參數(shù)資料
型號: TS4990IQT
廠商: STMICROELECTRONICS
元件分類: 音頻/視頻放大
英文描述: 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8
封裝: 3 X 3 MM, LEAD FREE, DFN-8
文件頁數(shù): 16/32頁
文件大小: 714K
代理商: TS4990IQT
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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