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ADS1120: ADS1120

Pradeep NG
Prodigy 50 points
Part Number: ADS1120

Hi,

I am using ADS1120IPWR part in one of my design. I have configured ADC to measure single - ended inputs (0-5V). 

I am providing AVDD - 5V and AVSS- Analog ground. As i am using the device in single-ended mode, can i get a full 16 bit range for the 0-5V input? I mean, for input of 0V - ~0000 and for 5V - FFFF? Please confirm. 

I am attaching the snippet of the ADC connection i have done on the board below. AN0-AN3 are the analog single ended inputs varying between 0-5V. 

  • 0
    TI__Expert 7580 points

    Hi Pradeep,

    The binary output codes for the ADS1120 are represented in two's compliment form:

    This means that the output code FFFF would correspond to a differential volage of -5V with the absolute voltage at AINN being higher than the voltage at AINP.

    For single-ended inputs, a FSR input of 5V would map to the output code 7FFF instead.

    Since your inputs will be single-ended only the positive half of the Full Scale Range will be available.

    Hope this helps clarify and let me know if there are further questions.

    Best Regards,

    Angel