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參數(shù)資料
| 型號(hào)： | TSDC05IJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | LEAD FREE, FCP-9 |
| 文件頁(yè)數(shù)： | 16/32頁(yè) |
| 文件大小： | 714K |
| 代理商： | TSDC05IJT |
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TS4990
Application information
23/32
Figure 64.
Differential input amplifier configuration
The input capacitor Cin can be calculated by the following formula using the -3 dB lower
frequency required. (FL is the lower frequency required).
Note:
This formula is true only if:
is 5 times lower than FL.
Example bill of materials
The bill of materials in Table 7 is for the example of a differential amplifier with a gain of 2
and a -3 dB lower cut-off frequency of about 80 Hz.
R2
R1
Neg. Input
Vcc
Cin
+
Cs
+
Cb
Standby
Control
Speaker
8Ohms
Bias
AV = -1
Vin-
Vin+
Bypass
Standby
VC
C
GN
D
Vout 1
Vout 2
+
-
+
-
TS4990
R1
Pos. Input
Cin
R2
C
in
1
2
πR
1FL
---------------------
(F)
≈
F
CB
1
2
π R
1
R
2
+
()C
B
----------------------------------------
(Hz)
=
Table 7.
Bill of materials for differential input amplifier application
Pin name
Functional description
R1
20k / 1%
R2
20k / 1%
Cin
100nF
Cb=Cs
1F
U1
TS4990
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