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NJM2555
622MHz VCXO IC
sPACKAGE OUTLINE sGENERAL DESCRIPTION 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 NJM2555C-C NJM2555V LVPECL equivalent. The 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. sFEATURES qOperating Voltage qFrequency range of Crystal qOutput Frequency Range qOutput Level qA Variable Capacitor on chip qBipolar Technology qPackage
+3.0V to +3.6V 155.52 MHz typ. (120 to 160 MHz) 622.08 MHz typ. (480 to 640 MHz) differential LVPECL equivalent
Die and SSOP-10 sCOORDINATES 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 3 2
sTERMINAL DESCRIPTION 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] sBLOCK DIAGRAM
VOSC
6
7
8
9
10
1 2 3 4 5
10 9 8 7 6
VCC
XT1 XT2
OSC
BUFFER AMP
HIGH PASS FILTER
LIMITER AMP
T2 T1
VVC FOUT2 GND OUTPUT BUFFER FOUT1
Version 3.6 2003/08/22 ( 1 / 3 )
NJM2555
sABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range sELECTRICAL CHARACTERISTICS Parameter Symbol Supply Voltage VCC Operating Current ICC Power Consumption PD Maximum VC Range VCONTH Minimum VC Range VCONTL sREFERENTIAL DATA Parameter Output Frequency Symbols VCC PD Topr Tstg Ratings -0.3 to 5.0 250 (SSOP-10) -40 to +85 -55 to +125 (Ta=25C) Unit V mW C C (Ta=25C) Unit V mA mW V V
Conditions FOUT=622MHz FOUT=622MHz -
MIN. 3.0 40 120 VCC-0.3 -0.3
TYP. 3.3 50 165 VCC 0
MAX. 3.6 60 216 VCC+0.3 0.3
Symbol FOUT
Frequency Pull Range FCONT 90 100 Output Level POUT -1.5 1.5 Lower & Higher FDU 50 ohm load Note 2) -20 -25 Harmonics D/U Ratio Symmetry SYM 50 ohm load 45 50 Jitter JITTER 50 ohm load 5 9 Note 1) Frequency Pull Range is determined by using 155.5MHz quartz crystal. The parameters are as follows; L1=0.135mH, R1=15.22, C1=7.72fF, Co=2.3pF L1 Note 2) Tunable Filters are connected at T1 & T2 terminals.
Conditions Min.: 120MHz crystal Typ.: 155.5MHz crystal Max.: 160MHz crystal Note 1) 50 ohm load
Min. 480
(VCC=VOSC=3.3V, Ta=25C) Typ. Max. Unit 622 640 120 4.5 55 16 MHz ppm dBm dBc % ps rms
R1 Co
C1
sTEST CIRCUIT & BLOCK DIAGRAM
VCC VOSC 1 1nF VCC
XT1 X'tal 180nH XT2 OSC Buffer AMP High Pass Filter LIMITER AMP
T2 13.6p T1 5pF 12nH
VVC VVC 1nF GND Output Buffer
FOUT2 1000pF 1000pF FOUT1
FOUT
1nF 1000pF
(Type: 033) (Type: 1005)
Version 3.6 2003/08/22 ( 2 / 3 )
NJM2555
sTERMINAL INFORMATION No. Symbol 2, 3, XT1, XT2, Equivalent Circuit Comment
and 4
and VVC
6, 7,
FOUT1, FOUT2,
8, 9,
T1, T2,
[CAUTION] The specifications on this data book are only given for information , without any guarantee as regards either mistakes or omissions. The application 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 3.6 2003/08/22 ( 3 / 3 )

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