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Sampling single ended signal with differential mode in F28377S?

Hac Le
Intellectual 670 points

Is it beneficial to use the differential mode of F28377S ADC to sample a single ended signal? My single ended signal voltage level is about 2.5V, is it fit into the dynamic range of the ADC in differential mode? 

  • 0
    TI__Guru 60865 points
    Hi Hac Le,

    It is worth noting that 12-bit mode only supports single-ended operation and 16-bit mode only supports differential operation. There will certainly be resolution and noise rejection benefits to sampling your signal in 16-bit differential mode vs. 12-bit single-ended. The disadvantages would be that you need more complicated signal conditioning circuitry (if the signal is natively single-ended), you need to use 2 ADC pins for differential mode, and 16-bit sampling takes more time than 12-bit sampling.

    To get your signal into differential format, the easiest way would be to use a circuit with a fully-differential op-amp, although it is also possible to build a circuit using 2 single-ended op-amps to do the conversion.

    www.ti.com/.../fully-differential-amplifier-products.page