1. Can passive or active crystal oscillators be used instead of U60?
2. Is the PIN10 VC of U60 a controlled foot?
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1. Can passive or active crystal oscillators be used instead of U60?
2. Is the PIN10 VC of U60 a controlled foot?
Hello Jeffrey,
1. SEC_REF input can accept a passive crystal, and both signals can accept an active oscillator. A TCVCXO or a VCXO is not required.
2. In this schematic, U60 appears to be controlled by some DAC for frequency adjustment capability. Again, a TCVCXO or VCXO is not required to be used for the reference input, it is just useful to have an adjustment voltage to trim frequency error.
Regards,