PXR40RM Datasheet, PDF (1110/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Enhanced Queued Analog-to-Digital Converter (EQADC)
Digital
Value
(14-bit result)
Shifted
Transfer Curve
Ideal Transfer Curve
4
ADC Transfer Curve
0
Quantization
Error
2
0
-2
Input
Voltage
(12-bit AD resolution)
Error for Shifted
Transfer Curve
Input
Voltage
(12-bit AD resolution)
-4
Error for ADC Transfer Curve
Figure 27-77. Quantization error reduction during calibration
27.8.7 EQADC Versus QADC
This section describes how the EQADC upgrades the QADC functionality. The section also provides a
comparison between the EQADC and QADC in terms of their functionality. This section targets the users
familiar with terminology in QADC. Figure 27-78 is an overview of a QADC. Figure 27-79 is an overview
of the EQADC system.
27-128
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor