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WM8960 データシート(PDF) 24 Page - Wolfson Microelectronics plc

部品番号 WM8960
部品情報  Stereo CODEC with 1W Stereo Class D Speaker Drivers and Headphone Drivers for Portable Audio Applications
PDF  92 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8960 データシート(HTML) 24 Page - Wolfson Microelectronics plc

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WM8960
Production Data
w
PD, August 2013, Rev 4.2
24
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
MBSEL
register
bit.
When
MBSEL=0,
MICBIAS=0.9*AVDD
and
when MBSEL=1,
MICBIAS=0.65*AVDD. The output can be enabled or disabled using the MICB control bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R25 (19h)
Power
management (1)
1
MICB
0
Microphone Bias Enable
0 = OFF (high impedance output)
1 = ON
R48 (30h)
Additional Control
(4)
0
MBSEL
0
Microphone Bias Voltage Control
0 = 0.9 * AVDD
1 = 0.65 * AVDD
Table 7 Microphone Bias Control
The internal MICBIAS circuitry is shown in Figure 9. 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 9 Microphone Bias Schematic



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