WM8733 datasheet(7/11 Pages) WOLFSON

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WM8733

WOLFSON MICROELECTRONICS LTD

PP Rev 1.3 July 2000

SERIAL DATA INTERFACE

WM8733 has serial interface formats that are fully compatible with both normal (MSB first, right-

justified) and I

2S interfaces. The data format is selected with the FORMAT pin. When FORMAT is

LOW, normal data format is selected. When the format is HIGH, I

2S format is selected.

If the application demands 16-bit or 20-bit data, then I

2S 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

DESCRIPTION

Normal format (MSB-first, right justified)

2S format (Philips serial data protocol)

Table 3 Serial Interface Formats

MSB

LSB

LEFT CHANNEL

RIGHT CHANNEL

LRCIN

BCKIN

DIN

AUDIO DATA WORD = 18-BIT

1/fs

161718

16 17 18

Figure 1 ‘Normal’ Data Input Timing

MSB

LSB

LEFT CHANNEL

RIGHT CHANNEL

LRCIN

BCKIN

DIN

AUDIO DATA WORD = 18-BIT

1/fs

16 17 18

Figure 2 I

2S Data Input Timing

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