Wolfson stereo codec——WM8978

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1. The WM8978 digital audio interface can operate as a master or a slave.

2. An internal PLL can generate all required audio clocks for the CODEC from common reference clock frequencies, such as 12MHz and 13MHz.

3. 5-band Equaliser(record or playback)

4. On-chip PLL supporting 12, 13, 19.2MHz and other clocks

5. Support for 8, 11.025, 12, 16, 22.05, 24, 32, 44.1 and 48kHz sample rates

6. PLL pre-scaling and PLL N and K values should be set appropriately so that SYSCLK is no greater than 12.288MHz.

7. BCLK period should always be greater than or equal to MCLK period.

8. This interface is a 3 wire standard audio interface which supports a number of audio data formats including I2S, DSP/PCM Mode (a burst mode in which LRC sync plus 2 data packed words are transmitted), MSB-First, left justified and MSB-First, right justified, and can operate in master or slave modes.

9. WM8978 offers the normal audio DAC clocking scheme operation, where 256fs MCLK is provided to the DAC and ADC.

10. A 5-band EQ enables hi-fi playback to be customed to suit the user's preferences and the music style, while programmable filtering allows fixed-frequency noise (e.g. 217Hz) to be reduced in the digital domain.

11. P23

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