Re: ADC input impedance?
Posted: Tue Jan 31, 2017 2:32 am
Yes, ADAFruit has not added a resistance divider do direct ADC input. The input leakage current of 50nA sounds correct so 20Mohms can't be far out.
-->
Open Community Forum for ESP8266, Come share Arduino and IoT (Internet of Things)
https://www.esp8266.com/
cerebrate wrote:Quick question, if I may - is the input impedance, or maximum input current, of the ESP8266-12 ADC pin documented anywhere? I haven't been able to find it in any of the spec sheets I've dug up.
Thanks in advance,
-c
temoto wrote:> The input impedance of the ADC is very high, in the range of 1MΩ.
Source: http://bbs.espressif.com/viewtopic.php?t=909