wm8961 Wolfson Microelectronics plc, wm8961 Datasheet - Page 58

• Manufacturer Part Number: wm8961
• Description: Ultra-low Power Stereo Codec With 1w Stereo Class D Speaker Drivers And Ground Referenced Headphone Drivers
• Manufacturer: Wolfson Microelectronics plc

DIGITAL AUDIO INTERFACE
w
WM8961
The digital audio interface is used for inputting DAC data into the WM8961 and outputting ADC data
from it. It uses four pins:
•
•
•
•
The clock signals BCLK and LRC can be an output when the WM8961 operates as a master, or an
input when it is a slave (see Master and Slave Mode Operation, below).
Four different audio data formats are supported:
All four of these modes are MSB first. They are described in Audio Data Formats, below. Refer to the
Electrical Characteristic section for timing information.
MASTER AND SLAVE OPERATION
The WM8961 can be configured as either a master or slave mode device. As a master device the
WM8961 generates BCLK and LRC and thus controls sequencing of the data transfer on ADCDAT
and DACDAT. In slave mode, the WM8961 responds with data to clocks it receives over the digital
audio interface. Master and slave modes are illustrated below.
Figure 29 Master Mode
•
•
•
•
ADCDAT: ADC data output
DACDAT: DAC data input
LRC: DAC and ADC data alignment clock
BCLK: Bit clock, for synchronisation
Left justified
Right justified
I
DSP mode
2
S
Figure 30 Slave Mode
PP, August 2009, Rev 3.1
Pre-Production
58