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LMV393-S08-R Datasheet(PDF) 7 Page - Unisonic Technologies |
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LMV393-S08-R Datasheet(HTML) 7 Page - Unisonic Technologies |
7 / 11 page LMV393 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 7 of 11 www.unisonic.com.tw QW-R104-004,A APPLICATION CIRCUITS(Cont.) Free Running Multivibrator This oscillator circuit can generate a train of stable clock for precise timekeeping applications. We can obtain it by using a resonator as the feedback component. A quartz crystal in its series-resonant mode can make the circuit oscillating well. For the comparator be switching symmetrically about +VCC/2, the value of R1 and R2 must choose equal. The RC time constant of R3 and C1 is set to be several times greater than the period of the oscillating frequency. When choose crystal, be sure to order series resonant with desired temperature coefficient. Pulse generator with variable duty cycle: A pulse generator with variable duty cycle can be obtained by creating two separated paths for C1 charge and discharge into the basic square wave generator. One path, through R2 and D2 will charge the capacitor and set the pulse width (t1). The other path, R1 and D1 will discharge the capacitor and set the time between pulses (t2). Varying resistor R1, R2 can alter the time between pulses and the pulse width. Both controls also change the frequency of the generator. The pulse width and time between pulses can be found from: 14 1 1max (1 ) tR C VV e − =− Rise time 25 1 1max tR C VV e − = Fall time Where max 2 3 CC V V = And max 1 33 CC VV V == then 14 1 1 2 tR C e − = t2 is then given by: 25 1 1 2 tR C e − = |
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