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ADS8556: ADC CONVERSION DETAILS

Siddharth Sangam
Intellectual 640 points
Part Number: ADS8556

Hi,

I am using ADS8556IPMR ADC IC in my design with following considerations. Vref as 2.5V.

HVDD = +15V and HVSS = -15V.

I am providing input voltage range from -10V to +10V to CH_A0. Need to to know how to calculate the ADC counts using formula.

Please provide us the equation to be consider to calculate ADcount.

If possible please provide examples to find ADcount with and without error considerations.

with regards

Siddharth Sangam 

  • 0
    TI__Mastermind 25020 points

    Hello,

    The ADS8556 is a 16 bit device, meaning the output data will be formatted as 16 bits. It also uses 2’s compliment, which means the leading bit, the MSB will indicate the polarity of the measurement. Be sure to program your host to read the ADC output data as signed value, this will take into consideration the 2's compliment.

    To evaluate the ADC output, you will need to know the full scale range and output measurements.

     FSR = +10V to 10C = 20V

    Resolution = 16 => 2^16 = 65535

    Equation:

    (ADC_Measuremet * FSR) / 65535

     Regards

    Cynthia

  • 0 in reply to Cynthia
    Intellectual 640 points

    Thankyou Cynthia.

    with regards,

    Siddharth Sangam.