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WM8976 데이터시트(PDF) 29 Page - Wolfson Microelectronics plc

부품명 WM8976
상세설명  Low Power CODEC With Speaker Driver
PDF  83 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8976 데이터시트(HTML) 29 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM8976
w
PTD Rev 2.0 February 2005
29
Figure 13 Microphone Bias Schematic
ANALOGUE TO DIGITAL CONVERTER (ADC)
The WM8976 uses a multi-bit, oversampled sigma-delta ADC. 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 for each ADC channel is illustrated in Figure 14.
Figure 14 ADC Digital Filter Path
The ADC is enabled by the ADCENL register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R2
Power
management 2
0
ADCENL
0
Enable ADC:
0 = ADC disabled
1 = ADC enabled
Table 13 ADC Enable Control
AGND
MBVSEL=0
MICBIAS
= 1.8 x VMID
= 0.9 X AVDD
VMID
internal
resistor
internal
resistor
MB
MBVSEL=1
MICBIAS
= 1.2 x VMID
= 0.6 X AVDD



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