Hello,
Continuation of the AD8429 and gain error vs temperature thread. Hello, I was about to ask the same question and found the thread. However, it does not fully answer the original question and mine.
The AD8421BRMZ specifies for G=1 a Gain vs Temp of 1 ppm/°C. However, Figure 27 shows two tested samples, one clearly having a negative slope. So is the specification +/- 1 ppm/°C.
Then does the same remark apply to G>10 case ? Because +50 or -50 counts a lot in my case, the negative sign compensating fro other positive gain drifts in the acqusition chain.
Then finally, the un-answered point: is there a typical value ? or said in an other way, what would be a likely range of variation on that specification ? If the actual value is indeed +/-50ppm, then I have my answer. Otherwise, I cannot just plug -50ppm/°C in the calculation and having a quasi-perfect, no temperature drift acquisiton chain. That would be to good to be true.
Thanks
Best regards
Pascal
