LT1809CS6 datasheet(20/24 Pages) LINER

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LT1809/LT1810

TYPICAL APPLICATIO S

Single Supply Video Line Driver

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

output current that allows it to drive video signals in low

supply applications. Figure 8 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. A 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 75

Ω line with the back-terminated

resistor, R5. The back termination will eliminate any re-

flection 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 band-

width of the driver is about 95MHz on 5V supply and the

amount of peaking will vary upon the value of capacitor C4.

–

LT1809

VIN

1809 F08

µF

150

µF

Ω

RLOAD

Ω

VOUT

3pF

Ω

COAX CABLE

1000

µF

FREQUENCY (MHz)

–2

–3

–4

–1

0.2

100

1809 F09

–5

VS = 5V

Figure 8. 5V Single Supply Video Line Driver

Figure 9. Video Line Driver Frequency Response

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