WM8978GEFLSLASHV datasheet(52/119 Pages) WOLFSON

No de pièce	WM8978GEFL/V

Description	Stereo CODEC With Speaker Driver

PDF	119 Pages

Scroll/Zoom	100%

Fabricant	WOLFSON [Wolfson Microelectronics plc]

Site Internet	http://www.wolfsonmicro.com

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52 / 119 page

WM8978

Pre-Production

PP Rev 3.0 May 2006

Figure 25 Noise Gate Operation

OUTPUT SIGNAL PATH

The WM8978 output signal paths consist of digital application filters, up-sampling filters, stereo Hi-Fi

DACs, analogue mixers, speaker, 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 WM8978, irrespective of

whether the DACs are enabled or not.

The WM8978 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

Digital peak limiter.

Sigma-Delta Modulation

High performance sigma-delta 24-bit audio DAC converts the digital data into an analogue signal.

WM8978GEFL/V Fiches technique(PDF) 52 Page - Wolfson Microelectronics plc