Features

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s

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15ns settling (0.1%)

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180MHz bandwidth

Applications

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Single-to-differential conversion

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Single supply ADC signal conditioner

General Description

The Comlinear CLC503 is a single-ended to differential amplifier.

It utilizes a pair of closed-loop transconductance amplifiers to

provide wideband, high fidelity, differential output signals. Internal

resistors set the differential gain to 2V/V. With a ground-centered

output signal. This differential output signal is centered around an

adjustable common mode voltage. An independent input controls

the common mode output voltage. The CLC503 has harmonic

distortion products of -77dBc or less, and a signal to noise ratio of

72dB. The output stage is optimized for loads with signal ranges

between +0.7 and +3.9 volts, such as those found on single

supply CMOS ADCs. Overdrive recovery time of the CLC503

and following circuitry is optimized by the output limiting of the

in applications where unused circuitry is placed in a low

power mode.

The CLC503 is an ideal amplifier to drive the differential inputs

of the Comlinear CLC949, 12-bit, 20MSPS, analog-to-digital

converter.

It is tailored for driving single supply, differential

input, analog-to-digital converters which require fast settling, high

fidelity inputs.

Harmonic Distortion vs. Amplitude

4

12

3

5

-85

-80

-75

-70

-65

-60

10MHz

5MHz

2MHz

1MHz

-90

0

GND

2K

2K

AMP

CORE

Typical Application Diagram

Pinout

SOIC

CLC503

CLC949

74AC04

Power Down

ADC Clock

GND

BIASC

CLK

GND

-5V

0.1

µF

0.1

µF

0.1

µF

12b/20MSPS ADC

6.8

µF

+5V

0.1

µF

6.8

µF

Comlinear CLC503

180MHz, Differential-Output Amplifier

August 1996

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© 1996 National Semiconductor Corporation

http://www.national.com

Printed in the U.S.A.