SOURCE: Intersil


November 01, 2012 11:00 ET

Intersil Introduces Lowest Power, Dual Port, Class G Line Driver

ISL1561 Drops High Density DSLAM Port Power by > 30%

MILPITAS, CA--(Marketwire - Nov 1, 2012) - Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high-performance analog and mixed signal semiconductors, today extends its 20-year history of providing leading-edge products to the central office DSLAM market with the introduction of the ISL1561, the most power-efficient Class G line driver.

Designed for existing and emerging xDSL central office reference designs with significant improvements over Class H solutions, the ISL1561 provides backward compatibility to existing +14V systems. Its industry leading design supports another 10% power savings in emerging +12V single supply systems.

Each of the two ports is internally configured for a fixed 11.6V/V gain using a specific external build out resistor and a cross-coupled feedback, providing active output impedance with reduced losses. A three-pin serial interface allows each port to be separately tuned to the minimum required quiescent current for the intended signal standard. Two external supply voltage boost caps provide a brief peak in the total output stage voltage to supply the peak line voltages using a control signal from the AFE.

Features and Benefits

  • Nominal quiescent current to support full line power for ADSL2+ is only 8mA/port; VDSL2+ 8b is 10mA/port; and VDSL2+ 17a is only 12mA/port
  • For the most demanding 8b profile, total quiescent power to deliver 19.5dBm to the line is reduced from > 900mW/port to < 620mW/port
  • Signal peaks maintains a signal linearity comparable to much higher power +24V class AB solutions
  • Provides < -60dBc MultiBand Power Ratio (MBPR) to the highest target line powers

Pricing and Availability
The ISL1561 is available now in compact 24-lead QFN packages, with prices starting at $2.57 each in 1,000-unit quantities. For more information please visit:

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About Intersil
Intersil Corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management semiconductors. The company's products address some of the fastest growing markets within the industrial and infrastructure, personal computing and high-end consumer markets. For more information about Intersil or to find out how to become a member of our winning team, visit our website and career page at

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