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LT1739CFE Datasheet(PDF) 1 Page - Linear Technology |
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LT1739CFE Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LT1739 1739fas, sn1739 APPLICATIO S DESCRIPTIO FEATURES TYPICAL APPLICATIO Dual 500mA, 200MHz xDSL Line Driver Amplifier s 3mm × 4mm High Power DFN Package s Exceeds All Requirements For Full Rate, Downstream ADSL Line Drivers s ±500mA Minimum IOUT s ±11.1V Output Swing, VS = ±12V, RL = 100Ω s ±10.9V Output Swing, VS = ±12V, IL = 250mA s Low Distortion: – 82dBc at 1MHz, 2VP-P Into 50Ω s Power Saving Adjustable Supply Current s Power Enhanced TSSOP-20 Small Footprint Package s 200MHz Gain Bandwidth s 600V/ µs Slew Rate s Specified at ±12V and ±5V s High Density ADSL Central Office Line Drivers s High Efficiency ADSL, HDSL2, G.lite, SHDSL Line Drivers s Buffers s Test Equipment Amplifiers s Cable Drivers The LT ®1739 is a 500mA minimum output current, dual op amp with outstanding distortion performance. The ampli- fiers 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 dissipa- tion. The LT1739 features balanced, high impedance in- puts with low input bias current and input offset voltage. Active termination is easily implemented for further sys- tem power reduction. Short-circuit protection and thermal shutdown insure the device’s ruggedness. The outputs drive a 100 Ω 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 × 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. High Efficiency ±12V Supply ADSL Central Office Line Driver 1739 TA01 + – 1/2 LT1739 –IN – + 1/2 LT1739 +IN 12V SHDN –12V 12.7 Ω RBIAS 24.9k 1:2* 110 Ω 1000pF 110 Ω 1k 1k 12.7 Ω SHDNREF 100 Ω *COILCRAFT X8390-A OR EQUIVALENT ISUPPLY = 10mA PER AMPLIFIER WITH RBIAS = 24.9k , LTC and LT are registered trademarks of Linear Technology Corporation. 4mm 3mm 0.8mm 1739 TA02 EXPOSED THERMAL PAD 3mm × 4mm DFN Package Bottom View |
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