LPV7215MG/NOPB National Semiconductor, LPV7215MG/NOPB Datasheet - Page 15

• Manufacturer Part Number: LPV7215MG/NOPB
• Description: IC COMP 1.8V P-P R-R I/O SC70-5
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: General Purposer

Specifications of LPV7215MG/NOPB

• Number Of Elements: 1
• Output Type: MOS, Push-Pull, Rail-to-Rail
• Voltage - Supply: 1.8 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 6-TSSOP (5 lead), SC-88A, SOT-353
• Comparator Type: General Purpose
• No. Of Comparators: 1
• Response Time: 4.5µs
• Ic Output Type: Push Pull
• Supply Current: 580nA
• Supply Voltage Range: 1.8V To 5.5V
• Amplifier Case Style: SC-70
• Rohs Compliant: Yes
• Number Of Elements: 1
• Technology: CMOS
• Input Offset Voltage: 3mV
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Supply Current (max): 0.00103@5VmA
• Power Supply Requirement: Single
• Common Mode Rejection Ratio: 98dB
• Voltage Gain In Db: 120dB
• Power Supply Rejection Ratio: 82dB
• Single Supply Voltage (min): 1.8V
• Single Supply Voltage (max): 5.5V
• 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: SC-70
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LPV7215MG; LPV7215MGTR

THRESHOLD DETECTOR
Instead of tying the inverting input to 0V, the inverting input
can be tied to a reference voltage. As the input on the non-
inverting input passes the V
output changes state. It is important to use a stable reference
voltage to ensure a consistent switching point.
CRYSTAL OSCILLATOR
A simple crystal oscillator using the LPV7215 is shown in
Figure 8. Resistors R
comparator’s non-inverting input. Resistors, R
capacitor C
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 af-
fected by resistor tolerances and to a lesser extent by the
comparator offset.
IR RECEIVER
The LPV7215 can also 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
the voltage divider to the inverting input, the output transitions.
D
. When this voltage level crosses the voltage applied by
1
set the inverting input node at an appropriate DC
FIGURE 7. Threshold Detector
FIGURE 8. Crystal Oscillator
1
and R
REF
2
threshold, the comparator’s
set the bias point at the
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3
and R
4
and
15
SQUARE WAVE GENERATOR
A typical application for a comparator is as a square wave
oscillator. The circuit in Figure 10 generates a square wave
whose period is set by the RC time constant of the capacitor
C
large signal propagation delay of the comparator and by the
capacitive loading at the output, which limits the output slew
rate.
1
and resistor R
FIGURE 10. Square Wave Oscillator
4
. The maximum frequency is limited by the
FIGURE 9. IR Receiver
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