Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
18-120
Freescale Semiconductor
Figure 18-68. Quantization Error Reduction During Calibration
18.5.7
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. This section targets users
familiar with terminology in QADC.
is an overview of a QADC.
Figure 18-69. 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
Содержание MPC5565
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