WM9712CLGEFLSLASHV datasheet(16/78 Pages) WOLFSON

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WM9712L

Production Data

PD, Rev 4.6, November 2011

It is also possible to use the LINEINL and LINEINR pins as a second differential microphone input.

This is achieved by setting the DS bit (register 5Ch, bit 11) to ‘1’. This disables the line-in audio paths

and routes the signal from LINEINL and LINEINR through the differential mic path, as if it came from

the MIC1 and MIC2 pins. Only one differential microphone be used at a time. The DS bit only has an

effect when MS = 01 (differential mode).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0Eh

Mic Volume

M12P

Mute MIC1 path to phone mixer

1: Mute, 0: No mute (ON)

M22P

Mute MIC2 path to phone mixer

1: Mute, 0: No mute (ON)

12:8

LMICVOL

01000

(0dB)

Left microphone volume

Only used when MS = 11

Similar to MICVOL

20dB

Microphone gain boost (Note 1)

1: 20dB boost ON

0: No boost (0dB gain)

6:5

Microphone mode select

Single-ended mono (left)

left = right = MIC1 (pin 21)

Volume controlled by MICVOL

Differential mono mode

left = right = MIC1 – MIC2

Volume controlled by MICVOL

Single-ended mono (right)

left = right = MIC2 (pin 22)

Volume controlled by MICVOL

Stereo mode

MIC1 = left, MIC2 = right

Left Volume controlled by LMICVOL

Right volume controlled by MICVOL

4:0

MICVOL

01000

(0dB)

Microphone volume to mixers

00000: +12dB

… (1.5dB steps)

11111: -34.5dB

5Ch

Additional

Analogue

Functions

Differential Microphone Select

0 : Use MIC1 and MIC2

1: Use LINEL and LINER (Note 2)

Table 3 Microphone Input Control

Note:

The 20dB gain boost acts on the input to the phone mixer only. A separate microphone

boost for recording can be enabled using the BOOST bit in register 1Ah.

When the LINEL and LINER are selected for differential microphone select then the

MIC1 and MIC2 input pins become disabled, these signals can therefore not be routed

internally to the device.

MICROPHONE BIAS

The MICBIAS output (pin 28) provides a low noise reference voltage suitable for biasing electret type

microphones and the associated external resistor biasing network. The internal MICBIAS circuitry is

shown below. Note that the maximum source current capability for MICBIAS is 3mA. The external

biasing resistors and microphone cartridge therefore must limit the MICBIAS current to 3mA.

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