why need those 10K resistors to reduce input impedance?

[EDA_hg81]

The ISL59441 has input buffer but why need those 10K resistors to reduce input impedance?

Thank you for your answers.

 

[keith1200rs]

I assume they are to prevent the inputs floating, provide a DC reference point and supply the input bias current, not to reduce input impedance.

Keith

 

[biff44]

See those series caps? What do you think the gate's output would be without those pull down resistors?

 

[EDA_hg81]

You mean those 10K resistors are for making smooth edge?

Thank you for your answers.

---------- Post added at 13:43 ---------- Previous post was at 13:42 ----------

Just like High pass filter?

 

[keith1200rs]

No. Because the inputs are capacitively coupled you need to fix the DC level of the chip to somewhere - you cannot just let it float around.

Keith