AN521:Introduction of AS500x Oscillator Frequency Stability
■The AS500x is a silicon-based reference clock generator. Figure 1.1shows the block diagram: an LC oscillator (LCO) provides the clock input to a low-noise digitally controlled fractional-N frequency generator (FRAC-N); a driver block (DRV) with programmable multi-format outputs conditions the FRAC-N signal for export off-chip. The LCO if left uncompensated, is susceptible to changes in frequency due to environmental variables such as the ambient temperature, supply voltage, and humidity. Additionally, thermal stress incurred during solder-reflow causes large, relatively fast, thermal transients that can result in a frequency shift. This application not quantitatively describes the AS500x’s unique but predictable frequency-stability response relative to various environmental stresses and conditions. With the proprietary on-chip compensation scheme, AS500xmaintains its output frequency within ±50ppm of its target value overall such environmental conditions during the operating lifetime.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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May 2021 |
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Rev 1.0 |
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AN521 |
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1.1 MB |
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