WM8960CGEFLSLASHV datasheet(33/94 Pages) CIRRUS

33 / 94 page

WM8960

Rev 4.4

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R20 (14h)

Noise Gate

Control

7:3

NGTH

[4:0]

00000

Noise gate threshold

00000

-76.5dBfs

00001

-75dBfs

… 1.5 dB steps

11110

-31.5dBfs

11111

-30dBfs

NGAT

Noise gate function enable

0 = disable

1 = enable

Table 13 Noise Gate Control

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

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