https://osmocom.org/https://osmocom.org/favicon.ico?16647414092019-01-12T21:12:41ZOpen Source Mobile Communicationsosmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=130602019-01-12T21:12:41Zlaforge
<ul></ul><p>See also <a class="wiki-page" href="https://osmocom.org/projects/miscellaneous-projects/wiki/C_Band_LNB_Ext_Ref_Mod">C_Band_LNB_Ext_Ref_Mod</a></p> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=130622019-01-14T13:47:25Zlaforge
<ul></ul>Some related ideas, in random order:
<ul>
<li>use SAMD11 or SAMD21 microcontroller: Small, self-contained, no external clocks, UART+USB+I2C</li>
<li>offer switchable 50 ohms termination on the clock input (jumper?)</li>
<li>clock input on BNC, as is common for 10MHz?</li>
<li>clock outputs on SMA? some on u.fl?</li>
<li>separate/adjustable LDO for [some] clock outputs? They have individual supply pins...</li>
<li>pAC coupling and resistive divider / biasing or even schmitt-trigger to ensure our symmetric clock input can safely feed into the CLKIN pin which is CMOS input...</li>
<li>tvs diodes on all connectors</li>
<li>overvoltage / reverse polarity protection</li>
</ul> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=130692019-01-14T15:30:31Zlaforge
<ul><li><strong>Subject</strong> changed from <i>build SI5351C based clock generator boards</i> to <i>design/build SI5351C based clock generator boards</i></li></ul> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=130802019-01-16T22:02:56Zlaforge
<ul><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' disabled> <i>TVS on all clocks and digital connectors</i> added</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' disabled> <i>define pinout of TC-2030 for SWD</i> added</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' disabled> <i>decide on DC input jack (like mpcie-breakout?)</i> added</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' disabled> <i>ferritte bead between analog(clock) and digital(SAMD) supply?</i> added</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' disabled> <i>overvoltage / reverse prolarity protection</i> added</li><li><strong>Status</strong> changed from <i>New</i> to <i>In Progress</i></li><li><strong>% Done</strong> changed from <i>0</i> to <i>10</i></li></ul><p>Initial incomplete design pushed to <a class="external" href="http://git.osmocom.org/osmo-small-hardware/log/?h=laforge/clock-gen">http://git.osmocom.org/osmo-small-hardware/log/?h=laforge/clock-gen</a></p>
<ul>
<li>has ATSAMD11 in QFN20 package as main processor
<ul>
<li>USB on mini-B jack</li>
<li>UART on 2.5mm osmocom style jack</li>
<li>SWD on TagConnect TC-2030</li>
</ul>
</li>
<li>SN74LVC1G04 based self-biasing clock squarer for input side</li>
</ul> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=131402019-01-25T12:46:17Zlaforge
<ul><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' checked disabled> <i>TVS on all clocks and digital connectors</i> set to Done</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' checked disabled> <i>define pinout of TC-2030 for SWD</i> set to Done</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' checked disabled> <i>decide on DC input jack (like mpcie-breakout?)</i> set to Done</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' checked disabled> <i>overvoltage / reverse prolarity protection</i> set to Done</li><li><strong>% Done</strong> changed from <i>10</i> to <i>80</i></li></ul> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=131482019-01-26T11:34:50Zlaforge
<ul><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' disabled> <i>add i2c/spi on a header (maybe UEXT)</i> added</li></ul> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=131572019-01-26T18:17:30Zlaforge
<ul><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' disabled> <i>add M3 or M2.5 mounting holes (at least three)</i> added</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' checked disabled> <i>add i2c/spi on a header (maybe UEXT)</i> set to Done</li></ul> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=131582019-01-27T17:39:36Zlaforge
<ul><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' checked disabled> <i>ferritte bead between analog(clock) and digital(SAMD) supply?</i> set to Done</li><li><b>Checklist item</b> <input type='checkbox' class='checklist-checkbox' checked disabled> <i>add M3 or M2.5 mounting holes (at least three)</i> set to Done</li><li><strong>File</strong> <a href="/attachments/3530">clock-generator.pdf</a> <a class="icon-only icon-download" title="Download" href="/attachments/download/3530/clock-generator.pdf">clock-generator.pdf</a> added</li><li><strong>File</strong> <a href="/attachments/3531">clock-generator.brd.pdf</a> <a class="icon-only icon-download" title="Download" href="/attachments/download/3531/clock-generator.brd.pdf">clock-generator.brd.pdf</a> added</li><li><strong>File</strong> <a href="/attachments/3532">osmo-clock-gen_eagle.png</a> <a class="icon-only icon-download" title="Download" href="/attachments/download/3532/osmo-clock-gen_eagle.png">osmo-clock-gen_eagle.png</a> added</li><li><strong>% Done</strong> changed from <i>80</i> to <i>90</i></li></ul><p>First version finished: <img src="https://osmocom.org/attachments/download/3532/osmo-clock-gen_eagle.png" alt="" /></p> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=131592019-01-27T17:55:19Zlaforge
<ul><li><strong>Project</strong> changed from <i>Misc Hardware Projects</i> to <i>osmo-clock-gen</i></li></ul> osmo-clock-gen - Feature #3758: design/build SI5351C based clock generator boardshttps://osmocom.org/issues/3758?journal_id=136192019-03-24T10:37:35Zlaforge
<ul><li><strong>Status</strong> changed from <i>In Progress</i> to <i>Resolved</i></li><li><strong>% Done</strong> changed from <i>90</i> to <i>100</i></li></ul><p>board v1 exist and is working according to <a class="user active" href="https://osmocom.org/users/46">horiz0n</a> .</p>