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ADAU1701 I2S Input

Question asked by DefTech on Mar 21, 2012
Latest reply on Jun 5, 2012 by DefTech



I have a working ADAU1701 solution using Analog Inputs but need to add an external SPDIF with SRC @ 48k output to the design.

Setup as follows and attached jpegs:


1) ADAU1701 as Slave to external 256fs MCLK.

2) Data, BITCLK, and LRCLK connected to MP1-Input Sdata-1, MP4-Input LRCLK, MP5-Input BCLK and MCLKI

3) SCH Input Block 1,2,4 & 5 Active 

4) Programable MUX Nx2-1



Note: when using Analog input and SPDIF Not Locked signal throughput is good.


Note: when SPDIF locks and all data and clks present at ADAU1701,  MUX switched to I2S input 4&5, result is NO signal throughput.


What am I missing???


Are there any eval applications available with I2S functioning?


What is the 1701 expecting for BIT Clk rate 64fs?


Is I2S 24Bit input OK?