PDF M908-01 Data sheet ( Hoja de datos )

Número de pieza	M908-01
Descripción	Vcso-based Gbe Clock Generator
Fabricantes	Integrated Circuit System
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No Preview Available ! Integrated Circuit Systems, Inc. Preliminary Information M908-01 VCSO BASED GBE CLOCK GENERATOR GENERAL DESCRIPTION The M908-01 is a PLL (Phase Locked Loop) based clock generator that uses an internal VCSO (Voltage Controlled SAW Oscillator) to produce a very low jitter output clock. It is ideal for Gigabit Ethernet. An output clock frequency of 156.25MHz (with the M908-01-156.2500) is provided from eight LVPECL clock output pairs. The accuracy of the output frequency is assured by the internal PLL that phase-locks the internal VCSO to the reference input frequency (25MHz for the M908-01-156.2500). The input reference can either be an external crystal, utilizing the internal crystal oscillator, or a stable external clock source such as a packaged crystal oscillator. PIN ASSIGNMENT (9 x 9 mm SMT) XTAL_2 FOUT6 nFOUT6 FOUT7 nFOUT7 VCC DNC DNC DNC 28 29 30 31 M 9 0 8 - 0 1 32 33 ( T o p V i e w ) 34 35 36 18 17 16 15 14 13 12 11 10 nFOUT2 FOUT2 nFOUT1 FOUT1 GND nFOUT0 FOUT0 VCC GND FEATURES ◆ 156.25MHz output clock frequency (M908-01-156.2500) ◆ Eight identical LVPECL output pairs ◆ Jitter 0.7ps RMS (over 12kHz-20MHz) ◆ Ideal for Gigabit Ethernet clock reference ◆ Output-to-output skew < 100ps ◆ External XTAL or LVCMOS reference input ◆ Integrated SAW (surface acoustic wave) delay line ◆ Single 3.3V power supply ◆ Small 9 x 9 mm SMT (surface mount) package Figure 1: Pin Assignment Output Frequency Configuration (M908-01-156.25) Ref Clock Frequency http://www.DataSheet4U.net/ (MHz) PLL Ratio Output Frequency (MHz) Application 25 25/4 156.25 Gigabit Ethernet Table 1: Output Frequency Configuration (M908-01-156.25) SIMPLIFIED BLOCK DIAGRAM M908-01-156.25 External Crystal or Reference Clock Input (25MHz) XTAL OSC Divider VSCO Frequency Multiplying PLL External Loop Filter FOUT7 nFOUT7 FOUT6 nFOUT6 FOUT5 nFOUT5 FOUT4 LVPECL nFOUT4 Output FOUT3 Clock Pairs nFOUT3 (156.25MHz) FOUT2 nFOUT2 FOUT1 nFOUT1 FOUT0 nFOUT0 Figure 2: Simplified Block Diagram M908-01 Datasheet Rev 1.2 Revision 013003 M908-01 VCSO Based GbE Clock Generator Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400 datasheet pdf - http://www.DataSheet4U.net/ 1 page Integrated Circuit Systems, Inc. M908-01 VCSO BASED GBE CLOCK GENERATOR Preliminary Information ELECTRICAL SPECIFICATIONS DC Characteristics Unless stated otherwise, VCC = 3.3 Volts + 5%, TA = 0 oC to 70 oC, Output Frequency=156.25MHz1, Outputs terminated with 50Ω to VCC - 2V Symbol Parameter Min Typ Max Unit Power Supply VCC Positive Supply Voltage 3.135 3.3 3.465 V ICC Power Supply Current 350 mA Reference Clock Input VIH VIL IIH Input High Voltage Input Low Voltage Input High Current (Vcc / 2 ) +0.5 XTAL_1 / REF_IN (XTAL_2 disconnected) -0.3 Vcc +0.3 V (Vcc / 2 ) +0.5 V 150 µA IIL Input Low Current -5.0 µA Crystal or Reference Clock Input CIN Input Capacitance XTAL_1 / REF_IN 4 pF Differential VOH Output High Voltage Output VOL Output Low Voltage FOUT, nFOUT (0-7) VP-P Peak to Peak Output Voltage Note 1: For other VCSO center frequencies, contact ICS Vcc -1.4 Vcc -2.0 0.6 Vcc -1.0 V Vcc -1.7 V 0.85 V Table 6: DC Characteristics AC Characteristics Unless implied otherwise, VCC = 3.3 Volts + 5%, TA = 0 oC to 70 oC, Output Frequency=156.25MHz1, Outputs terminated with 50Ω to VCC - 2V Symbol Parameter http://www.DataSheet4U.net/ Min Typ Max Unit Test Conditions FOUT Output Frequency Range 75 156.25 175 MHz FIN Nominal Input Frequency, XTAL_1 / REF_IN 25 MHz APR VCSO Pull-Range +100 +150 ppm Φn Single Side Band Phase Noise @156.25MHz J(t) Jitter (rms) 1kHz Offset 10kHz Offset 100kHz Offset -100 dBc/Hz -110 dBc/Hz -134 dBc/Hz 0.7 1.0 ps 12kHz to 20MHz tDC Output Duty Cycle, High Time tR Output Rise Time FOUT, nFOUT (0-7) tF Output Fall Time FOUT, nFOUT (0-7) tS Output Skew Between Any Pair Note 1: For other VCSO center frequencies, contact ICS 45 350 350 50 450 450 55 % 550 ps 20% to 80% 550 ps 20% to 80% 100 ps Table 7: AC Characteristics M908-01 Datasheet Rev 1.2 5 of 6 Revision 013003 Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400 datasheet pdf - http://www.DataSheet4U.net/ 5 Page

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