TMS320F28379D: Series resistor in external reference circuit

Anoop kumar N

Expert 1008 points

Part Number: TMS320F28379D

Dear

what is the purpose of this series resistors in ADC ref generation circuit.

Thanks and regards

Anoop

over 2 years ago

+1 Stefan Schiffer1 over 2 years ago

Prodigy 160 points

Hi Anoop,

I'm not 100% sure, but maybe the series resistor is used here to compensate for the effects of the capacitive load. www.ti.com/.../4080320453001 is a nice video in the TI Precision Labs series about this.

Regards, Stefan

+1 Benjamin Collier over 2 years ago in reply to Stefan Schiffer1

TI__Mastermind 36526 points

Stefan,

That is correct, thank you for sharing this helpful video. Remember that for a capacitor:

i = C(dv/dt) , so there are big current spikes to a capacitor when there is an insufficient current limiting resistor. This leads to the behavior shown in the video.

Best Regards,

Ben Collier

0 Anoop kumar N over 2 years ago in reply to Benjamin Collier

Expert 1008 points

Thank you stefan & Benjamin

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TMS320F28379D: Series resistor in external reference circuit