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| PM4381 Analog Front End for ADSL2+ Preliminary Product Brief PRODUCT OVERVIEW The PM4381 Analog Front End (AFE) is a highly integrated solution for Customer Premises Equipment (CPE) ranging from standalone modems to Residential Gateways. The PM4381 AFE is suitable for ADSL2+ CPE, and is fully backwards compatible with ADSL2 and ADSL interface technologies. The PM4381 AFE achieves industry-leading performance giving DSL service providers the ability to offer faster broadband connections over farther distances. The high degree of integration allows DSL box vendors to build CPE products with lower BOM cost, and in more attractive, smaller form factors. The PM4381 integrates a high performance 5V line driver and offers extremely low distortion and noise in both transmit and receive paths. The low noise and distortion, 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 16-bit digitally controlled crystal oscillator (DCXO), and an optional 1.8V regulator that allows the PM4381 to be used in a system that only provides 3.3V and 5V. The PM4381 AFE implements PMC-Sierra's AVIS (ADSL2+/VDSL2 Interface Specification) digital interface, which allows flexible connection to a variety of Discrete Multitone (DMT) processors, including PMC-Sierra's MSP7120 ADSL2+ Residential Gateway (RG) SoC. BENEFITS * Enables industry-leading rate versus reach performance * Full backwards compatibility to ADSL2 and ADSL * High integration, eliminating the need for a discrete line driver and external power supply and clock components, thereby reducing BOM costs and real estate. * AVIS flexible digital interface reduces pin-count and provides compatibility with a wide range of ADSL DMT processors, including PMC-Sierra's MSP7120 ADSL2+ RG SoC. PRODUCT HIGHLIGHTS INTEGRATED FUNCTIONS * 5V Line Driver delivers +14.5 dBm to the line * Ultra Low-Noise Amplifier (LNA) and receive chain realize input- referred noise of -150 dBm/Hz * 16-bit DAC and 16-bit ADC * Receive bandpass, equalization, and anti-alias filters * Transmit path gain control (24 dB range) * Receive path gain control (54 dB range) * DCXO and PLL clock synthesizer * Reference frequency and voltage generation * Linear regulator (1.8V) for digital circuitry (optional) ANALOG/DIGITAL BANDWIDTH * AVIS 16-bit interface supports 16-bit transfers over nibble-wide bus at speeds of 8.832 MSamples/s * Transmit path signal bandwidth of 26 kHz to 276 kHz * Receive signal bandwidth of 138 kHz to 2.208 MHz BLOCK DIAGRAM PM4381 AFE Digital Interface Digital Core Analog Core LINE DRIVER BYPASS Interpolator AVIS Interface DAC TX Filters LD LINE DRIVER OUTPUT PACKAGE * 56-pin MLF/QFN EPAD (8 x 8 mm) DIGITAL TRANSMIT APPLICATIONS * ADSL2+ CPE Residential Gateway * ADSL2+ Integrated Access Devices * ADSL2+ modem equipment (internal or external) DIGITAL RECEIVE Decimator ADC RX Filters LNA LNA INPUT CONTROL Clock Synthesis REG XTALI DCXO XTALO 1.8V REG OUTPUT PMC-2061394, Issue 1 (c) Copyright PMC-Sierra, Inc. 2006 All rights reserved. Proprietary and Confidential to PMC-Sierra, Inc. and for its customers' internal use. PM4381 Analog Front End for ADSL2+ ADSL2+ RESIDENTIAL GATEWAY AVIS Interface MSP7120 ADSL2+ Multi-Service Procesor PM4381 ADSL2+ AFE ADSL2+ Hybrid Splitter Line FURTHER RESOURCES DIGITAL HOME AND BUSINESS SOLUTIONS www.pmc-sierra.com/digital-home RESIDENTIAL GATEWAY FAMILY SOLUTIONS www.pmc-sierra.com/residential-gateway TECHNICAL DOCUMENTATION www.pmc-sierra.com/products/DocFind.html Corporate Head Office: PMC-Sierra, Inc. Mission Towers One 3975 Freedom Circle Santa Clara, CA, 95054, U.S.A. Tel: 1.408.239.8000 Fax: 1.408. 492.1157 Operations Head Office: PMC-Sierra, Inc. 100-2700 Production Way Burnaby, BC V5A 4X1 Canada Tel: 1.604.415.6000 Fax: 1.604.415.6200 PMC-2061394 [p1] (c) Copyright PMC-Sierra, Inc. 2006. All rights reserved. For a complete list of PMC-Sierra's trademarks , visit www.pmc-sierra.com/legal/. Other product and company names mentioned herein may be the trademarks of their respective owners. For corporate information, send email to: info@pmc-sierra.com. All product documentation is available on our web site at: www.pmc-sierra.com. |
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