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參數(shù)資料
| 型號： | TA2160FNG |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.012 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO30 |
| 封裝： | 0.300 INCH, 0.65 MM PITCH, PLASTIC, SSOP-30 |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TA2160FNG |
TA2160FNG
2004-05-11
7
(b)
AGC circuit
The AGC circuit of bass boost function is realized by the variable impedance circuit. The AGC
DET circuit detects the low frequency level of center amplifier. When this level becomes high,
the variable impedance circuit operates, and this circuit attenuates the input level of center
amplifier.
The AGC DET circuit is the current input, so that the output voltage of ADD amplifier is
changed into the current ingredient by resistor Rb and capacitor C5 which are shown in Figure
2. And it is smoothed and detected by DET circuit (pin 14). And the direct current should not be
applied to the AGC IN circuit, because, as for the circuit, the sensitivity setup is high.
Moreover, the AGC signal level is decreased in case that the resistor R5 is connected with the
capacitor C5 in series. And the AGC point can be changed. But the center amplifier is clipped in
the low frequency in case that the resistor R5 is larger.
(c)
Bass boost
The signal flow of bass boost function is as follows, refer to Figure 3.
LPF (internal resistors 2R1 and external capacitor C1)
→ ATT (variable impedance circuit)
→ HPF (BST amplifier)
→ BPF (LPF: internal resistor R4 and external capacitor C3, HPF: external capacitor C4
and internal resistor R5)
→ Center amplifier
The center amplifier signal becomes the reverse phase, because the phase of audio frequency
range is reversed with two LPFs.
18
PWA
PWB
PWC
R
L
R
L
19
17
BST
22
23
C4
21
Rd
Rc
C2
C3
C5
Rb
Flow of the bass boost level
20
AGC
DET
ATT
14
C6
C1
24
Ra
Flow of the bass boost signal
11
8
R1
Figure 2
Bass Boost System
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