ACS32201 datasheet(10/65 Pages) IDT

10 / 65 page

IDT CONFIDENTIAL

V0.6 07/11

ACS32201

LOW-POWER, HIGH-FIDELITY, CLASS-D AMPLIFIER

3.2.

Volume Control

The signal volume can be controlled digitally, across a gain and attenuation range of -95.25dB to 0dB (0.375dB steps).

The level of attenuation is specified by an eight-bit code, ‘DACVOL_x’, where ‘x’ is L, or R. The value “00000000” indi-

cates mute; other values select the number of 0.375dB steps above -95.625dB for the volume level.

The Volume Update bits control the updating of volume control data; when a bit is written as ‘0’, the Left Volume control

associated with that bit is updated whenever the left volume register is written and the Right Volume control is updated

when ever the right volume register is written. When a bit is written as ‘1’, the left volume data is placed into an internal

holding register when the left volume register is written and both the left and right volumes are updated when the right

volume register is written. This enables a simultaneous left and right volume update

The output path may be muted automatically when a long string of zero data is received. The length of zeros is pro-

grammable and a detection flag indicates when a stream of zero data has been detected.

Bit

Label

Type

Default

Description

R10 (0Ah)

VUCTL

RSVD

Reserved

DACFade

1 = volume fades between old/new value

0 = volume/mute changes immediately

5:3

RSVD

Reserved for future use.

DACVOLU

0 = Left DAC volume updated immediately

1 = Left DAC volume held until right DAC volume

SPKVOLU

0 = Left speaker volume updated immediately

1 = Left speaker volume held until right speaker

volume register written.

RSVD

Reserved

Table 6. Volume Update Control Register

Bit

Label

Type

Default

Description

R33 (21h)

Gain Control

(GAINCTL)

zerodet_flag

1 = zero detect length exceeded.

RSVD

Reserved for future use.

5:4

zerodetlen

Enable mute if input consecutive zeros exceeds this

length. 0 = 512, 1 = 1k, 2 = 2k, 3 = 4k samples

RSVD

Reserved for future use.

auto_mute

1 = auto mute if detect long string of zeros on input

RSVD

Reserved for future use.

RSVD

Reserved for future use.

zerodet_flag

1 = zero detect length exceeded.

Table 7. Gain Control Register

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