MAX202: max202idg4

Daniele Spina

Prodigy 20 points

Part Number: MAX202

Can I remove the capacitor C3 (pin2-vcc)?

Can MAX202IDG4 work properly anyway?

Best regards

Daniele

over 4 years ago

0 Max Robertson over 4 years ago

TI__Guru 62910 points

Hi Daniele,

No, please don't do that. This capacitor is required for operation of the device's charge pump circuit. You can read more about it here:

Regards,

Max

0 Daniele Spina over 4 years ago in reply to Max Robertson

Prodigy 20 points

If I put this capacitor I've a noise on the 5v(vcc), this is the voltage referance for ADC then the value converted it's wrong. If I remove the capacitor the noise disappare and the comunication it's ok. Of course the 10V on the rs232 it's not wonderful but enought for the comunication.

The capacitor is 100nF ceramic. If you've a suggestion wil be highly appreciated

Best regards

Daniele

0 Hao L over 4 years ago in reply to Daniele Spina

TI__Mastermind 25705 points

Daniele,

What kind of noise do you observe with the capacitor? What kind of power design in the system? Have you ever checked if the noise correlates with to charging cycle? I was wondering if the transient current change makes the supply unstable.

Regards,

Hao

0 Max Robertson over 4 years ago in reply to Hao L

TI__Guru 62910 points

Daniele,

Do you have any updates on this issue? Or, have you had a chance to review Hao's questions?

Regards,
Max

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MAX202: max202idg4