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WM8987L Datasheet(PDF) 35 Page - Wolfson Microelectronics plc |
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WM8987L Datasheet(HTML) 35 Page - Wolfson Microelectronics plc |
35 / 58 page Pre-Production WM8987L w PP Rev 3.0 January 2007 35 DIGITAL AUDIO INTERFACE The digital audio interface is used for inputting DAC data into the WM8987L and outputting ADC data from it. It uses five pins: • ADCDAT: ADC data output • ADCLRC: ADC data alignment clock • DACDAT: DAC data input • DACLRC: DAC data alignment clock • BCLK: Bit clock, for synchronisation The clock signals BCLK, ADCLRC and DACLRC can be outputs when the WM8987L operates as a master, or inputs when it is a slave (see Master and Slave Mode Operation, below). Three different audio data formats are supported: • I 2S • DSP mode • Left justified All of these modes are MSB first. They are described in Audio Data Formats, below. Refer to the Electrical Characteristic section for timing information. MASTER AND SLAVE MODE OPERATION The WM8987L can be configured as either a master or slave mode device. As a master device the WM8987L generates BCLK, ADCLRC and DACLRC and thus controls sequencing of the data transfer on ADCDAT and DACDAT. In slave mode, the WM8987L responds with data to clocks it receives over the digital audio interface. The mode can be selected by writing to the MS bit (see Table 23). Master and slave modes are illustrated below. Figure 11 Master Mode Figure 12 Slave Mode |
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