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DRV601: Asking for the DRV601 d/s figure 43k ohm design

SHH
Mastermind 30866 points
Part Number: DRV601

Hi Team,

Customer would like to know the following question for the DRV601 datasheet figure 15.

Q:

1. What is the gain for figure 15? 33k/15k=2V/V, right?

2. What is the 47kohm resistor purpose?

BR,

SHH

  • 0
    TI__Guru** 100755 points
    Hi SHH,

    1. Yes, the gain is set by dividing Rf/Ri so 33k/15k = 2.2V/V
    2. Each channel is configured in a Multiple Feedback Filter topology; the 47kohm resistor is part of this filter topology.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0
    Guru 140200 points
    Hi Shh,

    keep in mind that the DRV601 is wired as inverting OPAmp. So, a standard Low-Pass Sallen-Key architecture is not possible, but only a Low-Pass Multiple-Feedback architecture. This one needs one more resistor.

    See also here:

    www.ti.com/lit/an/sloa049b/sloa049b.pdf

    Kai