WM8569_06 Wolfson Microelectronics Ltd., WM8569_06 Datasheet - Page 27

• Manufacturer Part Number: WM8569_06
• Description: 24-bit, 192khz Stereo Codec with Volume Control
• Manufacturer: Wolfson Microelectronics Ltd.

Production Data
w
ADC DIGITAL AUDIO INTERFACE CONTROL REGISTER
Interface format is selected via the ADCFMT[1:0] register bits:
The ADCIWL[1:0] bits are used to control the input word length.
Note: 32-bit right justified mode is not supported.
In all modes, the data is signed 2's complement.
ADC MASTER MODE SELECT
Control bit ADCMS selects between audio interface Master and Slave Modes. In Master mode
ADCLRC and ADCBCLK are outputs and are generated by the WM8569. In Slave mode ADCLRC
and ADCBCLK are inputs to WM8569.
MASTER MODE ADCLRC FREQUENCY SELECT
In Master mode the WM8569 generates ADCLRC and ADCBCLK. These clocks are derived from the
master clock and the ratio of ADCMCLK to ADCLRC is set by ADCRATE.
ADC OVERSAMPLING RATE SELECT
For ADC operation at 96kHz it is recommended that the user set the ADCOSR bit. This changes the
ADC signal processing oversampling rate to 64fs. The 64fs oversampling rate is only available in
modes were a 96KHz rate is supported, i.e. 256fs or 384fs. In all other modes the ADC will stay in a
128fs oversampling rate irrespective of what this bit is set to.
ADCLRC and ADCBCLK
ADC Oversampling Rate
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
Frequency Select
Interface Control
Interface Control
Interface Control
0001011
0001011
0001011
0001011
0001011
BIT
1:0
BIT
3:2
BIT
BIT
7:5
BIT
4
8
ADCRATE [2:0]
ADCFMT[1:0]
ADCIWL[1:0]
ADCOSR
LABEL
ADCMS
LABEL
LABEL
LABEL
LABEL
DEFAULT
DEFAULT
DEFAULT
DEFAULT
DEFAULT
0
00
00
0
010
ADC Oversampling Rate Select:
Interface Format Select
ADC Audio Interface
Master/Slave Mode Select:
0: 128x oversampling
1: 64x oversampling
Master Mode
ADCMCLK:ADCLRC Ratio
Select:
00: Right justified mode
01: Left justified mode
10: I
11: DSP mode A or B
0: Slave mode
1: Master mode
010: 256fs
011: 384fs
100: 512fs
101: 768fs
Input Word Length
2
DESCRIPTION
S mode
DESCRIPTION
DESCRIPTION
01: 20 bit data
10: 24 bit data
11: 32 bit data
DESCRIPTION
00: 16 bit data
DESCRIPTION
PD Rev 4.0 June 2006
WM8569
27