I need a total of three stereo inputs (six individual channels).
Two quick questions:
1) Can I do this and do you have device suggestions for the ADC's?
2) Will I be able to program the two new stereo ADC's in SigmaStudio? If so, how?
Yes, you can add another device into the SigmaStudio program so you can set the registers at the same time. The only small detail is that the 1701 will not be able to boot it up once you are using just your own hardware and not SigmaStudio. Then it will depend on the ADC you chose as to how to find a good solution. Several of the parts have a standalone mode.
First I would like to understand more about your application and what is important before recommending an ADC for the job. So what specifications will you need? What else is important for you?
Thanks for the reply. Basically I want to process 4 stereo inputs.
So I already have one stereo ADC on board and I'd like to add three more stereo ADC's.
Any ADI product selections for the 3 stereo ADC's would be greatly appreciated.
Also I'm not sure why this arrangement would not auto-boot?
Thanks in advance,
I am sorry, I misunderstood your question. My fault, you asked it clear enough.
We have the ADAU1372 which has four ADCs and two DACs. It can be configured for TDM 4 or TDM8 to interface into the 1701. It is a pretty good quality ADC but if you want higher quality then you could use the AD1974 or the ADAU1979. The choice comes down to your design goals and constraints.
Now the ADAU1372 and the AD1974 you can control with SigmaStudio. This allows you to easily change settings. When you click Compile/Link/Download it will load in the register settings for the parts provided all the proper addresses are set in hardware and in SigmaStudio. The problem comes when you selfboot the 1701. Those files are only for the DSP and not the ADCs. So you either have to have a micro-controller to program the ADCs or they must be in standalone mode. So before I go there, let me say that it is still good to have them in SigmaStudio for development. Then you can capture the settings and export them as an XML file or as a text file. So then you know what all the register writes will be.
So now the discussion on selfbooting the ADC/Codecs. The ADAU1372 will not selfboot so it is not good if you need to selfboot. The AD1974 does selfboot but it only does it at 48kHz fs AND in I2S format. It cannot boot up in TDM mode that you require. I did write an application note detailing a low cost solution for booting these up in different modes. http://www.analog.com/media/en/technical-documentation/application-notes/AN-1365.pdf
The ADAU1979 will operate in standalone mode and has a few options for the communications modes. It will do TDM and at 48k and 96kHz fs.
So have a look at all this to see if it is helpful.
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