Overview

Features and Benefits

  • Exceeds All Requirements For Full Rate, Downstream ADSL Line Drivers
  • ±500mA Minimum Iout
  • ±11.1V Output Swing, VS = ±12V, RL = 100Ω
  • ±10.9V Output Swing, VS = ±12V, IL = 250mA
  • Low Distortion: –82dBc at 1MHz, 2Vp-p Into 100Ω
  • Power Saving Adjustable Supply Current
  • Power Enhanced Small Footprint Packages:
    20-Lead TSSOP and 20-Lead SW
  • 200MHz Gain Bandwidth
  • 500V/µs Slew Rate
  • Specified at ±15V, ±12V and ±5V

Product Details

The LT1794 is a 500mA minimum output current, dual op amp with outstanding distortion performance. The amplifiers are gain-of-ten stable, but can be easily compensated for lower gains. The extended output swing allows for lower supply rails to reduce system power. Supply current is set with an external resistor to optimize power dissipation. The LT1794 features balanced, high impedance inputs with low input bias current and input offset voltage. Active termination is easily implemented for further system power reduction. Short-circuit protection and thermal shutdown insure the device’s ruggedness.

The outputs drive a 100Ω load to ±11.1V with ±12V supplies, and ±10.9V with a 250mA load. The LT1794, with its increased swing on lower supplies, can be used to upgrade LT1795 line driver applications.

The LT1794 is available in the very small, thermally enhanced, 20-lead TSSOP for maximum port density in line driver applications. The 20-lead SW is also available.

Applications

  • High Density ADSL Central Office Line Drivers
  • High Efficiency ADSL, HDSL2, G.lite, SHDSL Line Drivers
  • Buffers
  • Test Equipment Amplifiers
  • Cable Drivers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

LT1794

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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