November 25, 2013 Nihon Dempa Kogyo Co., Ltd. President: Hiroshi Takeuchi New product developed； VCXO (size: 7 × 5 mm; SMD type) enabling customers to set the desired output frequency for optical communications Nihon Dempa Kogyo Co., Ltd. (NDK) has developed a new voltage-controlled crystal oscillator (VCXO) (model: NV7050SH; 7.0 × 5.0 × 1.6 mm). The product allows customers to set the desired output frequency within the range of 15 to 915 MHz after delivery (*1) and is characterized by low phase noise and low jitter as required in VCXOs for superior communication quality in optical communications. Optical communications, such as backbone networks, metro networks and CATV, have enabled faster and higher-capacity data transmission over distances of several hundred kilometers with optical transmission devices operating at different transmission rates. Therefore, different VCXOs with a specific frequency for each transmission rate were required. As a result, a number of challenges have arisen in the field: Multiple devices for different transmission rates make customer’s parts management complex. When changing transmission rates, delivery of VCXOs takes time after order placement and additional work of part replacement. To address these challenges, NDK has developed the new VCXO that customers can set the desired output frequency for themselves, using NDK’s advanced crystal oscillator technology and digital PLL-IC. This new product represents a significant contribution to maintenance and improvement of optical communication quality, standardization of optical transmission device substrates, reduction of the load and waste in parts management, and speedy changes in transmission rates. Engineering sample delivery is scheduled for this month, and the start of mass production is scheduled for January 2014. *1: The desired frequency can be selected by writing a present value in a register by I2C communication. Appearance Specifications and characteristics Model NV7050SH Outer dimensions 7.0×5.0×1.6 mm Frequency range 15～915 MHz Supply voltage 3.3 V±10 % Control voltage 0～3.3 V Operating temperature range -40～+85 °C Current consumption Max. 175 mA Overall frequency tolerance *1 Max. ±50 ppm Output level LVPECL Absolute pull range (APR)*2 Min. ±100 ppm Typ. -50 dBc/Hz @ 100 Hz Typ. -79 dBc/Hz @ 1 kHz Phase noise Typ. -100 dBc/Hz @ 10 kHz (＠622.08MHz) Typ. -119 dBc/Hz @ 100 kHz Typ. -125 dBc/Hz @ 1 MHz Typ. -158 dBc/Hz @ 10 MHz Phase jitter (＠622.08MHz) Max. 0.6 ps (12 kHz～20 MHz) *1：Overall frequency tolerance = Frequency tolerance + Frequency/temperature characteristics + Frequency/voltage coefficient + Long-term frequency stability *2： Absolute pull range (APR) = Frequency control range - Overall frequency tolerance <Contact> Sales representative / Nihon Dempa Kogyo Co., Ltd. e-Mail : [email protected]