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

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
ECE 471 11-ADC-1 Lecture 11. Analog to Digital Converter (ADC or ATD) Introduction to ADC 68HC12 ADC module Configuration registers. Application example
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 2
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.
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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.
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern