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LMV331M7/NOPB 数据表(PDF) 18 Page - Texas Instruments |
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LMV331M7/NOPB 数据表(HTML) 18 Page - Texas Instruments |
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18 / 38 page ![]() LMV331-N, LMV339-N, LMV393-N SNOS018H – AUGUST 1999 – REVISED DECEMBER 2014 www.ti.com Typical Applications (continued) 8.2.2 Crystal Controlled Oscillator Figure 23. Crystal Controlled Oscillator A simple yet very stable oscillator that generates a clock for slower digital systems can be obtained by using a resonator as the feedback element. It is similar to the squarewave oscillator, except that the positive feedback is obtained through a quartz crystal. The circuit oscillates when the transmission through the crystal is at a maximum, so the crystal in its series-resonant mode. The value of R1 and R2 are equal so that the comparator will switch symmetrically about +VCC/2. The RC constant of R3 and C1 is set to be several times greater than the period of the oscillating frequency, insuring a 50% duty cycle by maintaining a DC voltage at the inverting input equal to the absolute average of the output waveform. When specifying the crystal, be sure to order series resonant with the desired temperature coefficient. 18 Submit Documentation Feedback Copyright © 1999–2014, Texas Instruments Incorporated Product Folder Links: LMV331-N LMV339-N LMV393-N |
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