TMS320F280049: ADC input resistance

Zane Wei

Tool/software:

Hi Team,

My customer wants to sample point 1 voltage. When give 12V input, it should be 3V, but when use ADC sample, it only have 2.7V.

Can you tell me why this happened? Do we have ADC equivalent impedance?

Best Regards,

Zane

0 Benjamin Collier over 2 years ago

Hi,

Please look in datasheet or TRM for ADC input circuit model.

Best Regards,

Ben Collier

0 Zane Wei over 2 years ago in reply to Benjamin Collier

Hi Ben,

I have seen that, but still don't know ADC equivalent impedance. Can you help me to understand the ADC input model?

Best Regards,

Zane

0 Benjamin Collier over 2 years ago in reply to Zane Wei

Zane,

I'm not sure that I understand your question. The model for the internal ADC circuit is shown.

Best Regards,

Ben Collier

C2000 microcontrollers forum