WM1824

Production Data

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PD, Rev 4.1, December 2011

12

DEVICE DESCRIPTION

INTRODUCTION

supply line with minimal external components. The integrated DC servo eliminates the

requirement for external mute circuitry by minimising DC transients at the output during power

up/down. The device is well-suited to both stereo and multi-channel systems.

The device supports all common audio sampling rates between 8kHz and 192kHz using

common MCLK fs rates, with a slave mode audio interface.

The WM1824 supports a simple hardware control mode, allowing access to 24-bit LJ and I

audio interface formats, as well as a mute control. An internal audio interface clock monitor

automatically mutes the DAC output if the BCLK is interrupted.

DIGITAL AUDIO INTERFACE

The digital audio interface is used for inputting audio data to the WM1824. The digital audio

interface uses three pins:



DACDAT: DAC data input



LRCLK: Left/Right data alignment clock



BCLK: Bit clock, for synchronisation

The WM1824 digital audio interface operates as a slave as shown in Figure 5.

Figure 5 Slave Mode

INTERFACE FORMATS

The WM1824 supports two different audio data formats:



Left justified



I

Both of these modes are MSB first. They are described in Audio Data Formats on page 13.

Refer to the “Electrical Characteristics” section for timing information.