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I suggest to read the ADC datasheet regarding suggested options for DC input signals. I mentioned a true differential driver, which is the best option in terms of supressing common mode interferences and also achieves best ADC linearity.
A single ended configuration would e.g. remove R1, C1 and T2, connect left side of R5 to VNCT_A and left side of R4 to input jack. The input voltage range is 0.5 to 2.5 then.
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Thanks for the info. I tried to implement this single ended configuration but was unsure of a few aspects. I removed R1 C1 and T2 and connected R4 to the input jack so that now the SMA input is connected the VINpA pin of the AD9248 by only the 33ohm resistor R4. I assume this to be correct
The problem is where to connect R5 to VINCT. To the pad of the removed transformer T2 or directly to the bridge between R2 and R3?? Also, by left side I assume you mean left side on the schematic, i.e input jack side as opposed to ADC side.
I hope I can get this working as the DAC side works perfectly. Unfortunately there is very little useful info on the AD9248 or terasic board data sheets about configuring for single ended ADC operation
Thanks
Ben.
Honored Contributor
