Voltage controlled crystal oscillators

The NBVSPAXXX range of clock modules have been designed to meet the requirements set by modern 3.3V low voltage differential signalling (LVDS) clock generation applications and are targeted for use in communications infrastructure such as network routers, switches, servers, and base stations. The devices are said to utilise a high Q fundamental mode pullable crystal and phase locked loop (PLL) multiplier to provide all industry standard output clock frequencies. According to the company, supported frequencies include 156.25MHz for the NBVSPA017 device, 155.52MHz for the NBVSPA018, 125.00MHz for the NBVSPA019, 160.00MHz for the NBVSPA024, 148.50MHz for the NBVSPA027, and 74.25MHz for the NBVSPA042. Custom frequency versions are also said to be available on request, covering frequencies from 60 to 700MHz. The new devices are claimed to have a pullable range of 100 parts per million (ppm), an orderable frequency stability of 50 ppm and a typical jitter of 0.5 picoseconds (ps) across the 12kHz to 20 MHz frequency range. They are also said to have a typical output rise time (20% to 80%) of 245ps. According to ON Semiconductor, the range has an industrial operating temperature range of -40 to 85 °C and is fully compliant with the MIL-STD-833 standard in terms of shock, vibration and thermal ruggedness.