SX8725C View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX8725C' PDF : 68 Pages View PDF
SX8725C
ZoomingADC for sensing data acquisition
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Finally, combining Equation 5 to Equation 7 for the three PGA stages, the input voltage VIN,ADC of the ADC is related to
VIN by:
VIN ,ADC = GDTOT ⋅VIN − GDoffTOT ⋅ S ⋅VREF [V ]
Equation 10
where the total PGA gain is defined as:
and the total PGA offset is:
GDTOT = GD3 ⋅ GD2 ⋅ GD1
Equation 11
GDoffTOT = GDoff3 + GD3 ⋅ GDoff2
Equation 12
7.6.1 PGA Ranges
Figure 11 and Figure 12 illustrates the limits for the maximal conversion precision according to the common mode
voltage (VCOMMON), the ADC over-sampling frequency (fs) and PGA gains. The best linearity performances can be
Revision 1.01
© Semtech
January 2011
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