Categories

Interfacing the DAC7564 to an MSP430

Posted on Tuesday, July 30th, 2013 in how-to, MSP430 by DP

sine_and_halfsine_delay_10ms

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).

This entry was posted on Tuesday, July 30th, 2013 at 6:00 pm and is filed under how-to, MSP430. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

3 Responses to “Interfacing the DAC7564 to an MSP430”

  1. Peter says:

    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?

  2. juani_c says:

    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.

  3. 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?

Leave a Reply

Notify me of followup comments via e-mail. You can also subscribe without commenting.

Recent Comments

  • Pekka Akselin: This is ridiculous!? :-) We are back at 256(!) byte EPROMs that needed multiple, a handful, of voltages to run! :-(
  • KH: Let's try a back-of-envelope calc balancing energies. From MCP1700 datasheet, there are graphs for a 200mA load step. Estimate the energy shortfall as 12uJ. Say...
  • Daniel: It's been a week and my comment is still awaiting moderation. Apparently the CIA doesn't want their involvement known?
  • KH: Agree, so okay, I guess he must have learned from somewhere. 100nF and 1000uF is so far apart, that was jarring; it's more magic incantation...
  • Max: I have a suspicion the hefty electrolytic cap might be some sort of cargo cult carry-over from other RF-based projects - for instance, I've seen...