ADC Input impedance.

henrikalexander — Fri, 12 Dec 2014 14:49:45 GMT

Hi,

I'm a HW designer and is about to design a HW including a KEA64 MCU were we gonna do some ADC readings.

I'm trying to find out the input impedance for the ADC but cannot find this data in the data sheets for KEA64. The only thing if find is Hi-Z state but not what Hi-Z is.

The reasing I'm asking is if were are gonna need to buffer the analog input signal or not. Since this is a cost sensetive project we would like to skip the buffer stage.

And the resolution is not an issue for the input reading.

//Henrik A

Re: ADC Input impedance.

david_diaz — Thu, 18 Dec 2014 23:49:36 GMT

Hello Henrik,

I personally measured the resistance of one of the ADC inputs of the KEA02.

The resistance value is about 500 Kohms, and therefore, the ADC input impedance is HIGH.

Hope this information will be useful for you :smileyhappy:

Have a great day.

Kinetis Microcontrollers中的主题 ADC Input impedance.

ADC Input impedance.

Re: ADC Input impedance.