LT1195 Ver la hoja de datos (PDF) - Linear Technology

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componentes Descripción

Fabricante

LT1195

Low Power, High Speed Operational Amplifier

Linear Technology 

LT1195

APPLICATIO S I FOR ATIO

Output Shutdown

100µF

5V

R1

3k

Single 5V Video Amplifier

VIN

10µF 5V

1k

3+ 7

1000µF

6

75Ω

LT1195

2–

4

RFB

RG

1k

1k

10k 75Ω

R2

1195 AI05

2k

1MHz SINE WAVE GATED OFF WITH SHUTDOWN PIN

AV = 1, RL = 1k

1195 AI04

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

resistor RL is connected to –5V, and an identical bias

resistor RB is used to bias the compensating diode. Equal

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

shown is the response to a 4VP-P input that is 150ns wide.

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.

This circuit amplifies standard composite video (1VP-P

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

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.

Video Multiburst at Pin 6 of Amplifier

3V

2V

1V

0V

1195 AI06

Vector Plot of Standard Color Burst

1195 AI07

1195fa

9

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