WM8521
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A diagram showing how the various Mute modes interact is shown below in Figure 8.
AUTOMUTED
(Internal Signal)
10k
Ω
MUTE
PIN
SOFTMUTE
(Internal Signal)
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
16–32 bit I2S
1
Table 3 Input Audio Format Selection
INPUT DSP FORMAT SELECTION
FORMAT
LRCLK DATAWIDTH BCLKS
LRCLK OF 4 BCLK OR LESS DURATION
0
16 bit
16 bit DSP format – ‘late’ mode
(MSB-first, right justified)
1
I2S format up to 24 bit
16 bit DSP format – ‘early’ mode
(Philips serial data protocol)
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
On
1
Table 5 De-emphasis Control
PP Rev 1.3 December 2004
14
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