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WM8985GEFL/R Datasheet(PDF) 38 Page - Wolfson Microelectronics plc

Part # WM8985GEFL/R
Description  Multimedia CODEC With Class D Headphone and Line Out
PDF  118 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8985GEFL/R Datasheet(HTML) 38 Page - Wolfson Microelectronics plc

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WM8985
Pre-Production
w
PP, Rev 3.4, October 2006
38
Figure 18 Microphone Bias Schematic
ANALOGUE TO DIGITAL CONVERTER (ADC)
The WM8985 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 19.
Figure 19 ADC Digital Filter Path
The ADCs are enabled by the ADCENL/R register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
ADCENL
0
Enable ADC left channel:
0 = ADC disabled
1 = ADC enabled
R2 (02h)
Power
management 2
1
ADCENR
0
Enable ADC right channel:
0 = ADC disabled
1 = ADC enabled
Table 13 ADC Enable Control



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