Q7. On the AD4116 what’s the equivalent TUE (total uncompensated error) spec across different input voltage ranges for example ±10V, ±5V, ±2.5V or 0-10V, 0-5V, 0-2.5V?

The AD4116 is specified for a TUE spec at ±10V full scale range. When input span is reduced the error will change as TUE is specified as a percentage of Full-scale range (%FSR).

To calculate the equivalent TUE spec for smaller ranges, we would take the assumption that gain-error and offset error both account for 50% of the total TUE. Please take note that this method provides only an estimated value, the actual performance could be better or worse as we only guaranteed the TUE spec at ±10V input range.

We can start by working through the errors in mV or V initially and then translating to a final TUE Specification

If we take an input span of ±10V and take the TUE from the datasheet specification for ±10V input at 25°C,192.5 µs settling.

For AD4116, TUE specs at 25°C,192.5 µs settling is specified as 0.1%. Thus,

Offset error = 0.05% of 20V span =>10mV

Full-Scale error at +10V (after correcting for offset error) = 0.05% of 20V span =>10mV

TUE = (10mV+10mV)/20 *100 = 0.1%

Table 2 shows the TUE estimation at 25°C across different ranges. The same approach can be applied when calculating TUE across different temperature.

Table 2. AD4116 TUE estimation at 25°C