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LMV7235 Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LMV7235
Description  45ns, Ultra Low Power, Low Voltage, Rail-to-Rail Input Comparator with Open-Drain/Push-Pull Output
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

LMV7235 Datasheet(HTML) 10 Page - National Semiconductor (TI)

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Application Section (Continued)
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 0V, the compara-
tor’s output changes state.
Threshold Detector
Instead of tying the inverting input to 0V, the inverting input
can be tied to a reference voltage. The non-inverting input is
connected to the input. As the input passes the V
REF thresh-
old, the comparator’s output changes state.
Crystal Oscillator
A simple crystal oscillator using the LMV7239 is shown
below. Resistors R1 and R2 set the bias point at the com-
parator’s non-inverting input. Resistors R3, R4 and C1 sets
the inverting input node at an appropriate DC average level
based on the output. The crystal’s path provides resonant
positive feedback and stable oscillation occurs. The output
duty cycle for this circuit is roughly 50%, but it is affected by
resistor tolerances and to a lesser extent by the comparator
IR Receiver
The LMV7239 is an ideal candidate to be used as an infrared
receiver. The infrared photo diode creates a current relative
to the amount of infrared light present. The current creates a
voltage across R
D. When this voltage level cross the voltage
applied by the voltage divider to the inverting input, the
output transitions.
FIGURE 3. Zero-Crossing Detector
FIGURE 4. Threshold Detector
FIGURE 5. Crystal Oscillator
FIGURE 6. IR Receiver

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