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M685 - Block Diagram
M685 - Pinout


Dual Saw, Selectable Frequency VCSO

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.) 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).


  • 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

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Supply Voltage (V)Phase Jitter Typ RMS (ps)Freq. Stability Total (± PPM)
1LVPECL622.080000, 625.000000, 644.530000, 644.531300, 657.421900, 666.514300, 669.326600, 672.162700, 693.483000, 696.614900, 707.3527003.300.160100

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
M685-02-AA-ABObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AA-ABTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AA-ADObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AA-ADTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AA-AEObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AA-AETObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AA-AHObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AA-AHTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AA-AJObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AA-AJTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AB-ADObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AB-ADTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AD-AAObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AD-AATObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AD-ALObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AD-ALTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AD-AMObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AD-AMTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AE-AHObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AE-AHTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AH-AAObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AH-AATObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AH-ALObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AH-ALTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AJ-AUObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AJ-AUTObsoleteCB6CLCC6IYesReelCheck Availability
M685-02-AM-AQObsoleteCB6CLCC6IYesTubeCheck Availability
M685-02-AM-AQTObsoleteCB6CLCC6IYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
PDN# : Z-13-01 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 71 KB Mar 19, 2013