Quote Originally Posted by sportbike View Post
According to this link: http://arduino-info.wikispaces.com/A...-PWM-Frequency
It appears the PWM output may only be 1khz.

I happen to be working on an IR temperature sensor that outputs a PWM duty cycle variant signal at 1kHz and am looking at analog conversion options.


I found this article with links to a schematic for using a 74HC4053 chip to pretty much eliminate ripple. The output update rate seems to match the input PWM update rate. Would be plenty for a pulse feature. I haven't really looked into it too much but I do have interest in trying to get the PWM output of the sensor I am working with into a usable analog output.

http://www.edn.com/design/analog/432...most-no-ripple

The circuit in the link in the quote should give you a pretty stable output. I bought the chips and then realized it needs a balanced clocking input on one of the channels rather than just the varying duty cycle PWM signal. My sensor application only has the varying output signal and no clock signal running at the same frequency.