LIS3DH ADC input impedance

[Tobias Rohde]

Posted on October 02, 2017 at 16:28

Hello, we are working with the ex ADC inside a LIS3DH MEMS.

Unfortunatly the input impedance/resistance of the ADC pins is not stated in the datasheet...

The ADC is used in conjungtion with an external resistor divider. For proper dimensioning we need to know this spec of the three ex ADC input channels. Can anyone help with this?

Thank you in advance!

T.R.

[Miroslav BATEK]

Posted on October 05, 2017 at 16:34

Input impedance for each ADC pin is equivalent to a 5pF capacitor between the pin and GND.

[JMarc.14]

Do you have a specification for the real (resistance) part of the input impedance? e.g. 1 Mohm, 3 Mohm, etc? I think this is was is being asked in the question and I am also after this information as it doesn't seem to be written anywhere in the data sheet. Thanks.