ZHCSQG1H November 2009 – May 2022 LMP8645 , LMP8645HV
PRODUCTION DATA
The maximum voltage at the RG pin is Vout_max, it means that:
where
So all the RGAIN resistors which respect the previous inequality are allowed. The graphical representation in Figure 7-5 helps with the selection.
All the combinations (VSENSE, RGAIN) below the curves are allowed.
Figure 7-5 Allowed Gains for Range 3Also in this range once selected the RGAIN (Gain) the VSENSE range is fixed too.
From the ranges shown above, a good way to maximize the output voltage swing of the LMP8645 is to select the maximum allowable RGAIN according to the previous equations. For a fixed supply voltage and VSENSE as the common-mode voltage increases, the maximum allowable RGAIN increases too.