WM8961GEFLSLASHV datasheet(24/116 Pages) WOLFSON

24 / 116 page

WM8961

Pre-Production

PP, August 2009, Rev 3.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1 (01h)

Right Channel

PGA

IPVU

Input PGA Volume Update

0 = Store RINVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (right = RINVOL, left =

intermediate latch)

RINMUTE

Right Input PGA Analogue Mute

1 = Enable Mute

0 = Disable Mute

Note: IPVU must be set to un-

mute.

RIZC

Right Input PGA Zero Cross

Detector. Requires separate

setting.

1 = Change gain on zero cross

only

0 = Change gain immediately

5:0

RINVOL

[5:0]

011111

( 0dB )

Right Input PGA Volume Control

111111 = +24dB

111110 = +23.25dB

. . 0.75dB steps down to

000000 = -23.25dB

R23 (17h)

Additional

control(1)

TOEN

Timeout Enable

0 = Timeout disabled

1 = Timeout enabled

R30 (1Eh)

Clocking 3

8:7

CLK_TO_DIV[1:0]

Timeout/slow clock divider setting

00 : 125Hz ( timeout = 8ms)

01 : 250Hz ( timeout = 4ms)

10 : 500Hz ( timeout = 2ms)

11 : 1kHz ( timeout = 1ms)

Table 6 Input PGA Volume Control

See "Volume Updates" section for a more detailed description of the volume update function, the zero

cross function and the timeout operation

INPUT BOOST STAGE

The output of the PGA volume control stage is fed to the boost stage input. The input boost amplifier

is a second order MFB active filter with selectable step gain. The boost stage provides the capability

of adding large step gains to the output of the PGA. The output of the boost stage feeds into the ADC.

To prevent large step outputs from the ADC, the boost gain should only be set during initial

configuration.

The boost stage can provide up to +29dB additional gain from the PGA output to the ADC input,

providing a total maximum available analogue gain of +53dB from microphone to ADC. Microphone

PGA to boost gain settings are shown in Table 7.

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