LMV7219M7SLASHNOPB datasheet(13/27 Pages) TI1

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LMV7219

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SNOS458I – APRIL 2000 – REVISED JUNE 2016

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Typical Application (continued)

R3 = VCC - VREF /IF

(2)

When VOUT = VCC:

2. Choose a hysteresis band required (VHB).

3. Calculate R1, where R1 = R3 X(VHB/VCC)

4. Choose the trip point for VIN rising. This is the threshold voltage (VTHR) at which the comparator switches from

low to high as VIN rises about the trip point.

5. Calculate R2 as follows:

(3)

6. Verify the trip voltage and hysteresis as follows:

(4)

This method is recommended for additional hysteresis of up to a few hundred millivolts. Beyond that, the

impedance of R3 is low enough to affect the bias string and adjustment of R1 may be also required.

8.2.2.2 Zero-Crossing Detector

The inverting input is connected to ground and the non-inverting input is connected to 100mVp-p signal. As the

signal at the non-inverting input crosses 0 V, the comparator's output Changes State.

Figure 15. Zero-Crossing Detector

8.2.2.3 Threshold Detector

Instead of tying the inverting input to 0 V, the inverting input can be tied to a reference voltage. The non-inverting

input is connected to the input. As the input passes the VREF threshold, the comparator's output changes state.

LMV7219M7/NOPB Datasheet(PDF) 13 Page - Texas Instruments