Sfp-experimenter » History » Version 3
laforge, 10/07/2018 06:55 AM
| 1 | 1 | laforge | h1. sfp-experimenter |
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| 3 | This is the twin brother of the [[sfp-breakout]] board. It contains LVDS receiver/transmitter circuits, so you can use single-ended signals on the electrical side. |
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| 5 | h2. Schematics / Design files |
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| 7 | The schematics / design files are kept in git at https://git.osmocom.org/osmo-small-hardware/tree/sfp-breakout |
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| 9 | 3 | laforge | You can see the design discussion in #3314 and notes from board-bringup at #3523 |
| 10 | 2 | laforge | |
| 11 | 1 | laforge | h2. Photos |
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| 13 | !sfp-experimenter.jpg! |
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| 15 | h2. Availability |
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| 17 | h2. Errata |
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| 19 | h3. sfp-experimenter v1 |
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| 21 | h4. R6 pull-down re-work |
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| 23 | there was a need to place a bias resistor from RD_N to ground (pin4 on ic2) or the whole board would not work. ic2 has internal 100ohm prom pin3 to pin4 and pullups of ~300k to vcc. 100k pulldown on one leg pushes it into the proper operating range. due to the 100ohm its not neccessary to have more than one pulldown. |
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| 25 | !sfp-experimenter-r6-rework.jpg! |
