NJM2555 622MHz VCXO IC ■ General Description ■ Package Outline The NJM2555 is a 622.08MHz VCXO (Voltage Controlled Crystal Oscillator) IC designed for optical fiber telecommunication systems, using NewJRC superior Bipolar technology, which consists of an oscillation amplifier, a variable capacitor diode, a quadruple (x4) frequency circuit, high pass filter, and limiter amplifier. The NJM2555 generate x4 frequency to add the only 155.52MHz crystal and LC filter, and the output is differential LVPECL equivalent. The NJM2555C-C recommended input crystal frequency is from 120 to 160 MHz. The jitter performance and phase noise is very low based on excellent oscillation circuit. This can be applied to optical communication, especially the WDM system. ■ Features ●Operating Voltage: +3.0V to +3.6V ●Frequency range of Crystal: 155.52 MHz typ. (120 to 160 MHz) ●Output Frequency Range:622.08 MHz typ. (480 to 640 MHz) ●Output Level: differential LVPECL equivalent ●A Variable Capacitor on chip ●Bipolar Technology ●Package: Die ■ Terminal Description & Coordinates No. Symbol Function 1 VOSC OSC Supply Voltage 2 XT1 Quartz Crystal Connecting terminal 1 3 XT2 Quartz Crystal Connecting terminal 2 4 VVC Frequency Control 5 GND GND=0V 6 FOUT1 Frequency Output 1 7 FOUT2 Frequency Output 2 8 T1 Tunable Filter Terminal 1 9 T2 Tunable Filter Terminal 2 10 VCC VCC=3.3V Starting Point: Die Center Chip Size: 1.60x2.00 [mm] Chip Thickness: 260 ±20 [um] Pad Size: 90x90 [um] X 550 140 -80 -435 -635 -635 -395 165 405 635 Y 835 835 835 835 835 -835 -835 -835 -835 -835 unit: [um] 5 4 6 7 3 2 8 １ 9 10 ■ Block Diagram VCC VOSC XT1 XT2 OSC BUFFER AMP HIGH PASS FILTER T2 T1 LIMITER AMP VVC FOUT2 GND OUTPUT BUFFER FOUT1 Version 3.3 2002/09/26 (1/2) NJM2555 ■ Absolute Maximum Ratings (Ta=25°C) Parameter Symbols Ratings Unit Supply Voltage VCC -0.3 to 5.0 V Operating Temperature Range Topr -40 to +85 °C Storage Temperature Range Tstg -55 to +125 °C ■Electrical Characteristics (Ta=25°C) Parameter Symbol Conditions MIN. TYP. MAX. Unit Supply Voltage VCC 3.0 3.3 3.6 V Operating Current ICC FOUT=622MHz 40 50 60 mA Power Consumption PD FOUT=622MHz 120 165 216 mW Maximum VC Range VCONTH VCC-0.3 VCC VCC+0.3 V Minimum VC Range VCONTL -0.3 0 0.3 V ■ Referential Data (VCC=VOSC=3.3V, Ta=25°C) Parameter Symbol Conditions Min. Typ. Max. Unit Min.: 120MHz crystal Output Frequency FOUT Typ.: 155.5MHz crystal 480 622 640 MHz Max.: 160MHz crystal Frequency Pull Range FCONT Note 1) ppm ±90 ±100 ±120 Output Level POUT 50 ohm load -1.5 1.5 4.5 dBm Lower & Higher FDU 50 ohm load Note 2) -20 -25 dBc Harmonics D/U Ratio Symmetry SYM 50 ohm load 45 50 55 % Jitter JITTER 50 ohm load 5 9 16 ps rms Note 1) Frequency Pull Range is determined by using 155.5MHz quartz crystal. The parameters are as follows; L1 C1 R1 Co L1=0.135mH, R1=15.22Ω, C1=7.72fF, Co=2.3pF Note 2) Tunable Filters are connected at T1 & T2 terminals. [CAUTION] The specifications on this data book are only given for information, without any guarantee as regards either mistakes or omissions. The applications circuits in this data book are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Version 3.3 2002/09/26 (2/2)