WM8960 datasheet(31/92 Pages) WOLFSON

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Production Data

WM8960

PD, August 2013, Rev 4.2

OUTPUT SIGNAL PATH

The hi-fi DACs and DAC digital filters are enabled by register bits DACL and DACR. 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 WM8960, irrespective of

whether the DACs are enabled or not.

The WM8960 DACs receive digital input data on the DACDAT pin. The digital filter block processes

the data to provide the following functions:



Digital volume control with soft mute and soft un-mute



Mono mix



3D stereo enhancement



De-emphasis



Sigma-delta modulation

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

The analogue outputs from the DACs can then be mixed with the analogue line inputs and the ADC

analogue inputs. This mix is fed to the output drivers for headphone or speaker output. OUT3 can

provide a mono mix of left and right mixers or a pseudo-ground for capless headphone drive.

DIGITAL PLAYBACK (DAC) PATH

Digital data is passed to the WM8960 via the flexible audio interface to the hi-fi DACs. The DACs are

enabled by the DACL and DACR register bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R26 (1Ah)

Power

Management (2)

DACL

Left Channel DAC Enable

0 = DAC disabled

1 = DAC enabled

DACR

Right Channel DAC Enable

0 = DAC disabled

1 = DAC enabled

Table 14 DAC Enable Control

DIGITAL DAC VOLUME CONTROL

The signal volume from each DAC can be controlled digitally, in the same way as the ADC volume

(see Digital ADC Volume Control). The gain and attenuation range is –127dB to 0dB in 0.5dB steps.

The level of attenuation for an eight-bit code X is given by:

0.5

 (X-255) dB for 1  X  255;

MUTE for X = 0

The DACVU control bit controls the loading of digital volume control data. When DACVU is set to 0,

the LDACVOL or RDACVOL control data is loaded into an intermediate register, but the actual gain

does not change. Both left and right gain settings are updated simultaneously when DACVU is set to

See "Volume Updates" for more information on volume update bits.

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