WM8593 datasheet(33/98 Pages) WOLFSON

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WM8593

PP Rev 1.0 January 2007

Figure 17 illustrates the various blocks of the analogue routing paths within the WM8593. The

following sections describe the control bits associated with the WM8593 analogue paths. Figure 17

also shows where these control bits take affect on the WM8593.

Figure 17 Analogue Routing Paths and Control

ANALOGUE VOLUME CONTROL

Each analogue bypass channel includes analogue volume control. Volume changes can be applied

to each channel immediately as they are written. Alternatively, all volume changes can be written,

and then all volume changes can be applied simultaneously using the volume update feature.

Volume control includes optional zero cross functionality. When zero cross is enabled, volume

changes are not applied until the output level crosses the DC level of the analogue channel (VMID).

Zero cross helps to prevent pop and click noise when changing volume settings.

The zero cross function includes a timeout which forces volume changes if a zero cross event does

not occur. The timeout period is a maximum of 278ms.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R19

PGA1L_VOL

13h

7:0

PGA1L_

VOL[7:0]

R20

PGA1R_VOL

14h

7:0

PGA1R_

VOL[7:0]

R21

PGA2L_VOL

15h

7:0

PGA2L_

VOL[7:0]

R22

PGA2R_VOL

16h

7:0

PGA2R_

VOL[7:0]

00001100

Input PGA Volume

0000 0000 = +6dB

0000 0001 = +5.5dB

…0.5dB steps

00001100 = 0dB

…

1001 1110 = -73.5dB

1001 1111 = PGA Mute

WM8593 Datasheet(PDF) 33 Page - Wolfson Microelectronics plc

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