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AD9139, saveral questions

Question asked by usaghi on Feb 13, 2014
Latest reply on Feb 13, 2014 by jerryguo



We can see temperature drift data on AD9139 datasheet Rev.0, as Gain Drift = 100ppm/degC, and Reference Voltage Drift = 30 ppm/degC. When we use external reference, does it mean total voltage gain drift must becomes to 100+30=130 ppm/degC, doesn't it ?


When ADI use word "temperature drift" as decribed in ppm, it doesn't matter to its direction( plus or minus ), so 100 ppm/degC and 30 ppm/degC can be -100 or -30, thus gain drift when using external reference can be from +130ppm/degC to -130ppm/degC, we're assuming, but is it correct ?

Or accumulated gain drift 130 ppm/degC is full range so, it can be from -65ppm/degC to 65 ppm/degC as center on drift=0, isn't it ?


Sorry to ask these basics, but your confirmations are very much appreciated.


Best Regards,