Datasheet Linear Technology LT1969 — Datenblatt

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  Reduce Power Consumption of DSL Modems with the LT1969 Line Driver &mdash LT Journal
  PDF, 50 Kb, Datei veröffentlicht: Dec 1, 2001
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  DESIGN IDEAS Reduce Power Consumption of DSL
  Modems with the LT1969 Line Driver
  by Tim Regan Introduction
  also dissipated by the line-driver stage.
  The driver stage must have large
  enough power supply rails to prevent
  clipping of the peaks of the DMT
  signal in ADSL or the PAM signals of
  HDSL2. These peaks can be four to
  six times the normally transmitted
  RMS signal. The quiescent biasing
  current of the amplifiers times the
  increased power supply voltage level
  sets the minimum power consumption of the driver stage, even when no
  signal is being transmitted.
  This issue becomes a major concern in central office DSL designs
  where multiport cards are required. It
  is less of a problem on the CPE end of
  the connection where the power dissipation of just a single modem or
  port can be tolerated. However, as the
  deployment of DSL into the office The LT1969 is an ADSL line driver
  ideally suited for CPE modem designs,
  with the added feature of programmable operating current. With a …

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