wm8952 Wolfson Microelectronics plc, wm8952 Datasheet - Page 20

• Manufacturer Part Number: wm8952
• Description: Mono Adc With Microphone Pre-amplifier
• Manufacturer: Wolfson Microelectronics plc

WM8952
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The internal MICBIAS circuitry is shown in Figure 9.
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
VMID
internal
resistor
internal
resistor
AGND
Note that the maximum source current
MB
PP, Rev 3.0, December 2008
MBVSEL=0
MICBIAS
= 1.8 x VMID
= 0.9 X AVDD
MBVSEL=1
MICBIAS
= 1.3 x VMID
= 0.65 X AVDD
Pre Production
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