additional audio input for adau1701

Yes, and one method would be using an ADAU1361:

http://www.analog.com/en/audiovideo-products/audio-codecs/adau1361/products/product.html

The steps for adding this to your system are as follows:

Supply the MCLK signal from the ADAU1701 to the ADAU1361's MCLK input pin. You should use a buffer if the MCLK signal is coming from the ADAU1701's crystal oscillator. Configure the ADAU1361's PLL for a 12.288 MHz input clock.

Connect the BCLK and LRCLK lines from the ADAU1701 to the ADAU1361's corresponding GPIO pins.

Connect the ADAU1361's ADC_DATA output to the ADAU1701's SDATA_IN pin.

Set the ADAU1701's serial port so that it is in master mode, and the ADAU1361's serial port so that it is in slave mode.

The data from the ADAU1361 will be available on pins 3 and 4 of the ADAU1701's input block in SigmaStudio.

There are other codecs that would fit this task as well, such as the SSM2603:

http://www.analog.com/en/audiovideo-products/audio-codecs/ssm2603/products/product.html

If you have a microcontroller booting your system, this is no problem. However, if you are using self-boot, this could be an issue. In that case, I would suggest using a separate ADAU1702 with a simple bypass bath that sends the ADC to the serial output. It is slightly more expensive than the ADAU1361 and SSM2603 solutions, but it contains its own selfboot functionality that will save you the cost of a microcontroller.

Thanks. Probably the second solution would be the way to go in this case. --Phil.

It is quite obvious that Brett is recommending a CODEC from Analog Devices, but if you are looking for a cheap A/D converter with the same performance as the internal ADC's of the ADAU1701, you should choose the UDA1361TS from NXP. Pricing is below USD 1.50 if you only buy a single one.

I have used the UDA1361 together with the ADAU1701 in different designs and it works without any probems at all.

Regards,

Robin

Robin, Thanks very much! Phil

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