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TM4C1294NCPDT: Effective Number of bits for ADC in the MCU - TM4C1294NCPDTT3

Arunasri K
Prodigy 90 points
Part Number: TM4C1294NCPDT

Tool/software:

Hi Team,

Can you please let us know the effective number of bits (ENOB) of ADC in TM4C1294NCPDTT3 (MCU part) ? 

Waiting for your valuable feedback

Thanks & Regards,

Arunasri K

Sanmina

  • 0
    TI__Guru**** 191486 points

    Hi,

    The ENOB is affected by the Signal-to-Noise + Distortion Ratio. 

    There is a relationship between ENOB and input signal bandwidth.  As the bandwidth of the input signal increases, SNR will start to decrease at some point due to aperture jitter in the ADC S+H.  You can see that we specify SNR at 1kHz for this device; if the input signal is faster than this SNR will start to degrade.

     Also refer to the ADC section of the TM4C129 system design guideline for best practices on PCB design concerning ADC. https://www.ti.com/lit/pdf/spma056

     Oversampling will also help to increase EONB. The goal of oversampling is to increase ENOB by reducing the noise observed in the signal. Oversampling performs multiple conversions on the same input signal and accumulates the digital values to attain an ENOB higher than the inherent ENOB of the ADC.