LMV7219M5 National Semiconductor, LMV7219M5 Datasheet - Page 10

• Manufacturer Part Number: LMV7219M5
• Description: IC,VOLT COMPARATOR,SINGLE,BICMOS,TSOP,5PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LMV7219M5

• Rohs Compliant: NO
• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No

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Crystal Oscillator
A simple crystal oscillator using the LMV7219 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
offset.
FIGURE 5. Crystal Oscillator
10105424
10
IR Receiver
The LMV7219 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 RD. When this voltage level cross the voltage
applied by the voltage divider to the inverting input, the
output transitions.
FIGURE 6. IR Receiver
10105425