WM8756 datasheet(16/39 Pages) WOLFSON

16 / 39 page

WM8756

Advance Information

AI Rev 1.3 October 2001

SPLIT RATE MODE

The WM8756 can be used with differing sample rates on the front and rear channels.

This allows

extremely high quality audio to be played on the front two channels whilst the other channels use normal

high quality data streams.

This mode will only work with a front data rate of 192kHz and a rear rate of 96kHz but can be used with all

the normal data formats except the two DSP modes and with the system at either 128fs or 192fs see

Figure 11.

When running in split rate mode all the channels are clocked in using a common BCKIN; the front

channels using LRCIN and all the other channels using LRCIN2 see Figure 11.

LEFT CHANNEL

RIGHT CHANNEL

LRCIN

BCKIN

DIN0

2/fs

LSB

MSB

LSB

MSB

LEFT CHANNEL

RIGHT CHANNEL

LSB

MSB

LSB

MSB

LSB

MSB

DIN1/2

LRCIN2

LEFT CHANNEL

RIGHT CHANNEL

Figure 11 Split Rate Audio Mode Timing Diagram

Notes:

1. Figure 11 shows the timing for left justified. However, this is similar for right justified and I2S.

2. The edges of LRCIN and LRCIN2 must be coincidental.

WM8756 Datasheet(PDF) 16 Page - Wolfson Microelectronics plc