Low Power 32KHz Crystal Oscillator (CLN12FFC)

  • 低功耗32KHz晶体振荡器(TSMC12nm FFC)





Crystal Oscillator pad macro that supports industry standard 32KHz crystal

· Uses standard CMOS transistors

· Crystal Oscillation Mode: Fundamental

· Power down option for IDDQ testing

· Oscillator by-pass mode option for logic testing

· Self-contained ESD protection structure


General Description


High end consumer and professional applications require crystals with a minimum number of external components. These applications typically operate under severe noise environment of large digital video processing chips. A standard crystal oscillator pad provided in commodity libraries induces high noise and jitter. Analog Bits has developed a unique low noise Crystal Oscillator macro based on a proprietary architecture that is in volume production in several high end graphics and multi-media applications. This differentiated architecture has earned outstanding reviews on high volume production boards.


Typical Usage and Block Diagram


 Figure 1 shows the block diagram of the Crystal Oscillator Pad. The macro has a power down control bit that allows to enable a low current state for IDDQ testing. The macro has the inherent capability of bypassing the crystal oscillator circuit by directly feeding the XTAL_IN pin from an external clock generator. In that mode the external clock applied on XTAL_IN pin will go directly to the output (XOUT) of the crystal oscillator macro without any modification. The input threshold will be close to VDDA/2 in this bypassed mode.


Block Diagram


A LOCK signal is provided to indicate a good crystal frequency is available. It goes high after it has counted a preset number of cycles with ENABLE high and PD low, and then it stays high until the next disable or powerdown.




Table 1:  Specifications


Pin Description


Table 2: Pin Description


Deliverables and EDA Design Views




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