Nippon Precision Circuits (abbreviated NPC; President: Mr. Tabuchi) announce the introduction of two series of high-frequency crystal oscillator ICs for network equipment--the CMOS-output CF5005B series and the differential LVPECL-output CF5034 series. NPC is currently shipping volume production CF5005B series and sample production CF5034 series.

In network-related equipment where the transmission speed is most prominent, high-frequency low-jitter clock sources are essential in order to provide stable transmission and reception. High-frequency clocks can be generated using multipliers employing PLL circuits, however, these clock sources typically have difficulties simultaneously satisfying both the high frequency and low jitter requirements.

NPC developed the CF5005B series and CF5034 series with the purpose of creating high-frequency low-jitter crystal oscillator clock sources. Both series provide stable oscillation using a high-frequency crystal oscillating element, allowing low-jitter stable clock sources to be generated.

The CF5005B series are 125MHz to 165MHz 3rd-order overtone frequency oscillator ICs. The oscillator and output circuits have been optimized to operate in the 125MHz to 165MHz frequency band, using techniques gleaned from previous device development, with stable oscillation and low jitter. Capacitors with excellent frequency response and high-precision thin-film resistors with good temperature characteristics, integrated using NPC's proprietary Molybdenum-gate CMOS process, provide stable 3rd-order overtone oscillation, even in this high-frequency range.

The CF5034 series, however, are made using a recently developed BiCMOS process that allows high-frequency oscillator circuits and differential LVPECL output circuits to be fabricated on a single chip. These devices are available in two versions--an 80MHz to 330MHz fundamental frequency oscillator circuit version and an 80MHz to 160MHz 3rd-order overtone frequency oscillator circuit version. This process means that differential LVPECL-output high-frequency crystal oscillator devices can be made available in surface-mounting miniature ceramic packages.

NPC pledges to continue to develop stable crystal oscillator circuit devices for uses in high-frequency applications.