Спасибо! Собственно я уже разобрался. Но исправление в даташите как раз затрагивает мой вопрос:
В старой версии (A): Figure 42 is a block diagram showing RAM playback operation when the internal destination is the baseband data path. During playback to the baseband data path, the state machine increments/ decrements the RAM address at the baseband data rate (the address step rate is ignored by the state machine).
В новой версии ( B ) : Figure 42 is a block diagram showing RAM playback operation when the internal destination is the baseband data path. During playback to the baseband data path, the state machine increments/ decrements the RAM address at the baseband data rate (the address step rate must be set to 1).
Т.е. если "address step rate" не будет равен 1 - на спектроанализаторе ожидаемой картинки не увидишь. А формат данных RAM простой: верхние 16 бит signed Q, младшие 16 бит соответственно signed I.
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