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m2020 - Block Diagram
m2020 - Pinout


VCSO Based Clock PLL

The M2020/21 is a VCSO (Voltage Controlled SAW Oscillator) based clock jitter attenuator PLL designed for clock jitter attenuation and frequency translation. The device is ideal for generating the transmit reference clock for optical network systems supporting 2.5-10 GB data rates. It can serve to jitter attenuate a stratum reference clock or a recovered clock in loop timing mode. The M2020/21 module includes a proprietary SAW (surface acoustic wave) delay line as part of the VCSO. This results in a high frequency, high-Q, low phase noise oscillator that assures low intrinsic output jitter.


  • Integrated SAW (surface acoustic wave) delay line
  • Low phase jitter of < 0.5ps rms, typical (12kHz to 20MHz or 50kHz to 80MHz)
  • Output frequencies of 15 to 700 MHz *
  • LVPECL clock output (CML and LVDS options available)
  • Reference clock inputs support differential LVDS, LVPECL, as well as single-ended LVCMOSLVTTL
  • Loss of Lock (LOL) output pin
  • Narrow Bandwidth control input (NBW pin)
  • Hitless Switching (HS) options with or without Phase Build-out (PBO) available for SONET (GR-253) / SDH (G.813) MTIE and TDEV compliance during reference clock reselection
  • Industrial temperature grade available
  • Single 3.3V power supply
  • Small 9 x 9 mm SMT (surface mount) package

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeCore Voltage (V)Phase Jitter Typ RMS (ps)
2LVPECL19.440000, 19.531250, 20.916456, 77.760000, 78.125000, 83.665825, 155.520000, 156.250000, 167.331650, 622.080000, 625.000000, 669.32660010.000000 - 700.0000002LVDS, LVCMOS, LVPECL3.30.250

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
M2020-11-622.0800ObsoleteCG36CLCC36CYesTubeCheck Availability
M2020-11-622.0800TObsoleteCG36CLCC36CYesReelCheck Availability
M2020-11-625.0000ObsoleteCG36CLCC36CYesTubeCheck Availability
M2020-11-625.0000TObsoleteCG36CLCC36CYesReelCheck Availability
M2020-11-669.3266ObsoleteCG36CLCC36CYesTubeCheck Availability
M2020-11-669.3266TObsoleteCG36CLCC36CYesReelCheck Availability
M2020-13-622.0800ObsoleteCG36CLCC36CYesTubeCheck Availability
M2020-13-622.0800TObsoleteCG36CLCC36CYesReelCheck Availability
M2020-13I622.0800ObsoleteCG36CLCC36IYesTubeCheck Availability
M2020-13I622.0800TObsoleteCG36CLCC36IYesReelCheck 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