DAC43401: Can the output be connected to a 3 in wire - what issues would this cause?

Lauren Mayfield

Part Number: DAC43401

Hi DAC team,

My customer wants to use the output of this device to connect to another board via a 3 inch wire. Should he be concerned about signal degradation? Any suggestions to mitigate that without adding an additional part?

Thanks,
Lauren

over 3 years ago

0 Akhilesh K over 3 years ago

TI__Mastermind 18546 points

Hi,

DAC43401 can handle capacitor loads up-to 1nF comfortably. So with 3 inch wire I am not seeing any issues, unless the capacitance of that cable is more than 1nF which is highly unlikely for a 3 inch cable.

Let me know if you need more help.

Regards,

0 Lauren Mayfield over 3 years ago in reply to Akhilesh K

TI__Expert 6910 points

Hi AK,

Thanks for your reply.

Actually one thing I should have mentioned is they're planning on using a 0.1uF cap on the output (then connected to ground). I did a quick calculation and looks like that will be lower than the min allowed output impedance.

Can you confirm that they cannot/should not do that?

Thanks,

Lauren

0 Lauren Mayfield over 3 years ago in reply to Lauren Mayfield

TI__Expert 6910 points

Hi AK,

Any update on this?

Thanks!
Lauren

0 Akhilesh K over 3 years ago in reply to Lauren Mayfield

TI__Mastermind 18546 points

DAC43401 cannot drive 0.1uF cap load at its output. DAC will not be stable. You should have a small series resistor (10 to 22 ohms) to isolate the cap load.

Regards,

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DAC43401: Can the output be connected to a 3 in wire - what issues would this cause?