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M685

Integrated Circuit Systems
Part Number M685
Manufacturer Integrated Circuit Systems
Description DUAL SAW / SELECTABLE FREQUENCY VCSO
Published Apr 26, 2005
Detailed Description Integrated Circuit Systems, Inc. Preliminary Information M685 nFOUT DUAL SAW, SELECTABLE FREQUENCY VCSO PIN ASSIGNMEN...
Datasheet PDF File M685 PDF File

M685
M685

Overview
Integrated Circuit Systems, Inc.
Preliminary Information M685 nFOUT DUAL SAW, SELECTABLE FREQUENCY VCSO PIN ASSIGNMENT (5 x 7.
5mm SMT) FOUT VCC 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 175 MHz.
The M685-02 provides 500 to 700 MHz.
Guaranteed minimum pull-range of ±120 ppm meets GbE requirements.
(It also fully satisfies ±50 ppm minimum pull-range specification commonly required.
) Industrystandard 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).
6 5 M685 M680 ( To p Vi ew) 1 2 VIN F_SEL Figure 1: Pin Assignment Sample of Available Output Frequencies VCSO Center Frequencies1 (MHz) 155.
5200, 167.
3316 156.
2500, 161.
1328 622.
0800, 669.
3266 625.
0000, 644.
5313 Applications SONET/SDH, SONET/SDH FEC Gigabit Ethernet, GbE FEC SONET/SDH, SONET/SDH FEC Gigabit Ethernet, GbE FEC FEATURES ◆ Two integrated SAW devices and selectable output frequency; supports multi-rate optical interfaces ◆ M685-01 output frequencies from 125 to 175 MHz M685-02 output frequencies from 500 to 700 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 Table 1: Sample of Available Output Frequencies Note 1: Specify VCSO center frequencies at time of order BLOCK DIAGRAM M680 M685 SAW Delay Line VCSO Phase Shifter VIN SAW Delay Line VCSO Phase Sh...


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