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RE: AD1955 and transformer I/V stage

Posted by Dave Davenport (M) on June 10, 2007 at 16:30:10

In Reply to: AD1955 and transformer I/V stage posted by SunRa on June 9, 2007 at 07:08:27:

Hi Florin,

You had asked if the RAKK dac output stages could suit the AD1955. The answer is no, not directly. You can't just pick up the RAKK dac design and use it with the AD1955.

Even though the AD1955 and the PCM1794 are both current output DACs, there are some important differences. The PCM1794 sources current while the AD1955 sinks current. That is, the AD1955 assumes external current sources for its current outputs. See page 13 of the AD1955 specification. Second, the AD1955 is referenced to 2.8V, while the PCM1794 is referenced to 0V, or ground.

So, although the concepts can be used, there will be some work to do to adapt the circuits.

Dave

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