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WM8950GEFL/V 데이터시트(PDF) 17 Page - Wolfson Microelectronics plc

부품명 WM8950GEFL/V
상세설명  ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS
PDF  52 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8950GEFL/V 데이터시트(HTML) 17 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM8950
w
PTD Rev 2.1 June 2005
17
The BOOST stage is enabled under control of the BOOSTEN register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R2
Power
management 2
4
BOOSTEN
0
Input BOOST enable
0 = Boost stage OFF
1 = Boost stage ON
Table 5 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=0.75*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 6 Microphone Bias Enable
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R44
Input Control
8
MBVSEL
0
Microphone Bias Voltage Control
0 = 0.9 * AVDD
1 = 0.75 * AVDD
Table 7 Microphone Bias Voltage Control
The internal MICBIAS circuitry is shown in Figure 9.
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.
AGND
MBVSEL=0
MICBIAS
= 1.8 x VMID
= 0.9 X AVDD
VMID
internal
resistor
internal
resistor
MB
MBVSEL=1
MICBIAS
= 1.5 x VMID
= 0.75 X AVDD
Figure 9 Microphone Bias Schematic



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