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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： | 18/20页 |
| 文件大小： | 430K |
| 代理商： | TA2123AFG |
TA2123AFG
2004-12-01
7
Application Note
1. Preamplifier stage
(1) Output DC voltage of preamplifier
Output DC voltage of preamplifier is determined
by external resistors R1 and R2 as shown in Fig.1.
VO (PRE) = VREF OUTV × (R2 / R1 + 1)
Fig.1
Output DC voltage of preamplifier
VREF OUT = 0.73V (typ.)
V is an offset voltage which is designed to 28.6mV.
It is as follows in case that the DC voltage is calculated by the constant of a test circuit.
VO (PRE) = 0.73V28.6mV (200k / 22k + 1)
=0.44V
Output DC voltage of preamplifier should be fixed about VCC / 2, because preamplifier get a enough
dynamic range.
(2) AMS (automatic music sensor) function
A block diagram is shown in Fig.2. This function can AMS (automatic music sensor) and BS (blank skip).
The comparator input level is higher than comparator sensitivity.
→Rectangle wave is outputted.
The comparator input level is lower than comparator sensitivity.
→High level is outputted.
The sensitivity changeover is determined by AMS switch (the comparator sensitivity doesn’t change.).
Automatic music sensor mode
The AMS SW is also turned on when the MT SW is turned on. And the comparator input level is
determined by external resistors (R4~R6) and capacitors (C3, C4) from mixer amplifier output
level.
The transfer function is as follows.
VO / Vi = R3 / [R1R2 / (R1 + R2)] × {jωC4R5R6 / [R4R5 + jω (C3R4R5 + C4R4R5 +
C4R4R6 + C4R5R6) ω2C3C4R4R5R6]}
+
⊿
V = 28.6mV
VREF OUT
R1
R2
+
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