AS3676 datasheet(73/92 Pages) AMSCO

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AS3676

Datasheet - D e ta i l e d D e s c r i p t i o n

7:6

audio_speed_down

00b

R/W

Audio controlled LED persistence time (ramping down)

none

200ms

400ms

800ms

Table 111. Audio input

Addr: 47h

Audio input

Audio Sync input control

Bit

Bit Name

Default Access

Description

2:0

audio_gain

000b

R/W

Audio input buffer gain control

000

-12dB

001

-6dB

010

0dB

011

+6dB

100

+12dB

101

+18dB

110

+24dB

111

+30dB

5:3

agc_ctrl

000b

R/W

Audio input buffer AGC function controls AGC switching

threshold

000

AGC off

001

Attenuate low amplitude signals otherwise linear

response (to remove e.g. noise)

010

AGC curve A; slow decay of amplitude detection

011

AGC curve A; fast decay of amplitude detection

100

AGC curve B; slow decay of amplitude detection

101

AGC curve B; fast decay of amplitude detection

110

AGC curve C; slow decay of amplitude detection

111

AGC curve C; fast decay of amplitude detection

audio_man_start

R/W

Startup Control of audio input buffer (used to charge

optional external dc blocking capacitor)

automatic precharging 300us (if audio_dis_start = 0)

continuously precharging (if aud_buf_on = 1)

audio_dis_start

R/W

Disable Startup Control of audio input buffer (used to

charge optional external dc blocking capacitor)

precharging enabled

precharging disabled

Table 110. Audio Control

Addr: 46h

Audio Control

Audio Sync Mode control

Bit

Bit Name

Default Access

Description

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