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Old 3rd May 2011, 04:52 AM   #1
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Default Power R-2R ladder DAC?

Hi, I was wondering if making a power (that is, can drive a speaker) R-2R ladder DAC is feasible, let's say 16-bit?
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Old 3rd May 2011, 12:19 PM   #2
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R-2R ladders are current output DACs. They have high output impedance and should be loaded with a very low impedance load, such as virtual ground; the idea is that the voltage drop on the load should be small compared to the reference voltage of the DAC. A normal loudspeaker does not qualify as a low voltage drop load, so you would need an amplifier in between.

Also, you may view a Class D amplifier with digital control (e.g. TI's PurePath) as a power DAC, but those have their own issues.
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Old 3rd May 2011, 02:33 PM   #3
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'power' and 'R' are opposities
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