LMV7219M5/NOPB National Semiconductor, LMV7219M5/NOPB Datasheet - Page 10

• Manufacturer Part Number: LMV7219M5/NOPB
• Description: IC COMPARATOR R-R OUT SOT23-5
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: General Purposer

Specifications of LMV7219M5/NOPB

• Number Of Elements: 1
• Output Type: Push-Pull, Rail-to-Rail
• Voltage - Supply: 2.7 V ~ 5 V
• Mounting Type: Surface Mount
• Package / Case: SC-74A, SOT-753
• Comparator Type: High Speed
• No. Of Comparators: 1
• Response Time: 7ns
• Ic Output Type: Push Pull
• Supply Current: 1.1mA
• Supply Voltage Range: 2.7V To 5V
• Amplifier Case Style: SOT-23
• Rohs Compliant: Yes
• Number Of Elements: 1
• Technology: BiCMOS
• Input Offset Voltage: 6mV
• Input Bias Current (typ): 950nA
• Single Supply Voltage (typ): 3V
• Dual Supply Voltage (typ): Not RequiredV
• Supply Current (max): 1.8@5VmA
• Power Supply Requirement: Single
• Common Mode Rejection Ratio: 85dB
• Power Supply Rejection Ratio: 85dB
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 5
• Package Type: SOT-23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMV7219M5; LMV7219M5TR

www.national.com
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