LINEAR LT1794 User Guide Manual
Summary
This dual xDSL Line Driver Amplifier provides reliable, high-performance signal amplification essential for ADSL and HDSL telecommunications applications. It features outstanding distortion performance and extended output swing, maximizing efficiency even with lower supply rails. This manual details the full electrical specifications, rigorous application guidelines, and circuit design examples necessary for implementing robust line drivers in central office equipment or complex industrial test systems.
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LT1794
Dual 500m A, 200MHz x DSL Line Driver Amplifier
FEATURES DESCRIPTIO Exceeds All Requirements For Full Rate, The LT®1794 is a 500m A minimum output current, dual op Downstream ADSL Line Drivers amp with outstanding distortion performance. The ampli- ±500m A Minimum IOUT fiers are gain-of-ten stable, but can be easily compensated ±11.1V Output Swing, VS = ±12V, RL = 100Ω for lower gains. The extended output swing allows for ±10.9V Output Swing, VS = ±12V, IL = 250m A lower supply rails to reduce system power. Supply current Low Distortion: – 82d Bc at 1MHz, 2VP-P Into 50Ω is set with an external resistor to optimize power dissipa- Power Saving Adjustable Supply Current tion. The LT1794 features balanced, high impedance in- Power Enhanced Small Footprint Packages: puts with low input bias current and input offset voltage. 20-Lead TSSOP and 20-Lead SW Active termination is easily implemented for further sys- 200MHz Gain Bandwidth tem power reduction. Short-circuit protection and thermal 500V/µs Slew Rate shutdown insure the device’s ruggedness. Specified at ±15V, ±12V and ±5V
The outputs drive a 100Ω load to ±11.1V with ±12V supplies, and ±10.9V with a 250m A load. The LT1794,
APPLICATIO S
with its increased swing on lower supplies, can be used to High Density ADSL Central Office Line Drivers upgrade LT1795 line driver applications.
High Efficiency ADSL, HDSL2, G.lite,
The LT1794 is available in the very small, thermally
SHDSL Line Drivers
enhanced, 20-lead TSSOP for maximum port density in
Buffers
line driver applications. The 20-lead SW is also available.
Test Equipment Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
Cable Drivers
TYPICAL APPLICATIO
High Efficiency ±12V Supply ADSL Central Office Line Driver
RBIAS 24.9k
SHDN 12.7Ω
1/2 LT1794
*COILCRAFT X8390-A OR EQUIVALENT ISUPPLY = 10m A PER AMPLIFIER
1/2 WITH RBIAS = 24.9k LT1794
SHDNREF
1794 TA01
Page Summary Contents For LINEAR LT1794 User Guide Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 271.19 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the minimum current output capability of the LT1794?
It is a dual line driver amplifier with a minimum output current of 500mA.
Does the device offer built-in protection features?
Yes, it includes short-circuit protection, thermal shutdown, and slew rate shutdown for enhanced ruggedness.
What are the operating temperature ranges?
The specified operational temperature range is –40°C to 85°C.
Can this device be used for upgrading older systems?
Yes, due to its increased output swing on lower supplies, it can upgrade LT1795 line driver applications.