Hi,Everyone
I am doing a project , using beaglebone black acquire the front end data from SPI interface . I have tested with internal stimulus (square wave provide by ADS 1299 itself) and external stimulus (sin wave provided by function generator) .The results is that I always get the spikes which are much bigger than the stimulus .I set the mode of ADS199 is Read Data Continuous Mode .Sequence of commands in your read cycle is that WAKEUP ,START,RDATAC,STOP,SDATAC,STANBY and also i use poll function to check the data ready signal during each transmission.
Besides when i choose the different SPI clock rate(I choose 1600000,800000,80000 HZ) ,the results are different . The higher the clock rate seems to have better result . But still can not completely avoid these strange big spike .
Has anyone has any ideas?
Thank you very much
Summer