LPV7215MFSLASHNOPB datasheet(18/28 Pages) TI1

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VREF2

VREF1

BOTH OUTPUTS

ARE HIGH

OUTPUT A

OUTPUT B

VIN

OUTPUT A

OUTPUT B

VREF2

VREF1

VIN

LPV7215

SNOSAI6I – SEPTEMBER 2005 – REVISED APRIL 2013

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The capacitor C1 now discharges through R4, and the voltage VC decreases until it is equal to VA2, at which point

the comparator switches again, bringing it back to the initial stage. The time period is equal to twice the time it

takes to discharge C1 from 2VCC/3 to VCC/3, which is given by R4C1·ln2. Hence the formula for the frequency is:

F = 1/(2·R4·C1·ln2)

WINDOW DETECTOR

A window detector monitors the input signal to determine if it falls between two voltage levels.

The comparator outputs A and B are high only when

VREF1 < VIN < VREF2 “or within the window.”

where these are defined as

VREF1 = R3/(R1+R2+R3) * V

VREF2 = (R2+R3)/(R1+R2+R3) * V

(1)

Others names for window detectors are: threshold detector, level detectors, and amplitude trigger or detector.

Figure 42. Window Detector

Figure 43. Window Detector Output Signal

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LPV7215MF/NOPB Datasheet(PDF) 18 Page - Texas Instruments