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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(yè)數(shù)： | 8/33頁(yè) |
| 文件大小： | 948K |
| 代理商： | FAB2200UCX |
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2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAB2200 Rev. 1.0.1
16
FAB2200
—
Audio
Subsystem
with
St
ereo
Class-G
Headph
on
eAmplifier
Table 9.
THMAX Threshold
THMAX
[3:0]
Maximum
Output
Threshold
(Vpk)
Maximum Power with
Sine Wave and 8
Load (mW)
THMAX
[3:0]
Maximum
Output
Threshold
(Vpk)
Maximum Power
with Sine Wave and
8
Load (mW)
0000
THMAX Threshold Disabled
1000
3.6
810.0
0001
2.2
302.5
1001
3.8
902.5
0010
2.4
360.0
1010
4.0
1000.0
0011
2.6
422.5
1011
4.2
1102.5
0100
2.8
490.0
1100
4.4
1210.0
0101
3.0
562.5
1101
4.6
1322.5
0110
3.2
640.0
1110
4.8
1440.0
0111
3.4
722.5
1111
5.0
1562.5
THVBATT limits the amount of clipping allowed by the
AGC. As VBATT falls, the maximum output amplitude
falls. THVBATT defines the threshold as a fraction of the
VBATT supply voltage. When the fraction is less than 1,
the AGC attempts to adjust gain to prevent clipping. For
values greater than 1, some clipping is allowed before
the AGC reduces gain (see Table 10).
Table 10. THVBATT Threshold
THVBATT [4:0]
VBATT Fraction
(V/V)
THD with 1KHz
Sine Wave (%)
(VBATT=3.7V,
8
Load)
THVBATT [4:0]
VBATT Fraction
(V/V)
THD with 1KHz
Sine Wave (%)
(VBATT=3.7V,
8
Load)
0000
THVBATT Threshold Disabled
1000
1.25
13.0
0001
0.90
1.0
1001
1.30
14.4
0010
0.95
3.0
1010
1.35
15.6
0011
1.00
4.9
1011
1.40
16.7
0100
1.05
6.7
1100
1.45
17.7
0101
1.10
8.5
1101
1.50
18.7
0110
1.15
10.0
1110
1.55
19.6
0111
1.20
11.6
1111
1.60
20.5
Ultimately, the AGC threshold is whichever voltage is
lower between THVBATT and THMAX. For example, if
THMAX = 0111, THVBATT = 0001, and VBATT = 4.2V,
the AGC threshold is 3.4V as defined by THMAX. If
VBATT falls to 3.6V, the AGC threshold falls to 3.24V as
defined by THVBATT (see Figure 21). If THVBATT and
THMAX are both set to 0, the AGC is disabled.
Figure 21. AGC Threshold, THMAX = 0111,
THVBATT = 0001
2.5
3.5
4.5
2 .533 .5
4
4 .555 .5
V BATT (V)
A
G
C
Thr
e
s
h
o
ld
(V
)
TH M A X
2.0
2.5
3.0
3.5
4.0
4.5
5.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
A
G
C
Thr
e
s
h
o
ld
(V
)
TH M A X
TH
VB
AT
T
A G C Threshold
AG
C
Th
re
sh
old
V
BAT
T
=4
.2
V
BAT
T
=3
.6
V
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