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LT1739 - Dual 500mA, 200MHz xDSL Line Driver Amplifier

TheLT®1739 is a 500mA minimum outputcurrent,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 LT1739 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 100 Ohms load to ±11.1V with ±12V supplies, and ±10.9V with a 250mA load. The LT1739 is a pin-for-pin replacement for the LT1794 in xDSL line driver applications and requires no circuit changes.

The LT1739 is available in the very small, thermally enhanced, 3mm x 4mm DFN package or a 20-lead TSSOP for maximum port density in central office line driver applications. For a dual version of the LT1739, see the LT6301 data sheet.

Features 3mm x 4mm High Power DFN Package Exceeds All Requirements For Full Rate, Downstream ADSL Line Drivers ±500mA Minimum IOUT ±11.1V Output Swing, VS = ±12V,RL = 100 Ohms ±10.9V Output Swing, VS = ±12V,IL = 250mA Low Distortion: –82dBc at 1MHz,2VP-P Into 50 Ohms Power Saving Adjustable Supply Current Power Enhanced TSSOP-20 Small Footprint Package 200MHz Gain Bandwidth 600V/µs Slew Rate Specified at ±12V and ±5V Typical Application

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