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WM8976 데이터시트(PDF) 28 Page - Wolfson Microelectronics plc

부품명 WM8976
상세설명  Low Power CODEC With Speaker Driver
PDF  83 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8976 데이터시트(HTML) 28 Page - Wolfson Microelectronics plc

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WM8976
Preliminary Technical Data
w
PTD Rev 2.0 February 2005
28
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
2:0
AUXL2BOOSTVOL
000
Controls the auxilliary amplifer to
the input boost stage:
000=Path disabled (disconnected)
001=-12dB gain through boost
stage
010=-9dB gain through boost
stage
…
111=+6dB gain through boost
stage
R47
Input BOOST
control
6:4
L2_2BOOSTVOL
000
Controls the L2 pin to the input
boost stage:
000=Path disabled (disconnected)
001=-12dB gain through boost
stage
010=-9dB gain through boost
stage
…
111=+6dB gain through boost
stage
Table 9 Input BOOST Stage Control
The BOOST stage is enabled under control of the BOOSTENL 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
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*AVDD and when MBVSEL=1,
MICBIAS=0.6*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 11 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 = 0.6 * AVDD
Table 12 Microphone Bias Voltage Control
The internal MICBIAS circuitry is shown in Figure 13.
Note that the maximum source current
capability for MICBIAS is 3mA. The external biasing resistor therefore must be large enough to limit
the MICBIAS current to 3mA.



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