i8

ADC Power Supply Analysis

Core Audio ADC

As we can see here, we need the following power supplies:

  • 4 × 5V for AVDD
  • 2 × 5V for VBIAS
  • 2 × 3.3V for DVDD

We could provide all this with just 2 regulators, but I am very tempted to use 8 instead. If we do, we would use this earlier design. Then, we would have to decide how to integrate these 8 regulators. We pretty much have three options:

  • Directly on the ADC SO-DIMM module.
  • As separate boards mounted on the ADC SO-DIMM module.
  • As separate boards mounted on the backplane.

I will seek the advice of an expert for this relatively tricky question, but I am suspecting that we will end up going for the third option, for the following reasons:

  • The SO-DIMM module is likely to be too small for 8 boards.
  • This would decouple the ADC module’s design from its regulators.
  • This would make it easier to test different configurations.
Advertisements
Standard

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s