WM8734 Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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производитель

WM8734

Stereo Audio CODEC

Wolfson Microelectronics plc 

WM8734

Production Data

FROM DIGITAL

AUDIO

INTERFACE

DIGITAL

DE_EMPHASIS

MUTE

DIGITAL

INTERPOLATION

FILTER

TO LINE

OUTPUTS

DEEMP

DACMU

Figure 12 DAC Filter Schematic

The DAC digital filter can apply digital de-emphasis under software control, as shown in Table 3. The

DAC can also perform a soft mute where the audio data is digitally brought to a mute level. This

removes any abrupt step changes in the audio that might otherwise result in audible clicks in the

audio outputs.

REGISTER

ADDRESS

0000101

Digital Audio

Path Control

BIT

2:1

LABEL

DEEMP[1:0]

DEFAULT

00

3

DACMU

1

Table 3 DAC Software Control

DESCRIPTION

De-emphasis Control

(Digital)

11 = 48kHz

10 = 44.1kHz

01 = 32kHz

00 = Disable

DAC Soft Mute Control

(Digital)

1 = Enable soft mute

0 = Disable soft mute

DAC

The WM8734 employs a multi-bit sigma delta oversampling digital to analogue converter. The

scheme for the converter is illustrated in Figure 13.

FROM DAC

DIGITAL

FILTERS

TO LINE OUTPUT

Figure 13 Multi-Bit Oversampling Sigma Delta Schematic

The DAC converts the multi-level digital audio data stream from the DAC digital filters into high

quality analogue audio.

w

PD Rev 4.1 November 2006

20

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