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M685-01-BA-BH Datasheet(PDF) 1 Page - Integrated Device Technology |
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M685-01-BA-BH Datasheet(HTML) 1 Page - Integrated Device Technology |
1 / 7 page M685 Datasheet Rev 0.7 Revised 29Jul2009 Inte grated De vic e Te chn olog y, Inc. ● Com m u nica t ion M odu les ● www.id t.c om ● te l (508) 8 52-54 00 M685 DUAL SAW, SELECTABLE FREQUENCY VCSO Prelim ina r y Inf o r m ation GENERAL DESCRIPTION The M685 is a dual SAW, selectable frequency VCSO frequency source for low-jitter clock generation. An integrated SAW (surface acoustic wave) delay line implements the high-Q VCO (voltage controlled oscillator) function, which results in low output phase noise and very low jitter. The M685-01 is available in a range of center frequencies from 125 to 177 MHz. The M685-02 provides 500 to 708 MHz. Guaranteed minimum pull-range of ±120 ppm meets GbE requirements. (It also fully satisfies ±50 ppm minimum pull-range specification commonly required.) Industry- standard Kvco (VCO Gain) provides full replacement compatibility. The M685 is well suited for phase-locked loop implementations, clock and data recovery circuits, and other timing applications in telecom and optical fiber networking systems (e.g., OC-48). FEATURES ◆ Two integrated SAW devices and selectable output frequency; supports multi-rate optical interfaces ◆ M685-01 output frequencies from 125 to 177 MHz M685-02 output frequencies from 500 to 708 MHz (Specify center frequencies at time of order) ◆ Industry-standard Kvco for full compatibility ◆ Low phase jitter 0.2ps rms typical for the M685-02 (50kHz to 80MHz) ◆ Differential 3.3V LVPECL output ◆ Single 3.3V power supply ◆ Small 5 x 7.5mm SMT (surface mount) package ◆ Pb-free / Compliant to EC RoHS Directive PIN ASSIGNMENT (5 x 7.5mm SMT) Figure 1: Pin Assignment BLOCK DIAGRAM Figure 2: Block Diagram Sample of Available Output Frequencies VCSO Center Frequencies1 (MHz) Note 1: Specify VCSO center frequencies at time of order Applications 155.5200, 167.3316 SONET/SDH, SONET/SDH FEC 156.2500, 161.1328 Gigabit Ethernet, GbE FEC 622.0800, 669.3266 SONET/SDH, SONET/SDH FEC 625.0000, 644.5313 Gigabit Ethernet, GbE FEC Table 1: Sample of Available Output Frequencies M680 (Top View) M685 F_SEL VIN nFOUT SAW Delay Line Phase Shifter M685 VCSO FOUT SAW Delay Line Phase Shifter VCSO M685 Dual SAW, Selectable Frequency VCSO |
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