wm8782a Wolfson Microelectronics plc, wm8782a Datasheet - Page 11

• Manufacturer Part Number: wm8782a
• Description: 24-bit, 192khz Stereo Adc
• Manufacturer: Wolfson Microelectronics plc

Production Data
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DIGITAL AUDIO INTERFACE
The digital audio interface uses three pins:
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The digital audio interface takes the data from the internal ADC digital filters and places it on DOUT
and LRCLK. DOUT is the formatted digital audio data stream output from the ADC digital filters with
left and right channels multiplexed together. LRCLK is an alignment clock that controls whether Left
or Right channel data is present on the DOUT line. DOUT and LRCLK are synchronous with the
BCLK signal with each data bit transition signified by a BCLK high to low transition. DOUT is always
an output. BCLK and LRCLK are always inputs.
Three different audio data formats are supported:
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SLAVE MODE OPERATION
The WM8782A can be configured as a slave mode device. In slave mode, the WM8782A responds
with data to clocks it receives over the digital audio interface. The mode is selected by setting the MS
input pin (see Table 3 Slave selection below). Slave mode is illustrated below.
Table 3 Slave selection
AUDIO INTERFACE CONTROL
The Input Word Length and Audio Format mode can be selected by using IWL and FORMAT pins.
Table 4 Audio Data Format Control
Figure 4 Slave Mode
M/S
IWL
FORMAT
DOUT: ADC data output
LRCLK: ADC data alignment clock
BCLK: Bit clock, for synchronisation
Left justified
Right justified
I
2
S
PIN
PIN
Word Length
0 = 16 bit
1 = 20 bit
Z = 24 bit
Audio Mode Select
0 = RJ
1 = LJ
Z = I2S
Slave Selection
0 = Slave Mode
1= Reserved
DESCRIPTION
DESCRIPTION
PD, April 2010, Rev 4.8
WM8782A
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