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WM8952ECS/RV 데이터시트(PDF) 22 Page - Wolfson Microelectronics plc

부품명 WM8952ECS/RV
상세설명  Mono ADC with Microphone Pre-amplifier
PDF  72 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
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WM8952
Pre Production
w
PP, Rev 3.1, June 2011
22
ANALOGUE TO DIGITAL CONVERTER (ADC)
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 1.0Vrms.
Any voltage greater than full scale may overload the ADC and cause distortion.
ADC DIGITAL FILTERS
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.
Figure 10 ADC Digital Filter Path
The ADC is enabled by the ADCEN register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R2
Power
management 2
0
ADCEN
0
0 = ADC disabled
1 = ADC enabled
Table 11 ADC Enable
The polarity of the output signal can also be changed under software control using the ADCPOL
register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R14
ADC Control
0
ADCPOL
0
0=normal
1=inverted
Table 12 ADC Polarity



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