WM8983GEFL/RV Wolfson Microelectronics, WM8983GEFL/RV Datasheet - Page 39

• Manufacturer Part Number: WM8983GEFL/RV
• Description: Audio CODECs Mbl Multimedia CODEC w/ 1W Speaker Driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8983GEFL/RV

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C

Production Data
ANALOGUE TO DIGITAL CONVERTER (ADC)
Figure 22 ADC Digital Filter Path
w
Figure 21 Microphone Bias Schematic
ADC DIGITAL FILTERS
Table 13 ADC Enable Control
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 1.0V
Any voltage greater than full scale may overload the ADC and cause distortion.
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.
The ADCs are enabled by the ADCENL/R register bit.
R2
Power
management 2
REGISTER
ADDRESS
VMID
0
1
BIT
ADCENL
ADCENR
LABEL
internal
resistor
internal
resistor
0
0
DEFAULT
AGND1
MICBEN
Enable ADC left channel:
0 = ADC disabled
1 = ADC enabled
Enable ADC right channel:
0 = ADC disabled
1 = ADC enabled
DESCRIPTION
PD Rev 4.0 November 2006
MBVSEL=0
MICBIAS
= 1.8 x VMID
= 0.9 X AVDD1
MBVSEL=1
MICBIAS
= 1.3 x VMID
= 0.65 X AVDD1
WM8983
rms
39
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