9

LT1195

S

APPLICATI

I FOR ATIO

Output Shutdown

–

+

LT1195

75

Ω

1k

5V

1195 AI05

3

2

7

4

6

75

Ω

1000

µF

10k

10

µF

1k

5V

1k

R2

2k

100

µF

R1

3k

+

+

+

Video Multiburst at Pin 6 of Amplifier

Detecting Pulses

The front page shows a circuit for detecting very fast

pulses. In this open-loop design, the detector diode is D1

and a level shifting or compensating diode is D2. A load

value resistors ensure that the diode drops are equal. A

very fast pulse will exceed the amplifier slew rate and

cause a long overload recovery time. Some amount of

dV/dt limiting on the input can help this overload condi-

tion, however too much will delay the response. Also

The maximum output slew rate in the photo is 30V/

µs.This

rate is set by the 30mA current limit driving 1000pF.

Operation on Single 5V Supply

The LT1195 has been optimized for a single 5V supply.

including sync) by 2 and drives a double-terminated 75

Ω

cable. Resistors R1 and R2 bias the amplifier at 2V,

allowing the sync pulses to stay within the common-mode

range of the amplifier. Large coupling capacitors are

required to pass the low frequency sidebands of the

composite signal. A multiburst response and vector plot

standard color burst are shown.

Single 5V Video Amplifier

1195 AI04

1MHz SINE WAVE GATED OFF WITH SHUTDOWN PIN

Vector Plot of Standard Color Burst

1195 AI06

3V

2V

1V

0V

1195 AI07