wm8952 Wolfson Microelectronics plc, wm8952 Datasheet - Page 21

• Manufacturer Part Number: wm8952
• Description: Mono Adc With Microphone Pre-amplifier
• Manufacturer: Wolfson Microelectronics plc

Pre Production
Figure 10 ADC Digital Filter Path
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ANALOGUE TO DIGITAL CONVERTER (ADC)
ADC DIGITAL FILTERS
Table 11 ADC Enable
Table 12 ADC Polarity
The WM8952 uses a multi-bit, oversampled sigma-delta ADC channel. The use of multi-bit feedback
and high oversampling rates reduces the effects of jitter and high frequency noise. The ADC Full
Scale input level is proportional to AVDD. With a 3.3V supply voltage, the full scale level is 1.0V
Any voltage greater than full scale may overload the ADC and cause distortion.
The ADC filters perform true 24 bit signal processing to convert the raw multi-bit oversampled data
from the ADC to the correct sampling frequency to be output on the digital audio interface. The
digital filter path is illustrated in Figure 10.
The ADC is enabled by the ADCEN register bit.
The polarity of the output signal can also be changed under software control using the ADCPOL
register bit.
R2
Power
management 2
R14
ADC Control
REGISTER
REGISTER
ADDRESS
ADDRESS
0
0
BIT
BIT
ADCEN
ADCPOL
LABEL
LABEL
0
DEFAULT
0
DEFAULT
0 = ADC disabled
1 = ADC enabled
1=inverted
0=normal
DESCRIPTION
PP, Rev 3.0, December 2008
DESCRIPTION
WM8952
rms
21
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