IMPLEMENTED SO FAR

- Support for 4x20 LCD Display and large number display
- Brightness and contrast adjustment with remote
- (OPUS/Wolfson WM8741) DAC volume control: remote and rotary encoder
- (OPUS/Wolfson WM8741) DAC random filter selection 1 to 5 with remote
- (OPUS/Wolfson WM8741) DAC upsampling selection (L, M, H -this is the OSR setting)
- I2C level shifting (5V to 3.3V)
- Optimized power-up sequence

Thursday, December 10, 2009

Musiland I2S Connection to WM8741 DAC

From the MCK compatibility chart we can see that for 44.1 KHz sample rate, 128fs is not supported in the Wolfson WM8741. But I wanted to try it anyway. (Recall that the Musiland output MCK is at 128fs)

It actually works and sounds well. However, when switching through the different internal upsampling options, only medium upsampling and no upsampling work. High upsampling does not work.

This means that the DAC is not working optimally. Perhaps using spdif rather than I2S is a better option for this DAC (Notice from the table that the BB DACs support 128fs with all sampling frequencies)

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