1 / 9

MUSIC DAC/ADC PCB

MUSIC DAC/ADC PCB. Rick Raffanti Nov 23, 2010. Circuit changes. Add ADR441 reference, U108 Add loopback filters Change U103 from LM1117-5 to LP3856-5 (lower dropout v, bigger pkg). ADC chips- 2.6W each. Heatsink- thermal tape mount (couldn’t find screw-attach type). Thermal plane model.

leblancc
Download Presentation

MUSIC DAC/ADC PCB

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. MUSIC DAC/ADC PCB Rick Raffanti Nov 23, 2010

  2. Circuit changes • Add ADR441 reference, U108 • Add loopback filters • Change U103 from LM1117-5 to LP3856-5 (lower dropout v, bigger pkg)

  3. ADC chips- 2.6W each

  4. Heatsink- thermal tape mount(couldn’t find screw-attach type)

  5. Thermal plane model

  6. Thermal model- 1 oz plane

  7. Thermal model- Spice Placed power sources roughly where they are on existing designs, on 20cm by 12cm grid Used 5 ea 0.5C/W mounting screws each edge Used 23.7C/W junction-ambient for ADC chips

  8. ADC chip junction temp rise • Single 1 oz plane: L 49C, R 54C (above ambient) • Single 3 oz plane: L 36C, R 42C • Add 4 1C/W mounting points near each ADC chip (8 in all): • L 27C, R 28C • Moved 1.8W regulator near RH edge- L 27C, R 28C • Single 6 oz plane (=? 2 3oz planes): L 18C, R 19C

More Related