ADAU1701 Processing Latency?

Hello,

Sorry your question appears to have fallen through the cracks. How much latency is too much depends on exactly what sort of real-time application you've got in mind. In sound reinforcement work, latency below a few mS is often OK (it amounts to a few feet of sound travel). We have a 1701-based live-sound product whose latency is unnoticeable in use. On the other hand, stuff like noise-cancelling headphones need the sort of latency which only the ADAU1772 can deliver.

This post has more info on ADAU1701 latency and its causes:

https://ez.analog.com/message/215242?commentID=215242#comment-215242

In-out latency through the ADAU1701's I2S ports measures three samples total, including one sample for the core and its program (your project}. Of course, any explicit delays in your project add to this. In addition, the Feedback block includes a one-sample delay -- something to consider with homemade IIR filters and such. Most FIR filters add a delay averaging half their length, although this can vary with the filter's kernel (coefficient design).. IIR filters (such as EQ) have a complex delay stemming from their linear counterparts (often called group delay) which strictly speaking, isn't considered as latency.

The EVAL_ADUSB2EBZ is really the tiny interface board that comes with the actual -1701 eval board (EVAL-ADAU1701MINIZ). It connects your PC via USB to ADI's Sigma eval boards or your custom hardware.

Best regards,

Bob

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EZ Admin