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| Integrated Circuit Systems, Inc. Product Brief M906-02 VCSO BASED CLOCK GENERATOR GENERAL DESCRIPTION The M906-02 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. An output clock frequency of 155.52MHz or 77.76MHz is provided from six LVPECL clock output pairs. The accuracy of the output frequency is assured by the internal PLL that phase-locks the internal VCSO to the 19.44MHz frequency reference input. The input reference can either be an external crystal, utilizing the internal crystal oscillator, or a stable external clock source such as a canned crystal oscillator. PIN ASSIGNMENT (9 x 9 mm SMT) XTAL_1 / REF_IN GND STOP EXT_CLK EN_EXT_CLK FOUT_SEL nFOUT3 FOUT3 VCC 27 26 25 24 23 22 21 20 19 FEATURES * 155.52MHz or 77.76MHz output clock frequency * * * * * * * * * * (For other output frequencies, consult factory) Six identical LVPECL output pairs Low jitter 0.7ps rms (over 12kHz-20MHz) Ideal for OC-48/STM-16 clock reference Output-to-output skew < 250ps 19.44MHz XTAL or LVCMOS reference input Selectable external feed-through clock input STOP clock input (Logic 1 stops output clocks) Integrated SAW (surface acoustic wave) delay line Single 3.3V power supply Small 9 x 9 mm SMT (surface mount) package XTAL_2 FOUT4 nFOUT4 FOUT5 nFOUT5 VCC DNC DNC DNC 28 29 30 31 32 33 34 35 36 M906-02 (Top View) 18 17 16 15 14 13 12 11 10 nFOUT2 FOUT2 nFOUT1 FOUT1 GND nFOUT0 FOUT0 VCC GND Example Output Frequency Configurations Ref Clock Frequency (MHz) 19.44 VCSO Frequency (MHz) 155.52 P Divider Value 1 2 Output Frequency (MHz) 155.52 77.76 BLOCK DIAGRAM RLOOP CLOOP RPOST CPOST CPOST RLOOP CLOOP RPOST nOP_OUT nVC VC External Loop Filter Components M906-02 Phase Detector OP_IN nOP_IN OP_OUT XTAL_1 / REF_IN XTAL_2 RIN SAW Delay Line GND GND GND OP_IN nOP_OUT nVC VC OP_OUT nOP_IN 1 2 3 4 5 6 7 8 9 XTAL OSC RIN Loop Filter Amplifier Phase Shifter VCSO FOUT5 nFOUT5 P Divider P = 1 or 2 O 1 FOUT4 nFOUT4 FOUT3 nFOUT3 FOUT2 nFOUT2 FOUT1 nFOUT1 FOUT0 nFOUT0 M Divider M=8 EXT_CLK EN_EXT_CLK STOP FOUT_SEL M906-02 Rev 2.0 M906-02 VCSO Based Clock Generator Revised 26Nov2003 Integrated Circuit Systems, Inc. Communications Modules w w w. i c s t . c o m tel (508) 852-5400 |
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