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WM8960GEFL/V Fiches technique(PDF) 23 Page - Wolfson Microelectronics plc

No de pièce WM8960GEFL/V
Description  Stereo CODEC with 1W Stereo Class D Speaker Drivers and Headphone Drivers for Portable Audio Applications
PDF  88 Pages
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Fabricant  WOLFSON [Wolfson Microelectronics plc]
Site Internet  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8960GEFL/V Fiches technique(HTML) 23 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM8960
w
PTD, September 2006, Rev 2.0
23
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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