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ADC10080: Gain Error

Part Number: ADC10080

Hi Team, seeking for some assistance.

We need to know how much gain error we may expect from ADC10080 in our design.

In our design, ADC's input is drived by a ADA4930-1 differential amplifier. ADC's input signals are symetric around an identical VOCM DC voltage.

In ADC10080's datasheet page 6, Gain Error (GE) is specified for Positive Error and Negative Error, with min/max values of -1.6/+2.0 %FS.

We believe "Positive Error" means "for Vin+ input" and "Negative Error" means "for Vin- input", so we get error for individual inputs. Is it right?

If this is right, we need to know the differential gain error (Vin+ - Vin-) for our application. Are Vin+ and Vin- individual gain error quite the same, such that differential gain error tends to be close to 0%FS? Any value to provide about differential gain error?

Else, can Positive Error and Negative Error be opposed for a same part (let say Vin+ at +2.0 %FS while Vin- at -1.6 %FS for example) leading to a worst case total error close to 4% FS?

Thank you in advance.

  • Hi Mark,

    We are looking into this and will get back to you.

    Regards,

    Rob

  • Hi Rob, do we have an update for this?

    Thank you

  • Hi Mark,

    The gain error listed on the data sheet is based on the difference in digital output code measured against the amplitude of the analog input signal as a percentage of the full-scale voltage.

    The positive and negative error ranges listed do not correlate to the differential inputs, but to how much error may manifest on the low and high ends of the full-scale. That is to say, the negative and positive full-scale transitions (VFS+ and VFS-). This is what is meant by positive/negative error.

    The error at each of these transition points may result in an output code that represents a higher or lower voltage than was presented at the front end. This is how you can have a negative percent of a positive gain error, for example.

    Of course not all converters are the same, so you can expect yours to perform somewhere in the range mentioned. 'The typical' value will be very close for most converters.

    Many apologies for the delay, we wanted to make sure we gave you an accurate answer as well as explained the true meaning of these parameters.