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ADS5281 A/D Converter Differential signals to Single Ended signals

sahit venkat
Intellectual 260 points
Other Parts Discussed in Thread: ADS5281

I am working on project named 'Data Acquisition System'. here I am using ADS5281 8 channel and 12 bit output , here output of ADS5281 will be differential signal output(Lvds) Is there any way I could configure ADS5281 to produce output in single ended signal.

Reason why i am concerned is while interfacing to fpga i wanted to decrease number of pins that to be connected to fpga if it is single ended signal i can make lot difference in the pin count  i can tie all neutrals to 0 

Thanks in Advance 

Sahitya Venkatayogi

  • 0
    TI__Mastermind 29220 points

    Hi,

    No, the serialized sample output is LVDS, which is differential.  If you consider the max sample rate of the device and that the sample data is serialized onto one data pair, that total bit rate (600 Mbps) is much too fast to use single ended signalling.  You wouldn't be able to close timing into an FPGA at that data rate using single ended signalling.  Also, single ended signalling is noisy in nature in that each signal needs a current return path and with single ended signalling that return path has to be the nearest ground pin, and on occasions when all the outputs are switching the same way the current return path presents problems keeping the noise out of the ADC inputs.  LVDS signalling is constant-current, with current out of one side of the LVDS driver returning into the other side of the LVDS driver - no current return path and simultaneous switching noise issues.

    Regards,

    Richard P.