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參數(shù)資料
| 型號： | TA2123AFG |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.006 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封裝： | 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 430K |
| 代理商： | TA2123AFG |
TA2123AFG
2004-12-01
9
2. Power amplifier stage
(1) Input of power amplifier
Each input signal should be applied through a capacitor. In case that DC current or DC voltage is applied
to each amplifier, the internal circuit has unbalance and the each amplifier doesn’t operate normally.
It is advised that input signal refer to VREF voltage, in order to reduce a pop noise or low frequency leak.
(2) Output application
This IC can chose the output coupling type and OCL type. The CAMP SW should be connected to GND
in case that the output coupling type is chosen. The supply current decreases when not using the bass
boost function.
(3) Bass boost function
(a) System
This IC has the bass boost function in power amplifier stage. After this system adds the low frequency
ingredient of side amplifier, it is applied into the center amplifier. And the bass boost level is controlled
by the variable impedance circuit (Fig.3)
Flow of the bass boost signal
Variable impedance circuit→Boost amplifier→Center amplifier
Flow of the bass boost level
Output of center amplifier→AGC DET (level detection) →
Variable impedance circuit operation
The system of treble boost function is realized by frequency characteristic adjustment of the side
amplifier.
Fig.3
Bass boost system
Ra
C1
C6
+
Flow of the bass boost signal
AGC
DET
ATT
BST
Rc
R1 C2
C5 Rb
C3
Rd
C4
PWB
PWA
PWC
R
L
R
L
Flow of the Bass boost level
27
28
31
36
35
34
33
32
20
21
22
+
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