V

+

VREF2

VREF1

BOTH OUTPUTS

ARE HIGH

OUTPUT A

OUTPUT B

VIN

V

+

R1

R2

R3

-

+

-

+

OUTPUT A

OUTPUT B

VREF2

VREF1

A

B

VIN

LMV7271, LMV7272, LMV7275

www.ti.com

SNOSA56I – FEBRUARY 2003 – REVISED SEPTEMBER 2015

Typical Applications (continued)

8.2.4 Window Detector

Figure 40. Window Detector

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

true (high) when VREF1 < VIN < VREF2

Figure 41. Window Detector Output Signal

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+

(10)

VREF2 = R2 + R3) / R1 + R2 + R3) × V+

(11)

To determine if the input signal falls outside of the two voltage levels, both inputs on each comparators can be

reversed to invert the logic.

The LMV7275 with an open-drain output should be used if the outputs are to be tied together for a common logic

output.

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

Copyright © 2003–2015, Texas Instruments Incorporated

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