WM8733 Datasheet, PDF (7/11 Pages) Wolfson Microelectronics plc – 102dB Stereo DAC

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WM8733
SERIAL DATA INTERFACE
WM8733 has serial interface formats that are fully compatible with both normal (MSB first, right-
justified) and I²S interfaces. The data format is selected with the FORMAT pin. When FORMAT is
LOW, normal data format is selected. When the format is HIGH, I²S format is selected.
If the application demands 16-bit or 20-bit data, then I²S format may be used. Two LSBs will be lost
in 20-bit mode. Normal mode will support 18-bit data applications or 16-bit packed mode applications
(automatically detected).
Note: In 16-bit “packed” mode operation (exactly 32 BLCKS per LRCIN period) the data word must
align exactly with LRCIN clock edges (effectively both left and right justified at the same time).
FORMAT
0
1
DESCRIPTION
Normal format (MSB-first, right justified)
I²S format (Philips serial data protocol)
Table 3 Serial Interface Formats
1/fs
LRCIN
BCKIN
LEFT CHANNEL
DIN
AUDIO DATA WORD = 18-BIT
123
MSB
16 17 18
LSB
Figure 1 ‘Normal’ Data Input Timing
1/fs
RIGHT CHANNEL
123
MSB
16 17 18
LSB
LRCIN
BCKIN
LEFT CHANNEL
DIN
123
MSB
AUDIO DATA WORD = 18-BIT
Figure 2 I²S Data Input Timing
16 17 18
LSB
RIGHT CHANNEL
123
MSB
16 17 18
LSB
WOLFSON MICROELECTRONICS LTD
PP Rev 1.3 July 2000
7