WM8960 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'WM8960' PDF : 91 Pages View PDF
WM8960
Production Data
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
R25 (19h)
Power
management (1)
BIT LABEL
1
MICB
R48 (30h)
0
Additional Control
(4)
MBSEL
Table 7 Microphone Bias Control
DEFAULT
DESCRIPTION
0
Microphone Bias Enable
0 = OFF (high impedance output)
1 = ON
0
Microphone Bias Voltage Control
0 = 0.9 * AVDD
1 = 0.65 * AVDD
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
w
PD, August 2013, Rev 4.2
24
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