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AS3665
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n A u d i o I n p u t
Table 45. Audio_Control Register (Continued)
Addr: 1Ch
Audio_Control Register
Bit
Bit Name
Default Access
Description
Modifies the behavior for over/underflow with the
sequencer adder and subtract commands
1
audio_cmdset
0b
R/W
0
A over/underflow rolls over
at zero and full scale
1
The adder/subtract command saturate
1
Enable audio input buffer
2
audio_buf_on
0b
R/W
0
Off
any selection of adc_select possible
1
000
001
010
On
adc_select =0 (audio buffer) mandatory
Audio input buffer gain setting
-12dB
-6dB
0dB
5:3
audio_buf_gain
000b
R/W
011
+6dB
100
101
110
111
+12dB
+18dB
+24dB
+30dB
7:6
reserved
00b
R/W
reserved - always set to 00b
1. For audio processing always set audio_cmdset =1
AGC (Automatic Gain Control)
The AGC is used to ‘compress’ the input signal and to attenuate very low input amplitude signals (this is performed to
ensure no light output for low signals especially for noisy input signals).
The AGC monitors the input signal amplitude and filters this amplitude with a filter with a short attack time, but a long
decay time (decay time depends on the register agc_ctrl ). This amplitude measurement (represented by an integer
value from 0 to 15; the decay time of this measurement is controlled by agc_time ) is then used to amplify or attenuate
the input signal with one of the following amplification ratios (output to input ratio) – the curve A, B, or C is selected
depending on the register agc_ctrl :
Table 46. AGC gain curves
Input Amplitude
AGC gain
curve A
curve B
curve C
0
1
2
3
4
5
6
www.austriamicrosystems.com
0.0
7.5
7.0
4.5
3.5
3.0
2.5
Revision 1.0.2
0.0
5.0
4.0
3.5
3.0
2.5
2.5
0.0
3.5
3.0
2.5
2.0
1.5
1.5
35 - 77
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