DAC70004: Possible us of Ferrite bead on REFIN pin

Steven Shenker

Part Number: DAC70004

Hi there,

Would it be acceptable to use a ferrite bead on the REFIN pin? The bead I am thinking of (BLM18KG700JH1D) has a DC resistance of max 22 milliohm. I obviously do not want to affect the reference voltage accuracy.

Thanks in advance for your help.

over 2 years ago

0 Paul_Frost over 2 years ago

TI__Guru 53773 points

Hi Steven,

The DAC70004 features an internal reference buffer, so the input impedance for the reference pin is a static 15kΩ. The series bead would add a small amount of gain error, but ultimately not make much of an impact.

Thanks,

Paul

0 Steven Shenker over 2 years ago in reply to Paul_Frost

Intellectual 930 points

Thanks Paul.

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DAC70004: Possible us of Ferrite bead on REFIN pin