CDB4351 datasheet(32/41 Pages) CIRRUS

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CS4351

DS566PP2

6.5

Channel A Volume Control - Register 05h

Channel B Volume Control - Register 06h

6.5.1 DIGITAL VOLUME CONTROL (VOL7:0) BITS 7-0

Default = 00h (0 dB)

Function:

The Digital Volume Control registers allow independent control of the signal levels in 1/2 dB increments

from 0 to -127.5 dB. Volume settings are decoded as shown in Table 10. The volume changes are im-

plemented as dictated by the Soft and Zero Cross bits in the Power and Muting Control register.

The actual attenuation is determined by taking the decimal value of the volume register and multiplying

by 6.02/12.

6.6

Ramp and Filter Control - Register 07h

6.6.1 SOFT RAMP AND ZERO CROSS CONTROL (SZC1:0) BITS 7-6

Default = 10

Function:

Immediate Change

When Immediate Change is selected all level changes will take effect immediately in one step.

Zero Cross

Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will occur

on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a time-

out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal

654

VOL7

VOL6

VOL5

VOL4

VOL3

VOL2

VOL1

VOL0

000

Binary Code

Decimal Value

Volume Setting

00000000

0 dB

00000001

-0.5 dB

00000110

-3.0 dB

11111111

255

-127.5 dB

Table 10. Example Digital Volume Settings

654

SZC1

SZC0

RMP_UP

RMP_DN

Reserved

FILT_SEL

Reserved

011

SZC1 SZC0

Description

Immediate Change

Zero Cross

Soft Ramp

Soft Ramp on Zero Crossings

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