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Check the listing for details. ADUM OCXO-3166 USB Data Isolator ADUM3166 (Main Unit + 9V Switch Power Supply). Condition: New. Listed at 123.59 USD. This is an upgraded version of the original ADUM4166 USB isolator. The OCXO and top frequency synthesizer chip SI5341 are upgraded for use with the isolator chip and data reorganizer. Its built-in SC-cut OCXO has a phase noise performance of -100dBc/Hz (1Hz).