If MCLK is shut down to save power, is the state of the 1701 maintained, or do you have to re-initialize/reconfigure each time the clock comes back on?
The memories in the ADAU1701 are volatile, meaning that their contents will be reset when the power is cycled. While the power is on, the individual data bits are stored in flip-flops that are continuously re-clocked by the incoming master clock. If the master clock goes away for an extended period of time, the contents of the memory may be corrupted. This is not something that we characterize in our testing of the IC, since the datasheet states that an MCLK signal must be present in order for the device to operate.
With this in mind, I would suggest always having an MCLK signal present, if possible. If the MCLK signal goes away for an extended period, you should re-program the entire memory in order to be certain that no memory loss has occurred.
Thanks for the help!
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