vsmGuy
Advanced Member level 2
photodiode adc
The PIC ADC requires that the input impedance be max 2.5k for fast operation.
Then, how I do go about interfacing photodiodes to the ADC without using something like opamps, because as far as I know photodiodes have very high impedance.
The circuit I have at mind is :
http://www.geocities.com/vimalsshankar/sch.png
Should it be that I have to adjust the value of R1 to be within specification ?
Please comment.
The PIC ADC requires that the input impedance be max 2.5k for fast operation.
Then, how I do go about interfacing photodiodes to the ADC without using something like opamps, because as far as I know photodiodes have very high impedance.
The circuit I have at mind is :
http://www.geocities.com/vimalsshankar/sch.png
Should it be that I have to adjust the value of R1 to be within specification ?
Please comment.