Features

s

s

96mA output current

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1.5mA supply current

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-85/-75dBc HD2/HD3

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15ns settling to 0.2%

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-74dBc input-referred crosstalk (5MHz)

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Single version available (CLC408)

Applications

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ADSL/HDSL driver

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Coaxial cable driver

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UTP differential line driver

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Transformer/coil driver

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High capacitive-load driver

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Video line driver

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Portable/battery-powered line driver

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Differential A/D driver

418 Pinout

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-

1/2

CLC418

418 Typ App Diag

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-

-

+

1/2

CLC418

UTP

I:n

Typical Application Diagram

Differential Line Driver

with Load Impedance Conversion

Pinout

DIP & SOIC

General Description

The Comlinear CLC418 dual high-speed current-feedback

operational amplifier is designed to drive low-impedance and

high capacitance loads while maintaining high signal fidelity.

Operating on ±5V power supplies, each of the CLC418’s

amplifiers produces a continuous 96mA output current. Into a

back-terminated 50

Ω load, the devices produce -85/-64dBc

The CLC418’s current-feedback architecture maintains consistent

performance over a wide range of gain and signal levels. DC gain

and bandwidth can be set independently. With proper resistor

selection, either maximally flat gain response or linear phase

response can be selected.

Requiring a mere 15mW quiescent power per amplifier, the

CLC418 offers superior performance-vs-power with a 130MHz

small-signal bandwidth, 350V/ms slew rate and quick 4.6ns

rise/fall times (2Vstep). The combination of low quiescent power,

high output current drive and high performance make the

CLC418 a great choice for many battery-powered personal

communication/computing systems.

Combining the CLC418’s two amplifiers (shown below) results in

a powerful differential line driver for driving video signals over

unshielded twisted-pair (UTP). The CLC418 can also be used for

driving differential-input step-up transformers for applications

such as Asynchronous Digital Subscriber Lines (ADSL) or High-

Bit-Rate Digital Subscriber Lines (HDSL).

The CLC418’s amplifiers make excellent low-power high-

resolution A-to-D converter drivers with their very fast 15ns set-

tling time (to 0.2%) and ultra-low -85/-75dBc harmonic distortion

Non-Inverting Frequency Response

Ω)

Frequency (Hz)

418 Freq. Resp. Plot

10M

1M

100M

Comlinear CLC418

Dual High-Speed, Low-Power Line Driver

N

August 1996

© 1996 National Semiconductor Corporation

http://www.national.com

Printed in the U.S.A.