WM8776 datasheet(21/57 Pages) WOLFSON

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Production Data

WM8776

PD Rev 4.0 April 2005

RIGHT JUSTIFIED MODE

In right justified mode, the LSB of DIN is sampled by the WM8776 on the rising edge of DACBCLK

preceding a DACLRC transition. The LSB of the ADC data is output on DOUT and changes on the

falling edge of ADCBCLK preceding a ADCLRC transition and may be sampled on the rising edge of

ADCBCLK. ADCLRC and DACLRC are high during the left samples and low during the right samples

(Figure 14).

LEFT CHANNEL

RIGHT CHANNEL

DACLRC/

ADCLRC

DACBCLK/

ADCBCLK

DIN/

DOUT

1/fs

n-2 n-1

LSB

MSB

n-2 n-1

LSB

MSB

Figure 14 Right Justified Mode Timing Diagram

2S MODE

In I

2S mode, the MSB of DIN is sampled by the WM8776 on the second rising edge of DACBCLK

following a DACLRC transition. The MSB of the ADC data is output on DOUT and changes on the

first falling edge of ADCBCLK following an ADCLRC transition and may be sampled on the rising

edge of ADCBCLK. ADCLRC and DACLRC are low during the left samples and high during the right

samples.

LEFT CHANNEL

RIGHT CHANNEL

DACLRC/

ADCLRC

DACBCLK/

ADCBCLK

DIN/

DOUT

1/fs

n-2 n-1

LSB

MSB

n-2 n-1

LSB

MSB

1 BCLK

Figure 15 I

2S Mode Timing Diagram

DSP MODES

In DSP/PCM mode, the left channel MSB is available on either the 1

st (mode B) or 2nd (mode A)

rising edge of BCLK (selectable by LRP) following a rising edge of LRC. Right channel data

immediately follows left channel data. Depending on word length, BCLK frequency and sample rate,

there may be unused BCLK cycles between the LSB of the right channel data and the next sample.

In device master mode, the LRC output will resemble the frame pulse shown in Figure 16 and Figure

17. In device slave mode, Figure 18 and Figure 19, it is possible to use any length of frame pulse

less than 1/fs, providing the falling edge of the frame pulse occurs greater than one BCLK period

before the rising edge of the next frame pulse.

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