WM8761 Production Data
w
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)
10k
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
2
S
Table 3 Input Audio Format Selection
Notes:
1. In 16-24 bit I
2
S 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 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
2
S format
(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.
