TMS320F28075: ADC Pins That Have Internal Capacitors or Resistors Which Cannot be Disabled - What is the Expected Tolerance?

Marc1

Part Number: TMS320F28075

The TMS320F28075 datasheet shows that the following dual use pins (ADC or Other function) have internal resistors or caps that are present regardless of pin mode (i.e. being used as ADC input).

ADCINA0 / DACOUTA - 50kOhm

ADCINA1 / DACOUTB - 50kOhm

ADCINB0 / VDAC - 100pF

ADCINB1 / DACOUTC - 50kOhm

Customer needs to know the tolerance of these internal resistors and capacitors for proper design analysis.

Please advise.

Kind Regards,

-Marc

over 8 years ago

0 Devin Cottier over 8 years ago

TI__Guru 60865 points

Hi Marc,

The variation in the parasitic DAC pull-down resistance is approximately +/-15% and the variation in the capacitance on the VDAC pin is approximately +/-10%.