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WM8983 Datasheet(PDF) 39 Page - Cirrus Logic

No. de pieza WM8983
Descripción Electrónicos  Mobile Multimedia CODEC with 1W Speaker Driver
PDF  129 Pages
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Fabricante Electrónico  CIRRUS [Cirrus Logic]
Página de inicio  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8983 Datasheet(HTML) 39 Page - Cirrus Logic

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WM8983
Rev 4.6
39
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 10 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*AVDD1 and when MBVSEL=1,
MICBIAS=0.65*AVDD1. 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 11 Microphone Bias Enable Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R44
Input control
8
MBVSEL
0
Microphone Bias Voltage Control
0 = 0.9 * AVDD1
1 = 0.65 * AVDD1
Table 12 Microphone Bias Voltage Control
The internal MICBIAS circuitry is shown in Figure 21.
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 21 Microphone Bias Schematic
AGND1
MBVSEL=0
MICBIA
SS
= 1.8 x VMID
= 0.9 X AVDD1
VMI
D
internal
resistor
internal
resistor
MICBE
N
MBVSEL=1
MICBIA
S
= 1.3 x VMID
= 0.65 X AVDD1



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