WM8912
Production Data
The direction of these signals and the clock frequencies are controlled as described in the “Digital
Audio Interface Control” section.
BCLK and LRCLK can be enabled as outputs in Slave mode, allowing mixed Master/Slave operation
- see “Digital Audio Interface Control”.
OPERATION WITH TDM
Time division multiplexing (TDM) allows multiple devices to transfer data simultaneously on the same
bus. The WM8912 supports TDM in master and slave modes for all data formats and word lengths.
TDM is enabled and configured using register bits defined in the “Digital Audio Interface Control”
section.
Figure 27 TDM with WM8912 as Master
Figure 28 TDM with other DAC as Master
Figure 29 TDM with Processor as Master
Note: The WM8912 is a 24-bit device. If the user operates the WM8912 in 32-bit mode then the 8
LSBs will be ignored on the DAC input. It is recommended to add a pull-down resistor to the
DACDAT line in TDM mode in this case.
PD, Rev 4.0, September 2010
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
