BU26156RFS Datasheet, PDF (29/95 Pages) Rohm – Monoraul MIC Input with ALC

BU26156RFS
Datasheet
Fast Release
In case of input impulse waveform is over target level of ALC, fast release function detects impulse waveform and LSI is
returned until normal waveform level quickly. As result of quick return, output waveform of LSI is kept natural sound.
Inpulse waveform
4
3
2
1
Input waveform
0
0
10
20
-1
30
40
50
60
70
80
90
10 0
11 0
1 20
-2
-3
-4
Waveform is low level
Output waveform
<Not use fast release>
Attack
Not use fast release
Output waveform
<Use fast release>
Quick return from low level waveform
Return to normal release
Release time of fast release
Attack
Figure 32. Not Fast release waveform and Fast release waveform
PALCFREN bit is setted enable of fast release function. When impulse waveform is over threshold of PALCFRTH level, fast
release function is started and is returned waveform until detected level by fast release decay time. This decay time is
selected PALFRSP bit.
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TSZ02201-0V1V0E502570-1-2
Jul.1.2014 Rev.001