ADAU1701 SPI Mode, Speed and Pins.
Hello, how are you?
I have been using ADAU1701 with microcontroller, interfacing using i2c mode at 400Khz.
I would like to know what would be the maximum practical (safe) speed using it in SPI mode? The datasheet doesn't say it. Can I expect 1Mbps or more?
Would it be OK if I don't connect the COUT pin, so the DSP only receives data, but I can't read it back? Then I could get away with only 3 pins of the microcontroller.
Thank you very much!
Audio Signal Processors
SigmaDSP Audio Processors
adau1701
Hello,
Table 7. of datasheet: 6.25 MHz.
Yes, you do not need to connect COUT, as it is either three-stated or an output.
Regards,
Reinhard
Sorry I missed it! That should be the maximum speed, but can I operate at 1 Mhz? I intend to use an isolator, ADUM1401 that is pretty slow, so I have the slow down the bus because of it's propagation delay. Would that be OK?
Hello,
Table 7 states only minimum time values for the SPI clock. Therefore only the maximum clock frequency must be observed and you can clock the interface at 1 MHz.
Regards,
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