eRTM15 Schematics & Layout Review
Greg's notes:
- Clk_generation.SchDoc:
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You have to supply +5V reference voltage to the OCXO, right? R111 is declared unmounted, so will not apply ref voltage to it. the LTC2641 does not have internal Vref. Resolution: Not for the Morion VCXO that we’re going to use – it has its’ internal ref generator that feeds the DAC.
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In addition, you have selected +3V reference voltage (DAC will gives 0->+3V output), the OCXO tune range is 0->+5V. So you do not cover the whole tune range
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You did not place a capacitor on the TRIM/NR pin of the REF5030
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From my arithmetic, the reference voltage only will give you a frequency vs temperature of 310^-12/°C. Where as the OCXO itself is specified 710^-12/°C (+20 to +40°C). I guess is fine? maybe high grade for the REF5030AID?
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