WM8986GECOSLASHV datasheet(31/87 Pages) WOLFSON

31 / 87 page

Pre-Production

WM8986

PP, Rev 3.1, February 2007

The BOOST stage is enabled under control of the BOOSTEN register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

BOOSTENL

Left channel Input BOOST enable

0 = Boost stage OFF

1 = Boost stage ON

R2 (02h)

Power

management

BOOSTENR

Right channel Input BOOST enable

0 = Boost stage OFF

1 = Boost stage ON

Table 9 Input BOOST Enable Control

OUTPUT SIGNAL PATH

The WM8986 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 WM8986, irrespective of whether the

DACs are running or not.

The WM8986 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 and 3-D enhancement

A digital peak limiter.

Sigma-Delta Modulation

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

Figure 19 DAC Digital Filter Path

The analogue outputs from the DACs can then be mixed with the various analogue inputs. The mix is

fed to the output drivers for headphone (LOUT1/ROUT1, LOUT2/ROUT2) or line (OUT3/OUT4).

OUT3 and OUT4 have additional mixers which allow them to output different signals to the line

outputs.

DIGITAL PLAYBACK (DAC) PATH

Digital data is passed to the WM8986 via the flexible audio interface and is then passed through a

variety of advanced digital filters as shown in Figure 19 to the hi-fi DACs. The DACs are enabled by

the DACENL/R register bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DACENL

Left channel DAC enable

0 = DAC disabled

1 = DAC enabled

R3 (03h)

Power

Management 3

DACENR

Right channel DAC enable

0 = DAC disabled

1 = DAC enabled

Table 10 DAC Enable Control

The WM8986 also has a Soft Mute function, which when enabled, gradually attenuates the volume of

the digital signal to zero. When disabled, the gain will ramp back up to the digital gain setting. This

function is enabled by default. To play back an audio signal, it must first be disabled by setting the

SOFTMUTE bit to zero.

WM8986GECO/V Datasheet(PDF) 31 Page - Wolfson Microelectronics plc

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