WM8510GEDSSLASHV datasheet(37/81 Pages) WOLFSON

37 / 81 page

Pre-Production

WM8510

PD Rev 4.1 December 2006

The WM8510 also has a Soft Mute function, which gradually attenuates the volume of the digital

signal to zero. When removed, 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 DACMU bit

to zero.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10

DAC Control

DACMU

DAC soft mute enable

0 = DACMU disabled

1 = DACMU enabled

Table 26 DAC Control Register

The digital audio data is converted to oversampled bit streams in the on-chip, true 24-bit digital

interpolation filters. The bitstream data enters a multi-bit, sigma-delta DAC, which converts it to a

high quality analogue audio signal. The multi-bit DAC architecture reduces high frequency noise and

sensitivity to clock jitter.

The DAC output defaults to non-inverted. Setting DACPOL will invert the DAC output phase.

AUTOMUTE

The DAC has an automute function which applies an analogue mute when 1024 consecutive zeros

are detected. The mute is release as soon as a non-zero sample is detected. Automute can be

disabled using the AMUTE control bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10

DAC Control

AMUTE

DAC auto mute enable

0 = auto mute disabled

1 = auto mute enabled

Table 27 DAC Auto Mute Control Register

DAC OUTPUT LIMITER

The WM8510 has a digital output limiter function. The operation of this is shown in Figure 19. In this

diagram the upper graph shows the envelope of the input/output signals and the lower graph shows

the gain characteristic.

Figure 19 DAC Digital Limiter Operation

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