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ADC32RF55: Unused ports

Kei Kuwahara

Expert 8120 points

Part Number: ADC32RF55

Tool/software:

Hello team,

My customer is only going to use INA of this device.

Should we connect INB1P/M and INB2P/M to GND?

Also should we leave unused DOUT4 - 7 floating?
DOUT is Tx, so customer thinks floating should be okay.

Best Regards,
Kei Kuwahara

+1 Rob Reeder 1 month ago

TI__Mastermind 41440 points

Hi Kei-san,

INBP/M should be connected to the common mode voltage and 0.1uF cap to ground.

On the DOUTx - connect to 0.1uF cap to ground on each output.

Regards,

Rob

0 Kei Kuwahara 1 month ago in reply to Rob Reeder

TI__Expert 8120 points

Hi Rob-san,

Thank you!

Let me confirm, it is better to connect both INB1 and INB2 to VCM rather than GND. Correct?

Best Regards,
Kei Kuwahara

+1 Rob Reeder 1 month ago in reply to Kei Kuwahara

TI__Mastermind 41440 points

Correct, both INB1 and INB2 or any unused analog input needs to be connected to VCM and a 0.1uF cap to ground.

See attached:

Regards,

Rob

0 Kei Kuwahara 1 month ago in reply to Rob Reeder

TI__Expert 8120 points

Hi Rob-san,

Thank you, it is very clear!

Best Regards,
Kei Kuwahara