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WM8974GEFL/V 데이터시트(PDF) 19 Page - Wolfson Microelectronics plc

부품명 WM8974GEFL/V
상세설명  Mono CODEC with Speaker Driver
PDF  87 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8974GEFL/V 데이터시트(HTML) 19 Page - Wolfson Microelectronics plc

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Production Data
WM8974
w
PD Rev 4.2 March 2007
19
Figure 9 Microphone Bias Schematic
ANALOGUE TO DIGITAL CONVERTER (ADC)
The WM8974 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 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 8 ADC Enable
AGND
MBVSEL=0
MICBIAS
= 1.8 x VMID
= 0.9 X AVDD
VMID
internal
resistor
internal
resistor
MB
MBVSEL=1
MICBIAS
= 1.3 x VMID
= 0.65 X AVDD



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