LMV331-N, LMV339-N, LMV393-N

SNOS018G – AUGUST 1999 – REVISED FEBRUARY 2013

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POSITIVE PEAK DETECTOR

Positive peak detector is basically the comparator operated as a unit gain follower with a large holding capacitor

from the output to ground. Additional transistor is added to the output to provide a low impedance current source.

When the output of the comparator goes high, current is passed through the transistor to charge up the

capacitor. The only discharge path will be the 1 M

Ω resistor shunting C1 and any load that is connected to the

output. The decay time can be altered simply by changing the 1 M

Ω resistor. The output should be used through

a high impedance follower to a avoid loading the output of the peak detector.

Figure 19. Positive Peak Detector

NEGATIVE PEAK DETECTOR

For the negative detector, the output transistor of the comparator acts as a low impedance current sink. The only

discharge path will be the 1 M

Ω resistor and any load impedance used. Decay time is changed by varying the 1

M

Ω resistor.

Figure 20. Negative Peak Detector

DRIVING CMOS AND TTL

The comparator's output is capable of driving CMOS and TTL Logic circuits.

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