TI IC 2812

[Tofflemire]

Hi All,

We are using the Texas Instruments IC (TMS320F2812PGFA,LQFP176,DSP) and having issues with the A to D converter. It seems that some have an offset voltage from 0 mV up to 50 mV which is causing some of other measurements to be off. Has anyone seen this and have a nice fix for this issue?

Tofflemire

 

[Noway2]

For the most part I have found that the F2812 is a great processor. The ADC, however, is not one of its strong points. According to the datasheet, there is a significant offset error on the part.

Look on TI's website for the application note on calibrating the ADC. The application note provides information on the theory of how to compensate for the ADC errors and provides some assembly language library routines that will do the trick.

Using these routines, and some oversampling with decimation and low pass filtering, I have acheived an accuracy within about .1% to .2% with the F2812's ADC.

 

[Tofflemire]

Hi Noway2

Thanks for you reply, we are going to calibrate the ADC.

Tofflemire