MC9328MX1/D ETC, MC9328MX1/D Datasheet - Page 57

• Manufacturer Part Number: MC9328MX1/D
• Description: i.MX Integrated Portable System Processor
• Manufacturer: ETC

3.11.3 Offset Calculations
The ideal mapping of input voltage to output digital sample is defined as:
In general, the mapping function is:
Where V is input, S is output, G is the slope, and C is the y-intercept.
Nominal Gain G
Nominal Offset C
3.11.4 Gain Error Calculations
Gain error calculations are made using the information in this section.
Assuming the offset remains unchanged, the mapping is rotated around y-intercept to determine the maximum gain
allowed. This occurs when the sample at 1800mV has just reached the ceiling of the 16-bit range, 65535.
Freescale Semiconductor
S = G * V + C
0
0
= 65535 / 4800 = 13.65mV
= 65535 / 2 = 32767
-2400
- 2400
MC9328MX1 Advance Information, Rev. 4
Figure 37. Gain Error Calculations
Figure 36. Offset Calculations
65535
Smax
-1
65535
Smax
Sample
Sample
C0
C0
1800
1800
Gmax
2400
2400
G0
G0
Vi
Vi
Specifications
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