> I did something similar some time ago with the LPC2106, with an AD557 DAC. > That was when I found the limitation on the GPIO speed, I couldn't generate > a higher frequency than I could with an AVR. > > Leon Well, you're sure not going to implement a GHz digital radio, but it's fine for audio frequencies. I needed a fancy tone generator for a project -- it turns out to be damn near impossible to get the chip vendors who make melody ICs for cell phones to sell them in small quantities. So for $5 the LPC2132 works well for audio (and you can play .wav files too). If you slow it down the current is < 10 mA. Tom |