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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->

Typical A/D Board Architecture


A typical A/D (analog to digital converter) board contains the following major subsections:
  • Input multiplexors - enable multiple input channels to share a single A/D circuit
  • Gain circuit - enables you to select different amplification levels based on the input signal range
  • A/D converter - converts the analog input to a digital value
  • FIFO - stores A/D data on board until the processor is ready to read it out
  • Counter/timer - for counting applications and for A/D sample rate control
  • Control logic - controls all the timing of the various circuits on the board
  • Bus interface - transfers commands and data between the board and the CPU
  • D/A converter (optional) - provides analog output functions
  • Digital I/O (optional) - provides digital input and output functions
  • Power supply - provides clean power for the analog circuitry, typically +/-15V