WM8951L_07 WOLFSON [Wolfson Microelectronics plc], WM8951L_07 Datasheet - Page 26

• Manufacturer Part Number: WM8951L_07
• Description: Stereo ADC with Microphone Input and Clock Generator
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8951L
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Sample rates listed in the following sections are supported.
Table 11 Sample Rate Control
NORMAL MODE SAMPLE RATES
In normal mode MCLK/crystal oscillator is set up according to the desired sample rates of the ADC.
For ADC sampling rates of 8, 32, 48 or 96kHz, MCLK frequencies of either 12.288MHz (256fs) or
18.432MHz (384fs) can be used. For ADC sampling rates of 8, 44.1 or 88.2kHz from MCLK
frequencies of either 11.2896MHz (256fs) or 16.9344MHz (384fs) can be used.
Table 12 should be used to set up the device to work with the various sample rate combinations. For
example if the user wishes to use the WM8951L in normal mode with the ADC sample rate at 48kHz
then the device should be programmed with BOSR = 0, SR3 = 0, SR2 = 0, SR1 = 0 and SR0 = 0 with
a 12.288MHz MCLK or with BOSR = 1, SR3 = 0, SR2 = 0, SR1 = 0 and SR0 = 0 with a 18.432MHz
MCLK. The ADC will then operate with a Digital Filter of type 1, refer to Digital Filter Characteristics
section for an explanation of the different filter types.
0001000
Sampling
Control
REGISTER
ADDRESS
0
1
5:2
BIT
USB/
NORMAL
BOSR
SR[3:0]
LABEL
0
0
0000
DEFAULT
Mode Select
1 = USB mode (250/272fs)
0 = Normal mode (256/384fs)
Base Over-Sampling Rate
USB Mode
0 = 250fs
1 = 272fs
Sample rate control;
See USB Mode and Normal Mode
Sample Rate sections for operation
DESCRIPTION
PD Rev 4.1 December 2007
Normal Mode
96/88.2kHz
0 = 256fs
1 = 128fs
1 = 384fs
1 = 192fs
Production Data
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