Hi everyone, I am looking for a floating point evaluation board that has easy audio inputs (such as rca or 3.5mm jacks) and a SAR adc. I have almost exactly what I want in the ADSP BF533 but I am getting a group delay due to the sigma-delta converter. Some of you on here let me know that I needed to use a SAR adc for feedback control applications. So I need to find a new evaluation board with similar characteristics as the BF533 but w/ the SAR adc. Thanks for your help, Zach
Finding the right DSP evaluation board
Started by ●August 28, 2003
Reply by ●August 28, 20032003-08-28
"Zach R." wrote:> > Hi everyone, > I am looking for a floating point evaluation board that has easy > audio inputs (such as rca or 3.5mm jacks) and a SAR adc. I have > almost exactly what I want in the ADSP BF533 but I am getting a group > delay due to the sigma-delta converter. Some of you on here let me > know that I needed to use a SAR adc for feedback control applications. > So I need to find a new evaluation board with similar characteristics > as the BF533 but w/ the SAR adc. > > Thanks for your help, > ZachProbably the most straightforward way is to ignore the on-board converter and kludge on your own. Use an address decoder on the expansion connector. (You can add extra memory while you're at it. The cache chips from an old motherboard are worth looking at.) Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●August 28, 20032003-08-28
"Zach R." wrote:> > Hi everyone, > I am looking for a floating point evaluation board that has easyBF is not a floating point engine. I assume the fp capabilities are not critical for you.> audio inputs (such as rca or 3.5mm jacks) and a SAR adc.That is contradictory. All audio ADCs that I know are of delta-sigma type. The typical pipelining delay is several dozens of sample rate periods.> almost exactly what I want in the ADSP BF533 but I am getting a group > delay due to the sigma-delta converter.You can boost up the sample rate to reduce the delay to acceptable, or you can attach the SAR ADC of your own.> So I need to find a new evaluation board with similar characteristics > as the BF533 but w/ the SAR adc.Why can't you use just a microcontroller with built-in SAR instead of DSP? There are numerous eval boards available. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com> > Thanks for your help, > Zach