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crystal spec for quickstart — Parallax Forums

crystal spec for quickstart

manitoumanitou Posts: 29
edited 2013-02-26 17:09 in Propeller 1
Does anyone know the part number or specs (ppm) for the crystal on Quickstart board? Bill of materials says 5.000 MHZ 18PF SMD but no part number.

Comments

  • David CarrierDavid Carrier Posts: 294
    edited 2013-02-25 10:08
    We use Abracon part number ABLS-5.000MHZ-B4-T.

    — David Carrier
    Parallax Inc.
  • manitoumanitou Posts: 29
    edited 2013-02-26 17:09
    Thanks. From the datasheet, I interpret the part number to suggest frequency tolerance of 30ppm.

    I tested the crystal frequecy on a couple of Quickstart boards using queries from an NTP-sync'd host a (stratum 0 NTP host, so frequecy is probably accurate to 1ppm) and with the pulse-per-second off of a GPS ( https://www.sparkfun.com/products/465 ). Unsurprisingly, quickstart frequencis were within specs. The simple spin programs can be found at the github site

    https://github.com/manitou48/crystals

    The file crystals.txt has freqeuncy checks on other MCU's, RTCs, TXCOs, RC oscillators. Crystal frequency is affected by heat, voltage, load capacitance, and age, so your measurements may vary.
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