WM8595 datasheet(34/82 Pages) WOLFSON

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WM8595

Production Data

PD, Rev 4.2, January 2011

Note: When ATTACK_BYPASS=1 or DECAY_BYPASS=1, it is recommended that the zero cross

function for the PGA is used to eliminate click noise when changing volume settings.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R25

PGA_CTRL1

19h

DECAY_

BYPASS

PGA Gain Decay Mode

0 = PGA gain will ramp down

1 = PGA gain will step down

ATTACK_

BYPASS

PGA Gain Attack Mode

0 = PGA gain will ramp up

1 = PGA gain will step up

R27

ADD_CTRL1

1Bh

6:4

PGA_

SR[2:0]

001

Sample Rate for PGA

000 = 32kHz

001 = 44.1kHz

010 = 48kHz

011 = 88.2kHz

100 = 96kHz

101 = 176.4kHz

11X = 192kHz

See Table 23 for further information on PGA

sample rate versus volume ramp rate.

R36

PGA_CTRL3

24h

3:1

PGA_

SEL[2:0]

000

PGA Ramp Control Clock Source

000 = LRCLK1

001 = LRCLK2

010 to 110 = Reserved

111 = ADCLRCLK (when ADC is being used

in master mode)

PGA_UPD

PGA Ramp Control Clock Source Mux

Update

0 = Do not update PGA clock source

1 = Update clock source

Table 24 Analogue Volume Ramp Control

WM8595 Datasheet(PDF) 34 Page - Wolfson Microelectronics plc

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