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i2c可编程任意频率的CMOS时钟发生器VCXO,SI5351B-B-GMR
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The Si5351 is an I2C configurable clock generator that is ideally suited for replacing crystals， crystal oscillators， VCXOs， phase-locked loops （PLLs）， and fanout buffers in cost-sensitive applications. Based on a PLL/VCXO + high resolution MultiSynth fractional divider architecture， the Si5351 can generate any frequency up to 200 MHz on each of its outputs with 0 ppm error. Three versions of the Si5351 are available to meet a wide variety of applications. The Si5351A generates up to 8 free-running clocks using an internal oscillator for replacing crystals and crystal oscillators. The Si5351B adds an internal VCXO and provides the flexibility to replace both free-running clocks and synchronous clocks. It eliminates the need for higher cost， custom pullable crystals while providing reliable operation over a wide tuning range. The Si5351C offers the same flexibility but synchronizes to an external reference clock （CLKIN）.
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