AS3675 datasheet(64/81 Pages) AMSCO

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AS3675

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

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

1. Its safe to keep default value

2. Its safe to keep default value

Table 84. Audio output

Addr: 48h

Audio output

Audio Sync input control

Bit

Bit Name

Default Access

Description

2:0

aud_amplitude

000b

R/W

LED(s) output amplitude control (in percent of selected

output current)

000

6.25%

001

12.5%

010

25%

011

50%

100

75%

101

87.5%

110

93.75%

111

100%

Table 83. Audio input

Addr: 47h

Audio input

Audio Sync input control

Bit

Bit Name

Default Access

Description

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