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WM8904CGEFL/RV Datenblatt(PDF) 70 Page - Wolfson Microelectronics plc

Teilenummer WM8904CGEFL/RV
Bauteilbeschribung  Ultra Low Power CODEC for Portable Audio Applications
PDF  188 Pages
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Hersteller  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8904CGEFL/RV Datenblatt(HTML) 70 Page - Wolfson Microelectronics plc

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WM8904
Pre-Production
w
PP, Rev 3.3, September 2012
70
DAC SLOPING STOPBAND FILTER
Two DAC filter types are available, selected by the register bit DAC_SB_FILT. When operating at
sample rates <= 24kHz (eg. during voice communication) it is recommended that the sloping
stopband filter type is selected (DAC_SB_FILT=1) to reduce out-of-band noise which can be audible
at low DAC sample rates. See “Digital Filter Characteristics” for details of DAC filter characteristics.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R33 (21h)
DAC Digital 1
11
DAC_SB_FILT
0
Selects DAC filter characteristics
0 = Normal mode
1 = Sloping stopband mode
(recommended when fs
24kHz
Table 38 DAC Sloping Stopband Filter
DAC OVERSAMPLING RATIO (OSR)
The DAC oversampling rate is programmable to allow power consumption versus audio performance
trade-offs. The default oversampling rate is low for reduced power consumption; using the higher
OSR setting improves the DAC signal-to-noise performance.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R33 (21h)
DAC Digital 1
6
DAC_OSR128
0
DAC Oversample Rate Select
0 = Low power (normal OSR)
1 = High performance (double OSR)
Table 39 DAC Oversampling Control



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