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WM8980CGEFL/V 数据表(PDF) 30 Page - Wolfson Microelectronics plc

部件名 WM8980CGEFL/V
功能描述  Stereo CODEC with Speaker Driver and Video Buffer
PDF  123 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8980CGEFL/V 数据表(HTML) 30 Page - Wolfson Microelectronics plc

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WM8980
Pre-Production
w
PP, Rev 3.8, May 2012
30
The BOOST stage is enabled under control of the BOOSTEN register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R2
Power
management
2
4
BOOSTENL
0
Left channel Input BOOST enable
0 = Boost stage OFF
1 = Boost stage ON
5
BOOSTENR
0
Right channel Input BOOST enable
0 = Boost stage OFF
1 = Boost stage ON
Table 9 Input BOOST Enable Control
MICROPHONE BIASING CIRCUIT
The MICBIAS output provides a low noise reference voltage suitable for biasing electret type
microphones and the associated external resistor biasing network. Refer to the Applications
Information section for recommended external components. The MICBIAS voltage can be altered via
the MBVSEL register bit. When MBVSEL=0, MICBIAS=0.9*AVDD and when MBVSEL=1,
MICBIAS=0.65*AVDD. The output can be enabled or disabled using the MICBEN control bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
Power
management 1
4
MICBEN
0
Microphone Bias Enable
0 = OFF (high impedance output)
1 = ON
Table 10 Microphone Bias Enable Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R44
Input control
8
MBVSEL
0
Microphone Bias Voltage Control
0 = 0.9 * AVDD
1 = 0.65 * AVDD
Table 11 Microphone Bias Voltage Control
The internal MICBIAS circuitry is shown in Figure 15. Note that the maximum source current
capability for MICBIAS is 3mA. The external biasing resistors therefore must be large enough to limit
the MICBIAS current to 3mA.
Figure 15 Microphone Bias Schematic



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