WM8772 datasheet(49/70 Pages) WOLFSON

49 / 70 page

Production Data

WM8772EFT – 32 PIN TQFP

PD Rev 4.1 October 2004

INPUT FORMAT SELECTION

In hardware mode, ML/I2S and MC/IWL become input controls for selection of input data format type

and input data word length for both the ADC and DAC.

ML/I2S

MC/IWL

INPUT DATA MODE

24-bit right justified

20-bit right justified

16-bit I

24-bit I

Table 19 Input Format Selection

Note:

In 24 bit I

2S mode, any width of 24 bits or less is supported provided that the left/right clocks

(ADCLRC and DACLRC) are high for a minimum of 24 bit clocks (ADCBCLK and DACBCLK) and

low for a minimum of 24 bit clocks.

DE-EMPHASIS CONTROL

In hardware mode, the MD/DM pin becomes an input control for selection of de-emphasis filtering to

be applied.

MD/DM

DE-EMPHASIS

Off

Table 20 De-emphasis Control

DIGITAL AUDIO INTERFACE

MASTER AND SLAVE MODES

The audio interface operates in either Slave or Master mode, selectable using the DACMS and

ADCMS control bits. In both Master and Slave modes DIN1/2/3 are always inputs to the

WM8772EFT and DOUT is always an output. The default is Slave mode for ADC and DAC.

In Slave mode, ADCLRC, DACLRC and ADCBCLK, DACBCLK are inputs to the WM8772EFT

(Figure 21). DIN1/2/3, ADCLRC and DACLRC are sampled by the WM8772EFT on the rising edge of

ADCBCLK and DACBCLK respectively. ADC data is output on DOUT and changes on the falling

edge of ADCBCLK.

By setting the control bit DACBCP the polarity of DACBCLK may be reversed so that DIN1/2/3 and

DACLRC are sampled on the falling edge of DACBCLK.

By setting the control bit ADCBCP the polarity of ADCBCLK may be reversed so that ADCLRC is

sampled on the falling edge of ADCBCLK and DOUT changes on the rising edge of ADCBCLK.

ADCLRC

DOUT

DACBCLK

DIN1/2/3

DACLRC

WM8772

CODEC

DSP

ENCODER/

DECODER

ADCBCLK

Figure 41 Slave Mode

In Master mode, ADCLRC, DACLRC, ADCBCLK and DACBCLK are outputs from the WM8772EFT

(Figure 22). ADCLRC, DACLRC, ADCBCLK and DACBCLK are generated by the WM8772EFT.

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