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TMS320F28379D: 16Bit Differential ADC used as single ended or Pseudo-Differential.

Matt Corley
Prodigy 55 points
Part Number: TMS320F28379D

Besides the loss of 1/2 the input range, what kind of errors/ problems can occur when using the 16Bit ADC in either a single ended (ADCN connected to gnd) or Pseudo-Differential mode (ADCN connected to Vref/2).  Neither mode meets the input common mode voltage requirement.

  • 0
    TI__Mastermind 30185 points

    Hello Matt,

    When using the F2837xD 16-bit differential mode, the converted value is taken as the difference between the ADCINxP and ADCINxN. For both the cases you mentioned, you can imagine if the below chart had a fixed ADCINxN and then subtract it from the ADCINxP value:

    (Taken from Figure 8-31 in the F2837xD datasheet)

    The amount of error is not really predictable, since it will depend on the position of the ADCINxP voltage (i.e. the error will be greater in relation to the two voltages not being symmetrical).

    Best regards,

    Omer Amir