LT1809

8

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

©LINEAR TECHNOLOGY CORPORATION 2000

1809i LT/TP 0100 4K • PRINTED IN USA

RELATED PARTS

TYPICAL APPLICATIO

PART NUMBER

DESCRIPTION

COMMENTS

LT1632/LT1633

Dual/Quad 45MHz, 45V/

µs Rail-to-Rail Input and Output Op Amps

Max Supply Current 5.2mA per Amplifier

LT1630/LT1631

Dual/Quad 30MHz, 10V/

µs Rail-to-Rail Input and Output Op Amps

High DC Accuracy, 525

Max Supply Current 4.4mA per Amplifier

LT1215/LT1216

Dual/Quad 23MHz, 50V/

µs Single Supply Precision Op Amps

Input Common Mode Includes Ground, 450

6

µV/°C Max Drift, Max Supply Current 6.6mA per Amplifier

Single Supply Video Line Driver

The LT1809 is a wideband rail-to-rail op amp with high

output current that allows it to drive video signals in low

supply applications. Figure 1 depicts a single supply video

line driver with AC coupling to minimize the quiescent

power dissipation. Resistors R1 and R2 are used to level-

shift the input and output to provide the largest signal

swing. The gain of two is set up with R3 and R4 to restore

matching of the 75

Ω line with the back-terminated resis-

tor, R5. The back termination will eliminate any reflection

of the signal that comes from the load. The input termina-

the incoming line is necessary. The values of C1, C2 and

C3 are selected to minimize the droop of the luminance

signal. In some less stringent requirements, the value of

capacitors could be reduced.

–

+

LT1809

1809 TA02

C1

33

µF

C2

150

µF

75

Ω

75

Ω

R2

5k

R3

1k

R4

1k

R1

5k

5V

2

3

6

7

4

R5

75

Ω

75

Ω

COAX CABLE

C3

1000

µF

+

Figure 1. Single Supply Video Line Driver