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

s

s

s

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

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

24.9k

1:2*

110

Ω

1000pF

110

Ω

1k

1k

12.7

Ω

SHDNREF

100

Ω

*COILCRAFT X8390-A OR EQUIVALENT

, 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