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TMS320F28376S: Switching from 12b Singled Ended to 16b Differential ADC

Ryan.Bishop
Expert 3900 points
Part Number: TMS320F28376S

Hi,

One of my customers has a question regarding the TMS320F28376SPTPT DSP and I was hoping you could help me track down an answer.

They originally were using the 12-bit  ADC with single ended configuration, but now require more resolution so they will need to transition over to the 16-bit ADC with differential configuration. I believe this requires a strange pseudo-differential ADC input voltage that is centered around 1.5V.

Do you have an app note or circuit example for something that generates the required levels to feed into the 16bit ADC configuration for the DSP?  They are interfacing with both true differential and single ended analog voltages that we will need to feed into the DSP.

Thank you!

Ryan

  • 0
    Guru 192875 points

    Hi Ryan,

    Ryan.Bishop said:
    Do you have an app note or circuit example for something that generates the required levels to feed into the 16bit ADC configuration for the DSP?

    I'm afraid that there's any App note for differential sensing. Though you can refer these threads:

    As for application examples, you can simply google 'Convert Single-ended to Differential ADC sensing'  and understand the requirement.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    TI__Guru 60865 points

    Hi Ryan,

    The F2837x ADC is fully differential in 16-bit mode.  The common mode voltage must be within +/-50mV from VREFHI/2. 

    Please review the information linked by Gautam.  If you need further assistance, then you may want to post over in the Precision analog forum: 

    e2e.ti.com/.../

    They should be able to suggest parts and topology for driving a fully-differential ADC.