Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 19-119
Figure 19-68. Quantization Error Reduction During Calibration
19.5.7 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. You must be familiar with
QADC terminology to fully comprehend the following sections.
Figure 19-69 is an overview of a QADC.
Figure 19-69. QADC Overview
4
Ideal Transfer Curve
0
Shifted Transfer Curve
ADC Transfer Curve
Input Voltage
(12-bit A/D Resolution)
Digital Value
(14-bit Result)
1/2
lsb
lsb
0
–4
Error for Shifted Transfer Curve
Input Voltage
(12-bit A/D Resolution)
Quantization Error
1/2
lsb lsb
Error for ADC Transfer Curve
2
–2
Digital control
logic for analog
device
Command queues
External
triggers
Trigger &
queue control
logic
Result queues
Analog-to-digital converter
Interrupt request
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