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| HP5385A OCXO Timebase |
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| Miti:
--- Quote from: wkb on November 07, 2021, 11:07:57 am ---From that datasheet I conclude that the 4.095V reference is what is needed for Miti's PCB? --- End quote --- I can’t see how you concluded that based on the data sheet, but I may have missed something. The idea is to have the tightest possible adjustment range around the VC that would give you a 10MHz output. You can’t know what that VC value is until you measure it. So power on your OCXO, let it stabilize for couple of weeks, then measure its frequency with your frequency counter using GPSDO as reference. Adjust the VC until you get 10MHz. See what that VC is and calculate the components to generate that voltage +/- few tens to a hundred mV so you can have fine adjustment, and that should be around 2V. |
| wkb:
Well, the adjustment voltage range the datasheet gives brings me to that conclusion. In industrial production they cannot run the OCXO for a couple of weeks to see what voltage reference might match best. So I assume they go for a ref that allows full range adjustments. One could use a coarse/fine pair of adjustments if need be? Wilko |
| PerArdua:
Thank you for sharing your design Miti. Would you be able to confirm the dimensions between pins of the OSC5A2B02 please? I've not been able to find a datasheet with this information online. |
| Miti:
--- Quote from: PerArdua on September 08, 2022, 08:17:12 pm ---Thank you for sharing your design Miti. Would you be able to confirm the dimensions between pins of the OSC5A2B02 please? I've not been able to find a datasheet with this information online. --- End quote --- You can measure it in the Gerbers, my measurement shows 19.05mm between corner pins and pin 2 equal distance to 1 and 3. I can't remember if I found the datasheet or I measured but I created the Eagle library. It seems to fit well. |
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