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參數(shù)資料
| 型號： | TA2160FNG |
| 廠商： | Toshiba Corporation |
| 英文描述： | Low Consumption Current Stereo Headphone Amplifier (1.5/3 V use) |
| 中文描述： | 低功耗電流立體聲耳機放大器（1.5 / 3伏的使用） |
| 文件頁數(shù)： | 6/17頁 |
| 文件大小： | 278K |
| 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.
V
O
(PRE)
=
V
REF
V
×
(R2/R1
+
1)
V
REF
=
0.73 V (typ.)
V
REF is changed when
resistance is connected between RF OUT terminal and V
REF 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.
V
O
(PRE)
=
0.73 V
28.6 mV (200 k
/22 k
+
1)
=
0.44 V
Output DC voltage of preamplifier should be fixed about V
CC
/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 V
REF
voltage, in order to reduce a pop noise or low frequency
leak.
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.
(2)
V
REF
R1
R2
V
=
28.6 mV
Figure 1 Output DC Voltage of Preamplifier
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