WM1811A datasheet(152/328 Pages) WOLFSON

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WM1811A

Production Data

PD, November 2013, Rev 4.1

152

DIGITAL AUDIO INTERFACE

The WM1811A provides digital audio interfaces for inputting DAC data and outputting ADCor Digital

Microphone data. Flexible routing options also allow digital audio to be switched or mixed between

interfaces without involving any DAC or ADC.

The WM1811A provides two full audio interfaces, AIF1 and AIF2. A third interface, AIF3, supports

Mono PCM digital audio paths to/from the AIF2 DSP functions. AIF3 can also be configured using

multiplexers to provide alternate connections to AIF1 or AIF2.

The digital audio interfaces provide flexible connectivity with multiple processors (eg. Applications

processor, Baseband processor and Wireless transceiver). A typical configuration is illustrated in

Figure 44.

Figure 44 Typical AIF Connections

In the general case, the digital audio interface uses four pins:



ADCDAT: ADC data output



DACDAT: DAC data input



LRCLK: Left/Right data alignment clock



BCLK: Bit clock, for synchronisation

In master interface mode, the clock signals BCLK and LRCLK are outputs from the WM1811A. In

slave mode, these signals are inputs, as illustrated below.

As an option (AIF1 only), a GPIO pin can be configured as the Left/Right clock for the ADC. In this

case, the LRCLK pin is dedicated to the DAC, allowing the ADC and DAC to be clocked

independently.

Four different audio data formats are supported each digital audio interface:



Left justified



Right justified



DSP mode

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