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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 |
| 文件頁數(shù)： | 10/33頁 |
| 文件大?。?/td> | 948K |
| 代理商： | FAB2200UCX |
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2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAB2200 Rev. 1.0.1
18
FAB2200
—
Audio
Subsystem
with
St
ereo
Class-G
Headph
on
eAmplifier
AGC Attack
AGC attack occurs when the AGC determines that, after
applying present gain, the output signal amplitude would
be too high and gain should be stepped down by 1dB.
The AGC checks an approximation of the amplitude of
the output signal that includes present gain, but
excludes clipping that may occur in the final output
stage. All of the following conditions must be true to
trigger an AGC attack:
The amplitude is above the AGC threshold, AND
Present gain is above the minimum gain point, AND
Attack speed is not exceeded.
The minimum gain is determined by the AGCMIN
register. The rate of gain reduction is determined by the
AGCATTACK register.
AGC Release
When the output signal is below the AGC threshold,
gain is stepped up by 1dB. The rate of gain increase is
determined by the AGCRELEASE registers. Gain is
increased until it reaches the starting gain or an AGC
attack is triggered again.
Table 12. AGC Attack Speed
AGCATTACK [2:0] AGC Attack Speed (s/Step) AGCATTACK [2:0] AGC Attack Speed (s/Step)
000
12.5
100
200
001
25.0
101
400
010
50.0
110
800
011
100.0
111
1600
Table 13. AGC Release Speed
AGCRELEASE [2:0]
AGC Release Speed
(ms/Step)
AGCRELEASE [2:0]
AGC Release Speed
(ms/Step)
000
12.5
100
200
001
25.0
101
400
010
50.0
110
800
011
100.0
111
1600
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