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A/D Board Tutorial
Slideshow Contents
Introduction
Typical A/D Board Architecture
A/D Chip Technology
Resolution and Input Range
Input Bandwidth
Input Channel Configurations
Differential Input Simulation
A/D Sampling Methods
A/D Triggers
Sampling Sequences
Data Transfer to Memory
Interrupt Timing
Source Impedance
Source Impedance - Solution
Calibration
Autocalibration
Comparison Test: Autocalibration vs. Manual Calibration
Results: Autocalibration vs. Manual Calibration
<-prev next->

A/D Sampling Methods
There are three "layers" involved in A/D sampling:
  • Trigger or Clock - This is the way in which A/D conversions are initiated.
  • Sampling sequence - This determines the timing of the samples when handling multiple channels at the same time.
  • Data transfer to memory - This determines how the A/D data values are transferred from the board to the processor's memory for use by the application.

It is important to note that not all boards offer the same set of options for each layer. Different vendors provide different capabilities on their boards. More advanced boards have more options for greater flexibility in meeting the needs of your application.

Each of these options will be discussed in the proceeding slides.