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WM8983GEFL/V bảng dữ liệu(PDF) 39 Page - Wolfson Microelectronics plc

tên linh kiện WM8983GEFL/V
Giải thích chi tiết về linh kiện  Mobile Multimedia CODEC with 1W Speaker Driver
PDF  124 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8983GEFL/V bảng dữ liệu(HTML) 39 Page - Wolfson Microelectronics plc

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Production Data
WM8983
w
PD, Rev 4.3, May 2010
39
Figure 21 Microphone Bias Schematic
ANALOGUE TO DIGITAL CONVERTER (ADC)
The WM8983 uses stereo multi-bit, oversampled sigma-delta ADCs. 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 AVDD1. 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 22.
Figure 22 ADC Digital Filter Path
The ADCs are enabled by the ADCENL/R register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R2
Power
management 2
0
ADCENL
0
Enable ADC left channel:
0 = ADC disabled
1 = ADC enabled
1
ADCENR
0
Enable ADC right channel:
0 = ADC disabled
1 = ADC enabled
Table 13 ADC Enable Control
AGND1
MBVSEL=0
MICBIA
= 1.8 x VMID
= 0.9 X AVDD1
VMI
internal
resistor
internal
resistor
MICBE
MBVSEL=1
MICBIA
= 1.3 x VMID
= 0.65 X AVDD1



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