wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 46

• Manufacturer Part Number: wm9714l
• Description: Ac?97 Audio Codec
• Manufacturer: Wolfson Microelectronics plc

WM9714L
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SINGLE MIC OPERATION
Up to three microphones can be connected in a single-ended configuration. Any one of the three
MICs can be selected as the input to MPA using MPASEL[1:0] (Register 22h, bits 13:12). Only the
microphone on MIC2B can be selected to MPB. Note that MPABST always sets the gain for the
selected MPA input microphone. If MIC2B is the selected input for MPA it is recommended that MPB
is disabled.
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.
Figure 21 Dual Microphone Configuration
PP, Rev 3.2, October 2008
Pre-Production
46