Howdy,

I'm trying to figure out how to generate a range of voltages between 0
and 150mV in 30mV steps (ie: 0, 30, 60, 90, 120, 150 mV).

I have pondered two methods so far but I am sure there is a simpler
method of doing this.

First method is to setup a PWM output to an RC filter with a unity gain
op amp for buffering. I've never done this before and everything I read
on PWM shows it operating in the 5V range. Maybe a scaling op amp on the
output?

Second method is to use a digital pot (DS1267) with the reference
voltage set to the maximum (150mV) and send some SPI messages to alter
the output.

Presently, I'm leaning towards the digital pot since I've used them
before and I know that it would probably work. But my spidey senses are
telling me that there is an simpler way of doing this.

Any ideas?

Thanks!

John

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu