參數(shù)資料
型號(hào)： FAB2200UCX
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 音頻／視頻放大
英文描述： 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA25
封裝： 0.40 MM PITCH, WLCSP-25
文件頁(yè)數(shù)： 13/33頁(yè)
文件大?。?/td> 948K
代理商： FAB2200UCX
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAB2200 Rev. 1.0.1
20
FAB2200
—
Audio
Subsystem
with
St
ereo
Class-G
Headph
on
eAmplifier
Programmable Speaker Amplifier Noise Gate
The speaker noise gate automatically mutes the speaker
amplifier when its input amplitude is low to reduce noise
during inactivity. This function is not recommended for
music playback, but is effective for speech. The amplitude
is measured after input pre-amplifiers, but before the
speaker amplifier’s volume control. The speaker noise
gate’s threshold level is set by the SPNGTHRESH
register. The amplitude must be less than the speaker
noise gate threshold for a time determined by the
SPNGTIME register. When the speaker noise gate mutes
the speaker amplifier, the SPNGTRIP bit is set to 1.
If the input amplitude goes above the speaker noise
gate threshold, the speaker amplifier is un-muted and
the SPNGTRIP bit is set to 0. If the AGC is not enabled,
the speaker amplifier is returned to its former
PRESENTGAIN value. If the AGC is enabled,
AGCRELEASE
speed
determines
the
new
PRESENTGAIN value.
Table 14. Speaker Noise Gate Threshold Voltage
SPNGTHRESH [2:0]
Speaker Noise Gate Threshold (mVpk)
000
Speaker Noise Gate Disabled
001
2.8
010
5.7
011
11.3
100
22.6
101
45.3
110
90.5
111
181.0
Table 15. Speaker Noise Gate Timing
SPNGTIME [2:0]
Time (ms)
000
10
001
20
010
40
011
80
100
160
101
320
110
640
111
Reserved
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