ADS8556: unused analog pin

Ryoma Ohashi

Expert 3250 points

Part Number: ADS8556

Hi team,

Is it OK to left open the analog unused pin? (e.g. CH_A0)

Regards
Ohashi

5 months ago

+1 Tom Hendrick 5 months ago

TI__Guru**** 173096 points

Hi Ryoma,

Please tie the unused inputs to analog ground - with a zero ohm resistor if you have space. Always nice to have a spare ADC channel when you need it...

0 Ryoma Ohashi 5 months ago in reply to Tom Hendrick

TI__Expert 3250 points

Hi Tom,

Thanks for your answer. Got it that it has to be tied to AGND.

COuld you tell me what likely to happen if it is left open? (unexpected output happens / might damage etc.)

Regards
Ohashi

+1 Tom Hendrick 5 months ago in reply to Ryoma Ohashi

TI__Guru**** 173096 points

Increased noise on adjacent channels is possible, not likely that you would damage the chip though.

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ADS8556: unused analog pin