We would like to create a mixer circuit by Sigma DSP , We will have 2 stereo audio and 1 I2S input , but we would like to have Output equal to Analog input + I2S input , We are considering the ADAU1772 , But , not sure it can be achieved by ADAU1772 , can you help to confirm the function?
Unfortunately, the ADAU1772 would not be the right part for your needs. Although it has four ADCs, as well as an I2S input, the core can only process four audio channels at a time. You need four analog channels to be combined with two digital channels, which exceeds the ADAU1772's processing abilities.
I would recommend that you look into a multi-chip solution. Two ADAU1772s in sequence could handle the job you described. If you require additional processing power, you could also pair an ADC with one of our other SigmaDSP chips.
thanks for your description. When I going to mix the audio , we just need to mix 2channel analog and 1 I2S.
Is this possible for ADAU1772?
My apologies if I misunderstood -- you need to mix two channels of mono analog audio (one stereo pair), or two stereo analog channels (two stereo pairs)?
If you only have one stereo pair of analog audio and one I2S line, then the ADAU1772 is certainly capable!
Thanks for your replied , I'll test it in ADAU1772.