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LMV762QMAX Datasheet(PDF) 14 Page - Texas Instruments |
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LMV762QMAX Datasheet(HTML) 14 Page - Texas Instruments |
14 / 25 page -1 0 1 2 3 4 5 6 0 10 20 30 40 50 TIME (µs) C001 VOUT Va Vc CC 2 3 A2 1 2 3 V (R R ) V R (R R ) R R CC 2 A1 2 1 3 V R V R R R ˜ R LMV761, LMV762, LMV762Q-Q1 SNOS998I – FEBRUARY 2002 – REVISED OCTOBER 2015 www.ti.com Typical Application (continued) Consider the output of Figure 23 is high to analyze the circuit. That implies that the inverted input (VC) is lower than the noninverting input (VA). This causes the C1 to be charged through R4, and the voltage VC increases until it is equal to the noninverting input. The value of VA at this point is calculated by Equation 4: (4) If R1 = R2 = R3, then VA1 = 2 VCC / 3 At this point the comparator switches pulling down the output to the negative rail. The value of VA at this point is calculated by Equation 5: (5) If R1 = R2 = R3, then VA2 = VCC / 3. The capacitor C1 now discharges through R4, and the voltage VC decreases until it is equal to VA2, at which point the comparator switches again, bringing it back to the initial stage. The time period is equal to twice the time it takes to discharge C1 from 2 VCC / 3 to VCC / 3, which is given by R4C1 × ln2. Hence, the formula for the frequency is calculated by Equation 6: F = 1 / (2 × R4 × C1 × ln2) (6) 8.2.3 Application Curve Figure Figure 25 shows the simulated results of an oscillator using the following values: • R1 = R2 = R3 = R4 = 100 kΩ • C1 = 100 pF, CL = 20 pF • V+ = 5 V, V– = GND • CSTRAY (not shown) from Va to GND = 10 pF Figure 25. Square-Wave Oscillator Output Waveform 14 Submit Documentation Feedback Copyright © 2002–2015, Texas Instruments Incorporated Product Folder Links: LMV761 LMV762 LMV762Q-Q1 |
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