LT1195(Rev0) 查看數據表（PDF） - Linear Technology

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LT1195
(Rev.:Rev0)

Low Power, High Speed Operational Amplifier

Linear Technology 

LT1195

APPLICATI S I FOR ATIO

Output Shutdown

+

100µF

5V

R1

3k

R2

2k

Single 5V Video Amplifier

VIN

+ 10µF 5V

1k

3+ 7

LT1195

2–

4

RG

1k

1000µF

6 + 75Ω

RFB

1k

10k 75Ω

1195 AI05

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

9

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