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WM9714CLGEFL/V bảng dữ liệu(PDF) 46 Page - Cirrus Logic

tên linh kiện WM9714CLGEFL/V
Giải thích chi tiết về linh kiện  AC??7 Audio Codec
PDF  120 Pages
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nhà sản xuất  CIRRUS [Cirrus Logic]
Trang chủ  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM9714CLGEFL/V bảng dữ liệu(HTML) 46 Page - Cirrus Logic

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WM9714L
46
Rev 4.0
DUAL MIC OPERATION
Up to two microphones can be connected in a dual differential configuration. This is suitable for stereo
microphone or noise cancellation applications. Mic1 is connected between the MIC2A and MICCM
inputs and mic2 is connected between the MIC2B and MICCM inputs as shown in Figure 21.
Additionally, another microphone can be supported on MIC1 selected through the MPA input mux.
Note that the microphones can be connected in a single-ended configuration.
MICBIAS
Vmi
d
MICB
MIC2B
-
+
MPB
MPBEN
Vmi
d
MICA
MIC2A
-
+
MPA
MPAEN
Vmi
d
MICCM
-
+
R
R
WM9714L
R
MIC
1
MIC
2
Figure 21 Dual Microphone Configuration
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
“Applications Information”
for recommended external components. The MICBIAS voltage can be altered via MBVOL in register
22h. When MBVOL=0, MICBIAS=0.9*AVDD and when MBVOL=1, MICBIAS=0.75*AVDD.
The microphone bias is driven to a dedicated MICBIAS pin 28 and is enabled by MPOP1EN in
register 22h. It can also be configured to drive out on GPIO8 pin 12 enabled by MPOP2EN in register
22h.
When not in use the microphone bias can be powered down using the Powerdown register bit
MICBIAS (register 3Eh, bit 14).



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