ZHCSI24O September 2000 – April 2018 LMV7235 , LMV7239
PRODUCTION DATA.
8.2.4 Window Detector
Figure 30. 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 31. 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:
Equation 11. VREF1 = R3/R1+R2+R3) × V+
Equation 12. VREF2 = R2+R3)/R1+R2+R3) × V+
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 LMV7235 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.