F2812: Proper termination of unused ADC port

allegrocantabile

Hi,

I am using three of the ADC input pins on F2812 and the rest of the pins are left open. Should the unused inputs (ADCINAx and ADCINBx) be terminated to GND directly or through 2.2k resistor?

Thanks for your help

over 16 years ago

0 allegrocantabile over 16 years ago

Prodigy 70 points

All,

I found the note in the manual, that those should be connected to the ground.

Question resolved.

Thanks!

0 Brett Larimore over 16 years ago

TI__Guru 57255 points

Hello,

For your information, SPRAAS1 is a very useful application note that goes through hardware design tips for the F28x series of MCUs. It is very useful for this type of question.

In this case it specifies that unused ADC inputs should be tied to analog ground.

Thank you,
Brett

0 allegrocantabile over 16 years ago in reply to Brett Larimore

Prodigy 70 points

Brett,

Thanks for the reply. Found the answer about the termination. Thanks for the suggested reading. It is helpful.

regards,

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F2812: Proper termination of unused ADC port