Juan has written an article detailing how to use an MSP430 with a DAC7564:
The DAC7564 is a low-power, voltage-output, four-channel, 12-bit digital-to-analog converter (DAC). The device includes a 2.5V, 2ppm/°C internal reference. The device is monotonic, provides very good linearity, and minimizes undesired code-to-code transient voltages (glitch).
Any idea why the green trace (half amplitude) is so glitchy compared to the red? Do you think it is an artifact or real? Can you hear popping or other noise when you hook up the output to an audio amp?
I’m not sure why is that. I was using a protoboard for the setup and a Launchpad as an oscilloscope so the whole thing was quite noisy, perhaps one of the channels picked up more interference than the other one.
Both traces looks absolutely horrible. If the signal really looks like this I’d call it completely unusable. I’m not so sure about the interference theory either…. The DAC can source up to 20mA at the output so you would need a damned lot of energy in the external interference to be able to override the DAC that much – like a lightning strike in the next room so so :-)
But the crap must come from somewhere? If you just connect the “oscilloscope” to the middle of two 100 ohm resistors connected to GND/VCC. How does it look then?