NEIL GANDLER wrote:
>
>  I would like to interface an LM34 temperature sensor to one
> of the PIC A/D inputs. My concern is induced noise on the lines
> leading from the LM34 to the PIC chip (about 4 inches of pcb trace)
> The circuitry will be on
> a double sided PCB. On the same board, atleast 3-4 inches away is
> a high current PWM power modulated at 50khz. I am concerned that
> this will cause errors in my LM34 value sensing. I would like to avoid
> using a buffer before the a/d, especially since the LM34 is considered
> to be a low impedence part. I am not sure adding an RC network before
> the PIC input would be
> effective, especially since I need to observe a maximium of 10k input
> impedence. Is runing the LM34 signal line, along with ground lines
> along the side, enough to reduce induced noise problems?
>
> Neil Gandler
Do you have the code space etc. to average several samples ? Tony M.