Analog-Digital Conversion

This week: This week we will begin to cover sources of conversion errors, and begin to discuss signal conditioning and amplifiers. There are some sample problems -- you can try to solve them and if you have questions, we will go over solutions to the problems in class over the next two weeks. These will be very similar to the problems I will put on the final exam, and the analysis I expect in your project reports.

This week we will cover the conversion error material (adc03a.pdf), and we will begin working on some background material on op amps in the slides (adc04.pdf) below. The revised adc03.pdf file is also available, along with the lecture slides for this week in the ftp directory:

ftp://ftp.hte.com/uconline/adc/ the file names are adc03a.pdf and adc04.pdf

You will probably want to print a copy of the slides and bring them with you to class.

REMEMBER: Your project DRAFT should be turned in ASAP even if on "Not For Grade" basis, and reviewed for potential problems. It must include all proposal information (description, block diagram, time estimate), updated as needed PLUS the detailed preliminary design information including specification sheets for ALL manufacturer's part numbers for your project, with preliminary resolution, range, and accuracy specs.

If you are having serious problems, let me know as soon as possible. The sooner you ask for help the better, as I will become saturated with questions very quickly, so procrastinate at your own risk. If you run into a problem you can't solve, don't spin your wheels, ASK FOR HELP! SEND ME THE DETAILED CIRCUIT SCHEMATICS, and I'll get to it as soon as I can, but don't wait for my reply! Find a suitable work-around and keep going on the rest of your project if at all possible. If you need help figuring out how to work-around your problem, call me and I'll give you some ideas. Your project is due at the last class meeting. Remember -- It's much better to have an inadequate design with a complete report than a working design with a late or inadequate report!

ftp://ftp.hte.com/uconline/adc/library

The files to print and read are: opamp.pdf ccianalg.pdf

Sample test problem: Please print out the following specs, and apply them to the sample analysis that's in the file "Example1.pdf" and substitute the specs from the parts below. Use the worst case values for each part's specified parameters.

Try to answer as many of the questions as you can and bring your answers with you -- we will go over the answers in class -- if you bring two copies, you can turn in one copy at the end of class and I can review/grade and return the other copy for your reference.

The specs are all in the directory: ftp://ftp.hte.com/uconline/adc/specs

For the opamp use the 741C version in: lm741.pdf

For the Sample and Hold, use the LF398 with a 0.001 uF hold cap: lf198.pdf

For the A/D, see the: ltc1406iadc.pdf

For the A/D's voltage reference, use the 2.5 volt LM336-2.5: lm336.pdf

If you're not sure which part of the spec to use, just pick one and go with it!

There are some other specs you should also take a brief look at. Please bring these with you to class, as we will discuss them as well along with the ones above.

Op amps: lt1001.pdf 1097fa.pdf lt1077.pdf lt0005.pdf lt1190.pdf

Instrumentation amplifiers: ad624.pdf ina110.pdf

A/D Converters: adc0801.pdf serial I/O 8 bit, adc08031.pdf serial I/O 8 bit switched cap with mux 8 pin package, lt1286adc.pdf 12 bit switched cap successive approximation 8 pin package, adc0820.pdf half-flash, ad9070.pdf 10 bit flash, ad9054.pdf 8 bit flash, max1125.pdf 8 bit VERY fast 300 MSPS Flash A/D, lt1604iadc.pdf 16 bit 333kSPS Sampling successive approximation

DAC: lt7541a.pdf 12 bit CMOS voltage, dac0830.pdf 8 bit CMOS voltage, dac08.pdf 8 bit current output

Sample/Hold: lt198sh.pdf

Analog Mux: lf13508.pdf

Op Amp (low voltage rail-to-rail) plus buffered reference: lm10.pdf

References REF-01/-02 (REF-01 is 10V and REF-02 is 5V) ref01.pdf