WM8510GEDSSLASHRV datasheet(18/56 Pages) WOLFSON

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WM8510

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PP Rev 1.2 December 2004

The MICP path to the BOOST stage is controlled by the MICP2BOOSTVOL[2:0] register bits. When

MICP2BOOSTVOL=000 this input pin is completely disconnected from the BOOST stage. Settings

001 through to 111 control the gain in 3dB steps from -12dB to +6dB.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

MIC2_2BOOSTV

000

Controls the MIC2 amplifer to the

input boost stage:

000=Path disabled (disconnected)

001=-12dB gain through boost stage

010=-9dB gain through boost stage

…

111=+6dB gain through boost stage

R47

Input BOOST

control

6:4

MICP2BOOSTVOL

000

Controls the MICP pin to the input

boost stage (NB, when using this

path set MICPZIUNPPGA=0):

000=Path disabled (disconnected)

001=-12dB gain through boost stage

010=-9dB gain through boost stage

…

111=+6dB gain through boost stage

Table 4 Input BOOST Stage Control

The BOOST stage is enabled under control of the BOOSTEN register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

management

BOOSTEN

Input BOOST enable

0 = Boost stage OFF

1 = Boost stage ON

Table 5 Input BOOST Enable Control

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 the Applications

Information section for recommended external components. The MICBIAS voltage can be altered via

the MBVSEL register bit.

When MBVSEL=0, MICBIAS=0.9*AVDD and when MBVSEL=1,

MICBIAS=0.75*AVDD. The output can be enabled or disabled using the MICBEN control bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

management 1

MICBEN

Microphone Bias Enable

0 = OFF (high impedance output)

1 = ON

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R44

Input Control

MBVSEL

Microphone Bias Voltage Control

0 = 0.9 * AVDD

1 = 0.75 * AVDD

The internal MICBIAS circuitry is shown in Figure 9.

Note that the maximum source current

capability for MICBIAS is 3mA. The external biasing resistors therefore must be large enough to limit

the MICBIAS current to 3mA.

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