TUSB4020BI: decoupling capacitor for the TUSB4020

Ram Kumar

Part Number: TUSB4020BI

Hi ,

Data sheets informs to use 0.1uF as decoupling for the device where as Evaluation board schematics uses combination of 0.1uF,0.01uF and 0.001uF as decoupling capacitors,Which one is better for the device.

Regards

Ramkumar

over 5 years ago

0 Malik Barton57 over 5 years ago

TI__Guru 64326 points

Hi Ramkumar,

0.1uF decoupling cap is for Vbus where the 0.01uF and 0.001uF are used to help couple noise from ground to the shield of the USB connector. All cap should be used as shown on the EVM schematic. Datasheet recommendation is only referring to the decoupling of power (Vbus) on downstream connectors..

0 Ram Kumar over 5 years ago in reply to Malik Barton57

Prodigy 235 points

Hi,

Please refer page number 34 of the data sheet which clearly tells to use 0,1uF on VDD and VDD33 pins.so we have a drought which capacitors to be used.

0 Malik Barton57 over 5 years ago in reply to Ram Kumar

TI__Guru 64326 points

Hi Ram,

Datasheet is correct, 0.1 uF should be used on VDD and VDD33. 0.01uF and 0.001uF are used to help decouple noise of different frequencies, this capacitor are highly recommend to ensure a clean power supply.

0 Ram Kumar over 5 years ago in reply to Malik Barton57

Prodigy 235 points

Hi Malik,

ok Thank you.

Regards

Ramkumar

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TUSB4020BI: decoupling capacitor for the TUSB4020