LT1204CSW datasheet(18/20 Pages) LINER

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LT1204

APPLICATI

TYPICAL

CABLE

OUTPUT

LT1204

#2 OUTPUT

A0 PIN 9

1204 TA05

Differential Receiver Switching Waveforms

FREQUENCY (Hz)

–60

–40

–20

10k

10M

100M

1204 TA06

100k

VS = ±15V

RL = 100Ω

DIFFERENTIAL MODE RESPONSE

COMMON MODE RESPONSE

4-Input Twisted-Pair Driver

It is possible to send and receive color composite video

signals appreciable distances on a low cost twisted pair.

The cost advantage of this technique is significant. Stan-

dard 75

Ω RG-59/U coaxial cable cost between 25¢ and

50¢ per foot. PVC twisted pair is only pennies per foot.

Differential signal transmission resists noise because the

interference is present as a common mode signal. The

LT1204 can select one of four video cameras for instance,

and drive the video signal on to the twisted pair. The circuit

uses an LT1227 current feedback amplifier connected with

a gain of – 2, and an LT1204 with a gain of 2. The 47

Ω

resistors back-terminate the low cost cable in its charac-

teristic impedance to prevent reflections. The receiver for

the differential signal is an LT1193 connected for a gain of

2. Resistors R1, R2 and capacitors C1, C2 are used for

cable compensation for loss through the twisted pair.

Alternately, a pair of LT1204s can be used to perform the

differential to single-ended conversion.

Multiburst Pattern Passed Through 1000 Feet of Twisted Pair,

No Cable Compensation

Multiburst Pattern Passed Through 1000 Feet of Twisted Pair,

with Cable Compensation

1204 TA08

OUTPUT

INPUT

OUTPUT

1204 TA09

Differential Receiver Response

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