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AD9371: Why are DAC channels 32 bit when the data is 14 bit?

Question asked by htorke on Sep 12, 2016
Latest reply on Aug 2, 2017 by AdrianC

In the AD9371 reference design, there are 4 adc_data channels of 16 bits each which go through DMA to the ARM processor. However, the DAC channels going back to the transmitter are 32 bits each for every I and Q channel.

 

My understanding is that the ADC used is a 16 bit converter, so the ADC channels make sense, but I thought the DAC channels were only 14 bits, and the 2 least significant bits were dropped. If this is the case why are 32 bit channels used, and how is the data aligned in those channels?

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