WM8726
Production Data
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 13) controls the data input format.
FORMAT
INPUT DATA MODE
0
16 bit right justified
16–24 bit I2S
1
Table 3 Input Audio Format Selection
Notes:
1. In 16-24 bit I2S mode, any data from 16-24 bits or more is supported provided that LRCIN is
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 WM8726 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
16 bit
DSP format – ‘late’ mode
(MSB-first, right justified)
1
I2S format up to 24 bit
DSP format – ‘early’ mode
(Philips serial data protocol)
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
On
1
Table 5 De-emphasis Control
PD Rev 4.1 September 2005
14
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
