# ACS758KCB Wiring Diagram

I am using the ACS758KCB Hall Effect sensor for a project. On the front page of the Datasheet it list a .1uF capacitor between Vcc and GND, in addition it lists a capacitor, Cf, between GND and VIOUT. It says that CF is for optimal noise management, with values that depend on the application. I am very new to electronics, so I do not know how to calculate the value for optimal noise reduction. Is there a specific formula? In addition it specifies Rf, what determines that value?

Thanks for any help, I really appreciate it, Joel

Cf and Rf form a first-order low-pass filter with a cutoff frequency $f_C = \frac {1}{2\pi R C}$. The response will be reduced to 0.707 (1/2 power) at that frequency. A first-order filter response only drops by -6dB/octave, so attenuation only increases gently.