WM8904
Pre-Production
DIGITAL MIXING
The ADC and DAC data can be combined in various ways to support a range of different usage
modes.
Data from either of the two ADCs can be routed to either the left or the right channel of the digital
audio interface. In addition, data from either of the digital audio interface channels can be routed to
either the left or the right DAC. See "Digital Audio Interface" for more information on the audio
interface.
The WM8904 provides a Dynamic Range Control (DRC) feature, which can apply compression and
gain adjustment in the digital domain to either the ADC or DAC signal path. This is effective in
controlling signal levels under conditions where input amplitude is unknown or varies over a wide
range.
The DACs can be configured as a mono mix of the two audio channels. Digital sidetone from the
ADCs can also be selectively mixed into the DAC output path.
DIGITAL MIXING PATHS
Figure 35 shows the digital mixing paths available in the WM8904 digital core.
Figure 35 Digital Mixing Paths
PP, Rev 3.3, September 2012
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
