Maxim Integrated 71M6541 Demo Board - Manual (Page 49)

71M6541 Demo Board REV 3.0 User’s Manual
49 Rev 4.0
Figure 2-10: GAIN_ADJ over Temperature
Some curve-fitting is required to find PPMC
6X
and PPMC2
6X
coefficients that will generate the desired behavior
of the GAIN_ADJ register. For this case, PPMC
6X
= -960 and PPMC2
6X
= -610 approach the curve very accu-
rately. The maximum deviation between GAIN_ADJ and the GAIN_ADJ’ synthesized by PPMC and PPMC2
coefficients is 0.00435%. Figure 2-11 shows how both functions almost overlap.
Figure 2-11: GAIN_ADJ and GAIN_ADJ’ over Temperature
16310
16320
16330
16340
16350
16360
16370
16380
16390
16400
16410
-40 -20 0 20 40 60 80
GAIN_ADJ
GAIN_A…
16310
16320
16330
16340
16350
16360
16370
16380
16390
16400
16410
-40 -20 0 20 40 60 80
GAIN_ADJ
GAIN_ADJ'