WM8510GEDSSLASHV datasheet(36/81 Pages) WOLFSON

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WM8510

Production Data

PD Rev 4.1 December 2006

Figure 18 DAC Digital Filter Path

The analogue output from the DAC can then be mixed with the MIC2 analogue input and the ADC

analogue input. The mix is fed to the output drivers, SPKOUTP/N, and MONOOUT.

MONOOUT: can drive a 16

Ω or 32Ω headphone or line output or can be a buffered version of VMID

(When MONOMUTE=1).

SPKOUTP/N: can drive a 16

Ω or 32Ω stereo headphone or stereo line output, or an 8Ω BTL mono

speaker.

DIGITAL HI-FI DAC VOLUME CONTROL

The signal volume from each Hi-Fi DAC can be controlled digitally. 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

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R11

DAC Digital

Volume

7:0

DACVOL

[7:0]

11111111

( 0dB )

DAC Digital Volume Control

0000 0000 = Unused

0000 0001 = -127dB = mute

0000 0010 = -126.5dB

... 0.5dB steps up to

1111 1111 = 0dB

Table 23 DAC Volume

HI-FI DIGITAL TO ANALOGUE CONVERTER (DAC)

Digital ‘de-emphasis’ can be applied to the audio data if necessary. De-emphasis filtering is available

for sample rates of 48kHz, 44.1kHz and 32kHz.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10

DAC Control

5:4

DEEMPH

De-Emphasis Control

00 = No de-emphasis

01 = 32kHz sample rate

10 = 44.1kHz sample rate

11 = 48kHz sample rate

Table 24 De-Emphasis

The DAC is enabled by the DACEN register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

Management 3

DACEN

DAC enable

0 = DAC disabled

1 = DAC enabled

Table 25 DAC Enable

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