Ultra-Low Phase Noise Oscillators Crystek Corporation Ultra-Low Phase Noise Oscillators come in two different package sizes such as the CCHD-957 and CCHD-575. The CCHD-957 ultra-low phase noise Oscillators are designed specifically for High-Definition audio (HD audio). These oscillators feature a typical low close-in phase noise of -100dBc/Hz at 10 Hz offset and a noise floor of -169dBc/Hz. The CCHD-957 oscillators come with a 'Standby Function' that shuts down the internal oscillator in addition to the output buffer being placed in Tri-State. Crystek Corporation Ultra-Low Phase Noise Oscillators are housed in a 9mm × 14 mm SMT package and operate with a +3.3V power supply.