Other Parts Discussed in Thread: ADS1115
The ADS1115 is an interesting part with a large PGA range and the internal reference. I am having difficulty understanding the overall accuracy of the part. I can not find an accuracy specification for the internal reference. There are lots of LSB and PPM/°C numbers for the various INL, gain and offset parameters. Trying to sum these numbers up, I get something like 0.5% over 100C temperature range. There is also a graph (Figure 19 on page 8) that provides a total error vs. input signal. This looks like a maximum of 0.14%, but apparently doesn't include temperature variation. Is the reference voltage offset and drift included in this graph and the table of INL, gain and offset error rates? If anyone knows of an application note that would point me in the right direction, I would appreciate it.
