View Full Version : adc and current limiting related ?

12-30-2011, 06:01 PM
Hi everyone,

i need the following need to be done for a physics experiement (four probe experiement) for a arts college.

- Measure voltage in the range of millivolt say 0 - 500 mv . i know it can be done with adc . what should be the reference voltage that i should give.

- make some circuit or need some ready made IC which can limit the current as per the input given . say if i give imput of 10 mA for MCU it must give 10 mA out and so on. Any suggestions for it.
i found the below 2
1) http://www.maxim-ic.com/app-notes/index.mvp/id/298
2) http://www.linear.com/product/LT3092

i think 2 nd one can interface with mcu.
what about 1 st one ?

can anyone suggest some good links or suggestions ?

Thank you

12-31-2011, 10:55 AM
if it is for measuring voltages, buy a ready made meter. It will be cheaper, and efficient.

As to limiting current, you can go for Application specific chips (Like the one you specified) OR

measure the current and adjust a digital potentiometer - you will need a transitor drive to supply the current.
Anyways, Application specific chips should do better.