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参数资料
| 型号： | TA2123AFG |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.006 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封装： | 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48 |
| 文件页数： | 4/20页 |
| 文件大小： | 430K |
| 代理商： | TA2123AFG |
TA2123AFG
2004-12-01
12
(4) Treble boost
The EQ terminal is synchronizes with the BST SW, and the input impedance is changed.
BST OFF: 100k (typ.)
BST ON: 1.9k (typ.)
The voltage gain increase 6 dB (typ.) at high frequency range in case that the capacitor CX is connected
between the EQ terminal and the PW NF terminal.
Fig.6
Treble boost
(5) Cross talk of output coupling type
In case of output coupling mode, the cross talk is determined by resistor RL and capacitor C which are
connected with power amplifier output as shown in Fig.7.
The formula is shown below.
G (ω) = 1 / 2 [1 + jωC (RL / 2)]
CT = 20og|Gv| = 20og [1 / 2 [
2
)
0
/
(
1
ω
+
]], ω0 = 1 / C (RL / 2)
At f = 1kHz, C1 = 220F, RL = 32, The cross talk becomes about 33 dB.
Fig.7
Cross talk of output coupling type
PW IN
PW NF
EQ
C
X
PWA / B
+
28
29
30
PWA
PWC
PWB
R2
RL
+
C
+
C
R
LR
L
VREF
~
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