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參數(shù)資料
| 型號(hào)： | 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)： | 14/17頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TA2160FNG |
TA2160FNG
2004-05-11
6
Application Note
1.
Preamplifier Stage
Output DC voltage of preamplifier
Output DC voltage of preamplifier is determined by external resistors R1 and R2 as shown in
Figure 1.
VO (PRE) = VREF V × (R2/R1 + 1)
VREF = 0.73 V (typ.)
VREF is changed when resistance is connected between RF OUT terminal and VREF IN terminal
(Refer to application note 3 (1)).
V is an offset voltage which is designed to 28.6 mV.
It is as follows in case that the DC voltage is calculated by the constant of a test circuit.
VO (PRE) = 0.73 V 28.6 mV (200 k/22 k + 1)
= 0.44 V
Output DC voltage of preamplifier should be fixed about VCC/2, because preamplifier get a enough
dynamic range.
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)
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 (Figure 2)
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.
VREF
R1
R2
V = 28.6 mV
Figure 1
Output DC Voltage of Preamplifier
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