WM8352 datasheet(67/336 Pages) WOLFSON

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Production Data

WM8352

PD, February 2011, Rev 4.4

13.4.5

MICROPHONE BIASING

The WM8352 provides a programmable, low-noise bias voltage for condenser electret microphones

on the MICBIAS pin.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R8 (08h)

Power Mgmt 1

MICB_ENA

Microphone bias enable

0 = OFF (high impedance output)

1 = ON

R74 (4Ah)

Mic Bias

Control

MICB_ENA

MICB_SEL

Microphone bias voltage control:

0 = 0.9 * AVDD

1 = 0.75 * AVDD

Note: MICB_ENA can be accessed through R8 or through R74. Reading from or writing to either

Table 23 Controlling the Microphone Bias Voltage

13.4.6

AUXILIARY INPUTS (IN3L AND IN3R)

The WM8352 provides two additional analogue input pins, IN3L and IN3R, for line-level audio or

“beep” signals. Each pin has a simple input buffer whose output signal can be digitised in the audio

ADC and/or mixed into the output signal path. The Right input IN3R may also be connected to the

Output Beep Mixer, for output on OUT2R (see Table 43). The input buffers have a nominal default

gain of -1 (0dB).

IN3L

20k

IN3L_SHORT, R73[6]

20k

Vmid

IN3R

20k

IN3R_SHORT, R73[14]

20k

Vmid

To:

Left Input Mixer,

Left Output Mixer

To:

Right Input Mixer,

Right Output Mixer,

Output Beep Mixer

Figure 38 Auxiliary Input Buffers

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