WM8766 Wolfson Microelectronics plc, WM8766 Datasheet - Page 18

• Manufacturer Part Number: WM8766
• Description: 24-bit, 192khz 6-channel Dac
• Manufacturer: Wolfson Microelectronics plc

WM8766
POWERDOWN MODES
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DSP MODE A
In DSP mode A, the MSB of DAC channel 1 left data is sampled by the WM8766 on the second
rising edge on BCLK following a LRCLK rising edge. DAC channel 1 right and DAC channels 2 and 3
data follow DAC channel 1 left data (Figure 16).
Figure 16 DSP Mode A Timing Diagram – DAC Data Input
DSP MODE B
In DSP mode B, the MSB of DAC channel 1 left data is sampled by the WM8766 on the first BCLK
rising edge following a LRCLK rising edge. DAC channel 1 right and DAC channels 2 and 3 data
follow DAC channel 1 left data (Figure 17).
Figure 17 DSP Mode B Timing Diagram – DAC Data Input
In both DSP modes A and B, DACL1 is always sent first, followed immediately by DACR1 and the
data words for the other 6 channels. No BCLK edges are allowed between the data words. The word
order is DAC1 left, DAC1 right, DAC2 left, DAC2 right, DAC3 left, DAC3 right.
The WM8766 has powerdown control bits allowing specific parts of the WM8766 to be powered off
when not being used.
DACPD[2:0] allowing individual stereo DACs to be powered off when not in use. Setting DACPD[2:0]
will powerdown everything except the reference VMID may be powered down by setting PDWN.
Setting PDWN will override all other powerdown control bits. It is recommended that the DACs are
powered down before setting PDWN.
The three stereo DACs each have a separate powerdown control bit,
PD Rev 4.1 July 2005
Production Data
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