WM8608 datasheet(16/54 Pages) WOLFSON

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WM8608

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PP Rev 1.5 March 2004

Parameter

Group Delay

Unit

fs=48kHz

Unit

FL/FR/FC/SL/SR/RC channel

samples

1.0

SUB channel

samples

0.5

Table 9 Signal Path Group Delay

Key: FL = Front-Left, FR = Front-Right, FC = Front-Centre, SL = Surround-Left, SR = Surround-Right,

RL = Surround-Left, RR = Surround-Right, RC = Surround-Centre, SUB = Subwoofer

Note: The shorter delay on the SUB channel will not significantly affect audio performance. (It is

equivalent to moving the subwoofer forwards by about 15cm.)

DIGITAL AUDIO INTERFACE

The digital audio interface is used for inputting audio data into the WM8608. It uses five pins:

•

DINFRONT: Front L+R channel data input

•

DINSRND: Surround L+R channel data input

•

DINC_LFE: Front Centre (L) and LFE (R) channel data input

•

DINREAR: Rear L+R channel data input

•

LRCLK: Data alignment clock

•

BCLK: Bit clock, for synchronisation

The clock signals BCLK and LRCLK can be outputs when the WM8608 operates as a master, or

inputs when it is a slave (see Master and Salve Mode Operation, below).

MASTER AND SLAVE MODE OPERATION

The WM8608 can be configured as either a master or slave mode device. As a master device the

WM8608 generates BCLK and LRCLK and thus controls sequencing of the data transfer on the data

channels. In slave mode, the WM8608 receives data and clock signals over the digital audio

interface. The mode can be selected by writing to the MS bit (see Table 23). Master and slave modes

are illustrated below.

BCLK

LRCLK

DINFRONT

WM8608

PWM

Contoller

DSP

DECODER

DINSRND

DINREAR

DINC_LFE

BCLK

LRCLK

DINFRONT

WM8608

PWM

Contoller

DSP

DECODER

DINSRND

DINREAR

DINC_LFE

Master Mode

Slave Mode

Figure 8 Operation Mode

AUDIO DATA FORMATS

In Left Justified mode, the MSB is available on the first rising edge of BCLK following a LRCLK Audio

data is applied to the internal filters via the Digital Audio Interface. 5 popular interface formats are

supported:

•

Left Justified mode

•

Right Justified mode

•

2S mode

•

DSP mode A

•

DSP mode B

All 5 formats send the MSB first and support word lengths of 16, 20, 24 and 32 bits. Except that 32

bit data is not supported in right justified mode. DINFRONT, DINSRND, DINC_LFE, DINREAR and

LRCLK are sampled on the rising, or falling edge of BCLK.

In left justified, right justified and I

2S modes the digital audio interface receives data on the

DINFRONT, DINSRND, DINC_LFE and DINREAR inputs. Audio Data for each stereo channel is time

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