WM8521

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PP Rev 1.3 December 2004

14

A diagram showing how the various Mute modes interact is shown below in Figure 8.

AUTOMUTED

(Internal Signal)

10k

Ω

Ω

Ω

Ω

SOFTMUTE

(Internal Signal)

MUTE

PIN

Figure 8 Selection Logic for MUTE Modes

INPUT AUDIO FORMAT SELECTION

FORMAT (pin 12) controls the data input format.

FORMAT

INPUT DATA MODE

0

16 bit right justified

1

16–32 bit I

Table 3 Input Audio Format Selection

INPUT DSP FORMAT SELECTION

FORMAT

LRCLK

DATAWIDTH BCLKS

LRCLK OF 4 BCLK OR LESS DURATION

0

16 bit

(MSB-first, right justified)

16 bit DSP format – ‘late’ mode

1

I

(Philips serial data protocol)

16 bit DSP format – ‘early’ mode

Table 4 DSP Interface Formats

DE-EMPHASIS CONTROL

DEEMPH (pin 11) 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