WM8983_10 Datasheet, PDF (56/124 Pages) Wolfson Microelectronics plc – Mobile Multimedia CODEC with 1W Speaker Driver

WM8983
Production Data
Figure 29 Noise Gate Operation
OUTPUT SIGNAL PATH
The WM8983 output signal paths consist of digital application filters, up-sampling filters, stereo Hi-Fi
DACs, analogue mixers, stereo headphone and stereo line/mono/midrail output drivers. The digital
filters and DAC are enabled by register bits DACENL And DACENR. The mixers and output drivers
can be separately enabled by individual control bits (see Analogue Outputs). Thus it is possible to
utilise the analogue mixing and amplification provided by the WM8983, irrespective of whether the
DACs are running or not.
The WM8983 DACs receive digital input data on the DACDAT pin. The digital filter block processes
the data to provide the following functions:
• Digital volume control
• Graphic equaliser
• A digital peak limiter.
• Sigma-Delta Modulation
High performance sigma-delta audio DAC converts the digital data into an analogue signal.
Figure 30 DAC Digital Filter Path
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PD, Rev 4.3, May 2010
56