Overview

The M908-02 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. From the M908-02-155.5200, an output clock frequency of 155.52MHz is provided from eight LVPECL clock output pairs. (Other frequencies are available; consult factory.) The accuracy of the output frequency is assured by the internal PLL that phase-locks the internal VCSO to the reference input frequency (19.44MHz for the M908-02-155.5200). The input reference can either be an external crystal, utilizing the internal crystal oscillator, or a stable external clock source such as a packaged crystal oscillator.
m908-02 - Block Diagram
m908-02 - Pinout
m908-02 - Block Diagram
m908-02 - Pinout
  • Output clock frequency range 75MHz to 175MHz (Consult factory for frequency availability)
  • Eight identical LVPECL output pairs
  • Jitter 0.7ps rms (at 155.52MHz, over 12kHz-20MHz), typ.
  • Ideal for OC-48/STM-16 clock reference
  • Output-to-output skew 100ps
  • External XTAL or LVCMOS reference input
  • Integrated SAW (surface acoustic wave) delay line
  • Single 3.3V power supply
  • Small 9 x 9 mm SMT (surface mount) package

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    M908-02-155.5200
    circleObsolete
    memory
    view_in_ar
    		CLCC 36 C Yes Tube
    M908-02-155.5200T
    circleObsolete
    memory
    view_in_ar
    		CLCC 36 C Yes Reel
    Parametric Table tips

    Tips for Using This Parametric Table:

    • Hide Filters button in header: Collapse or expands filters
    • Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
    • Reset button in header: Reset all filters to the page default
    • Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
    • Export button in header: Export the filtered results of the table to an Excel document
    • Filter parts search bar in header: Type to filter table results by part number
    • Hide column button in column headers: Select to hide columns in table
    • AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
    • Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
    • Document icon next to product name in row: View the featured document for this product
    • Chip icon next to the right of the document icon in row: View the block diagram for this product
    • Cart icon to the right of the chip icon: Indicates that samples are available for this product