Lec11ADC

Lec11ADC - Lecture 11. Analog to Digital Converter (ADC or...

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ECE 471 11-ADC-1 Lecture 11. Analog to Digital Converter (ADC or ATD) Introduction to ADC 68HC12 ADC module Configuration registers. Application example
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ECE 471 11-ADC-2 ADC Concepts Resolution Number of different digital levels n bits ADC means the resolution is In terms of 2 n Linearity Is digital value changes linearly with respect to analog value? Accuracy Usually described as the multiple of least resolution bit. (e.g., +- ½ of least significant bit, +- 2 times least significant bit) Speed Number of samples per second
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ECE 471 11-ADC-3 68HC12 ADC The ATD has 8 multiplexed channels, Each channel is 10-bit, multiplexed-input, Use successive-approximation method for conversion. Accurate to +- 2 least significant bit (LSB). It does not require external sample and hold circuits because of the type of charge redistribution technique used. The ATD converter timing is synchronized to the system P clock. The ATD module consists of a 16-word (32-byte) memory-mapped control register block used for control, testing, and configuration.
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ECE 471 11-ADC-4 Conversion Methods The common method for A to D conversion are ramp, successive approximation or dual-slop methods. Only the first two methods will be discussed here. The basic idea behind the two conversion techniques is to 1. Generate a known analog value with a know digital value 2. Compare the known analog value to the input analog signal.
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This note was uploaded on 01/31/2008 for the course ECE 471 taught by Professor Chien during the Spring '08 term at IUPUI.

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Lec11ADC - Lecture 11. Analog to Digital Converter (ADC or...

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