I'm using a FMC board card with ADC - LTC2174. After power on，I can detect DCO signal of the ADC with Oscilloscope. However I can't detect FR signal.
1. I think that FR signal will be automatic generated after power on (just like DCO signal). Is that actually true?
2. I don't connect analog inputs of ADC. Must analog inputs be connected in order to generate FR signal?
The Frame clock is generated along with the DCO, if the ADC is powered and given an encode clock then both frame and DCO will come out along with data. No input signal is needed.