WM8706

Production Data

w

PD Rev 4.1 July 2005

15

INPUT FORMAT SELECTION

In hardware mode, MLIIS (pin 28) and CSBIWO (pin 23) become input controls for selection of

input data format type and input data word length.

MLIIS

CSBIWO

INPUT DATA MODE

0

0

24-bit right justified**

0

1

20-bit right justified

1

0

16-bit I

1

1

24-bit I

Table 4 Input Format Selection

Note:

In 24 bit I

minimum of 24 BCKINs and low for a minimum of 24 BCKINs.

** This mode differs from the WM8716 which does 16-bit right justified in this mode.

The

previous mode is still available by using exactly 32 BCKIN per LRCIN cycle, 16 for left and

right. This mode is automatically detected within the hardware and overrides the data width

specified but not the format.

DE-EMPHASIS CONTROL

In hardware mode, MCDM1 (pin 27) and MDDM0 (pin 26) become input controls for selection

of de-emphasis filtering to be applied.

MCDM1

MDDM0

DE-EMPHASIS**

0

0

Off

0

1

48kHz

1

0

44.1kHz

1

1

32kHz

Table 5 De-emphasis Control

Note:

** The actual de-emphasis within the WM8706 is the same for all data rates. This differs from

WM8716 which has a different response for each sample rate.

SOFTWARE CONTROL INTERFACE

SELECTION OF CONTROL MODE

The WM8706 may be programmed to operate in hardware or software control modes. This is

achieved by setting the state of the MODE pin.

MODE

INTERFACE FORMAT

0

Hardware Control Mode

1

Software Control Mode

Table 6 Control Interface Mode Selection