Other Parts Discussed in Thread: ADS4246, , THS4531, THS4551
I'm trying to use a ths4541 to drive an ads4246 ADC and am having a problem with the dc levels of the outputs.
The ADC expects inputs balanced about 950mV and outputs a 950mV reference level. I feed this signal into the Vcm input of the ths4541 but the outputs are not centred on 950mV.
It appears that the average of the two outputs is 950mV, but the individual outputs are not centred on 950mV.
This causes the ads4246 to report a DC offset on its inputs, and I cannot use the full dynamic range of the part as I have seen the offset up to 200mV.
The precise levels varies with my test conditions, but to give an example, the dc input levels of the THS4541 were 2.537V, 2.476V, and the corresponding dc levels on the outputs were 1071mV, 847mV (Vocm was 962mV in this test).
Thanks for any help, John