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WM8987L Datasheet(PDF) 35 Page - Wolfson Microelectronics plc

Part # WM8987L
Description  Stereo CODEC for Portable Audio Applications
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8987L Datasheet(HTML) 35 Page - Wolfson Microelectronics plc

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Pre-Production
WM8987L
w
PP Rev 3.0 January 2007
35
DIGITAL AUDIO INTERFACE
The digital audio interface is used for inputting DAC data into the WM8987L and outputting ADC data
from it. It uses five pins:
ADCDAT: ADC data output
ADCLRC: ADC data alignment clock
DACDAT: DAC data input
DACLRC: DAC data alignment clock
BCLK: Bit clock, for synchronisation
The clock signals BCLK, ADCLRC and DACLRC can be outputs when the WM8987L operates as a
master, or inputs when it is a slave (see Master and Slave Mode Operation, below).
Three different audio data formats are supported:
I
2S
DSP mode
Left justified
All 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 MODE OPERATION
The WM8987L can be configured as either a master or slave mode device. As a master device the
WM8987L generates BCLK, ADCLRC and DACLRC and thus controls sequencing of the data
transfer on ADCDAT and DACDAT. In slave mode, the WM8987L responds with data to clocks it
receives over the digital audio interface. The mode can be selected by writing to the MS bit (see
Table 23). Master and slave modes are illustrated below.
Figure 11 Master Mode
Figure 12 Slave Mode


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