wm8775 Wolfson Microelectronics plc, wm8775 Datasheet - Page 16

• Manufacturer Part Number: wm8775
• Description: 24-bit, 96khz Adc With 4 Channel I/p Multiplexer
• Manufacturer: Wolfson Microelectronics plc

WM8775
DIGITAL AUDIO INTERFACE
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MASTER AND SLAVE MODES
The audio interface operates in either Slave or Master mode, selectable using the MS control bit. In
both Master and Slave modes ADCDAT is always an output. The default is Slave mode.
In Slave mode (MS=0) ADCLRC and BCLK are inputs to the WM8775 (Figure 11). ADCLRC is
sampled by the WM8775 on the rising edge of BCLK. ADC data is output on DOUT and changes on
the falling edge of BCLK. By setting control bit BCLKINV the polarity of BCLK may be reversed so
that ADCLRC is sampled on the falling edge of BCLK and DOUT changes on the rising edge of
BCLK.
Figure 11 Slave Mode
In Master mode (MS=1) ADCLRC and BCLK are outputs from the WM8775 (Figure 12). ADCLRC
and BITCLK are generated by the WM8775. ADCDAT is output on DOUT and changes on the falling
edge of BCLK. By setting control bit BCLKINV, the polarity of BCLK may be reversed so that DOUT
changes on the rising edge of BCLK.
Figure 12 Master Mode
WM8775
WM8775
ADC
ADC
ADCLRC
ADCLRC
DOUT
DOUT
BCLK
BCLK
Controller
Controller
DVD
DVD
PD, Rev 4.4, October 2008
Production Data
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