breakthrough-performance semiconductor solutions for the delivery of IPTV and other advanced IP services over broadband."

PMC-Sierra also introduced the PM4381 ADSL2+ AFE. The device is pin compatible with the PM4380, enabling vendors to produce cost optimized ADSL2+ variants. The PM4381 interfaces directly to the company's MSP7120 ADSL2+ multi-service processor, which integrates Aware Inc.'s StratiPHY2+ IP, and promises a complete chipset for advanced residential gateways and integrated access devices.

According to PMC-Sierra, both devices implement the company's ADSL2+/VDSL2 AVIS digital interface, which simplifies connection to a variety of DSL DMT processors by offering selectable data rates, clocking modes and control signaling. The AVIS interface offers a nibble-wide configuration to help reduce pin-count on the connecting modem chips.

A comprehensive support package, including reference design and application notes, is available upon request.

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