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Xicor X1243实时时钟振荡器的要求.pdf
消耗积分:3 |
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大小:27 |
2009-05-22
刘芳
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With any Real Time Clock, there needs to be a quartz
crystal controlling the oscillator frequency. This is necessary,
because variations of even 20 parts per million in the
oscillator frequency result in a clock that is off by almost a
minute a month. Typically this oscillator consists of an
inverting amplifier and a 32.768kHz crystal network. The
constraints on this oscillator circuit are many. It should:
crystal controlling the oscillator frequency. This is necessary,
because variations of even 20 parts per million in the
oscillator frequency result in a clock that is off by almost a
minute a month. Typically this oscillator consists of an
inverting amplifier and a 32.768kHz crystal network. The
constraints on this oscillator circuit are many. It should:
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