WM8761

Production Data

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PD, Rev 4.6, October 2011

16

A diagram showing how the various Mute modes interact is shown below in Figure 11.

AUTOMUTED

(Internal Signal)

SOFTMUTE

(Internal Signal)

MUTE

PIN

Figure 11 Selection Logic for MUTE Modes

INPUT AUDIO FORMAT SELECTION

FORMAT (pin 13) controls the data input format.

FORMAT

INPUT DATA MODE

0

24 bit right justified

1

16–24 bit I

Table 3 Input Audio Format Selection

Notes:

1.

In 16-24 bit I

high for a minimum of data width BCKINs and low for a minimum of data width BCKINs,

unless Note 2. For data widths greater than 24 bits, the LSB’s will be truncated and the most

significant 24 bits will be used by the internal processing.

2.

If exactly 16 BCKIN cycles occur in both the low and high period of LRCIN the WM8761 will

assume the data is 16-bit and accept the data accordingly.

INPUT DSP FORMAT SELECTION

FORMAT

50% LRCIN DUTY CYCLE

LRCIN of 4 BCKIN or Less Duration

0

24-bit

(MSB-first, right justified)

DSP format – ‘late’ mode

1

Up to 24-bit I

(Philips serial data protocol)

DSP format – ‘early’ mode

Table 4 DSP Interface Formats

DE-EMPHASIS CONTROL

DEM (pin 12) is an input control for selection of de-emphasis filtering to be applied.

DEEMPH

DE-EMPHASIS

0

Off

1

On

Table 5 De-emphasis Control

DAC OUTPUT PHASE

In the DAC to analogue output, the analogue output data VOUTL/R, is a phase inverted

representation of the digital input signal.