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Measuring the ADL5565 (ADC Driver)

Question asked by TNR on Aug 5, 2014
Latest reply on Aug 6, 2014 by TNR



I am using the ADL5565 as an ADC Driver and I characterizing it before implementation. I have a few questions however.


I am using the EVAL board and I see there is an 11dB insertion loss associated with the network matching 200 ohms to 50 ohms. The data sheet however also says there is a 17dB insertion loss on page 24 in the description area. Is the 17dB with reference to a 10ohm source? I see that there is a voltage gain of 15.5dB when you measure after the voltage divider network however I am uncertain how to get power gain. I calculate a power gain of about 22dB which seems incorrect.


Also, I would like to characterize this device down to DC however it is AC coupled. I would like to know the limitations of DC coupling and whether it is necessary to use the bypass cap C12.


Thank you for the help.