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AM6548: AM6548 Unused ADC inputs

Part Number: AM6548

Hi all, 

I've got a question regarding unused ADC inputs on Sitara AM6548. On our PCB the space is very limited. Currently we are doing redesign of the PCB. In the previous version of the PCB we had followed instructions regarding unused pins connections (Chapter 4.5 from datasheet). Now we are looking into component count/PCB space reduction options. Is it possible to use one pull-down resistor to tie more than one unused ADC input pin to VSS? If yes, what would be the maximum number of unused pins which can be tied down this way?

Best regards,

Zoran Dukic