WM8994ECSSLASHR datasheet(166/363 Pages) CIRRUS

166 / 363 page

WM8994

166

Rev 4.6

DIGITAL AUDIO INTERFACE

The WM8994 provides digital audio interfaces for inputting DAC data and outputting ADC or Digital

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

interfaces without involving any DAC or ADC.

The WM8994 provides two full audio interfaces, AIF1 and AIF2. A third interface, AIF3, is partially

supported, using multiplexers to re-configure 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.

Audio Interface 1

Audio Interface 2

Audio Interface 3

Applications

Processor

Baseband

Processor

Wireless

Transceiver

WM8994

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 WM8994. In slave

mode, these signals are inputs, as illustrated below.

As an option, 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



I2S



DSP mode

All four of these modes are MSB first. They are described in the following sections. Refer to the

“Signal Timing Requirements” section for timing information.

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