DAC8750: Should HART-IN terminal be connected to GND directly when the terminal is not used?

Kazuya Nakai59

Guru 20750 points

Part Number: DAC8750

Hello guys,

One of my customers is evaluating DAC8750 to replace AD5420 with the device.

For the evaluation, they have the following question.

Could you please give me your reply?

Q. Should HART-IN terminal be connected to GND directly or is open OK because AD5420 doesn't have HART-IN terminal.

Your reply would be much appreciated.

Best regards,

Kazuya.

over 4 years ago

0 Kevin Duke over 4 years ago

TI__Mastermind 46290 points

Nakai-san,

I would say my suggestion is that the HART-IN pin is AC coupled to GND as we have demonstrated in the EMC/EMI reinforced reference design (https://www.ti.com/tool/TIPD153), however this is not necessarily required. This is just the optimal suggestion to prevent the HART-IN high-impedance input node from potentially allowing for EMC/EMI sources to be coupled into the output.

This is a conservative, non-required suggestion.

0 Kazuya Nakai59 over 4 years ago in reply to Kevin Duke

Guru 20750 points

Hello Kevin,

Thank you very much for your reply.

Your reply is very helpful for the customer and me.

Thank you again and best regards,

Kazuya.

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DAC8750: Should HART-IN terminal be connected to GND directly when the terminal is not used?