ADS1018-Q1: ADS1018-Q1 Total Gain Error

Koh-san,


The gain error for the ±6.144V range isn't specifically listed in the datasheet, but it can be inferred from other listed specifications.

Start with the maximum gain error for the ±2.048V range as ±0.25% at Ta=25°C. The maximum gain drift is 40ppm/°C. From 25°C to 105°C, there is an 80°C change and that could cause a gain error drift of 0.32%. Finally, the gain match between any two gains is 0.1%. Adding the three specifications, the maximum total gain error would be:

Max gain error = 0.25% + 0.32% + 0.1% = 0.67%


Joseph Wu

Koh-san,

The gain match is added because the min/max gain error specification is given only for the ±2.048V range. The 0.1% additional gain error comes from using the device in a different input range (in this case the ±6.144V range).

However, the gain channel match is not added because the original specification for gain error should incorporate gain error for all channels.

In the datasheet, both are listed in the electrical characterisitics table:

Joseph Wu