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LT1806/LT1807

18067fc

TYPICAL APPLICATIONS

Single Supply Video Line Driver

The LT1806/LT1807 are wideband rail-to-rail op amps with

large output current that allows them to drive video signals

in low supply applications. Figure 4 depicts a single supply

video line driver with AC coupling to minimize the quies-

cent power dissipation. Resistors R1 and R2 are used to

level-shift the input and output to provide the largest signal

swing. The gain of 2 is set up with R3 and R4 to restore

the signal at VOUT, which is attenuated by 6dB due to the

matching of the 75Ω line with the back-terminated resistor,

R5. The back termination will eliminate any reﬂection of

the signal that comes from the load. The input termination

resistor, RT, is optional—it is used only if matching of

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. The –3dB bandwidth of the

driver is about 90MHz on 5V supply, and the amount of

peaking will vary upon the value of capacitor C4.

Figure 4. 5V Single Supply Video Line Driver

–

LT1806

VIN

18067 F04

33μF

150μF

75Ω

RLOAD

75Ω

VOUT

3pF

75Ω

75W

COAX CABLE

1000μF

Figure 5. Video Line Driver Frequency Response

FREQUENCY (MHz)

–2

–3

–4

–1

0.2

100

18067 F05

–5

VS = 5V, 0V

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