WM8768 Wolfson Microelectronics plc, WM8768 Datasheet - Page 19

• Manufacturer Part Number: WM8768
• Description: 24-bit, 192khz 8-channel Dac
• Manufacturer: Wolfson Microelectronics plc

Production Data
POWERDOWN MODES
w
DSP MODE B
In DSP mode B, the MSB of DAC channel 1 left data is sampled by the WM8768 on the first BCLK
rising edge following a LRCLK rising edge. DAC channel 1 right and DAC channels 2/3/4 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 8 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, DAC4 left, DAC4 right .
The WM8768 has powerdown control bits allowing specific parts of the WM8768 to be powered off
when not being used. The four stereo DACs each have a separate powerdown control bit, DACD[2:0]
& DACD4, allowing individual stereo DACs to be powered off when not in use. Setting DACD will
power down everything except the reference VMID. This 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.
BCKIN
LRCIN
DIN1
MSB
1
Input Word Length (IWL)
2
CHANNEL 1
LEFT
n-1
LSB
n
1
2
CHANNEL 1
RIGHT
n-1
n
CHANNEL 2
1
1/fs
LEFT
2
CHANNEL 4
RIGHT
n-1
n
NO VALID DATA
PD Rev 4.2 July 2005
WM8768
1
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