PA3212L 查看數據表（PDF） - Unisonic Technologies
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产品描述 (功能)
生产厂家
PA3212L
Unisonic Technologies
PA3212L Datasheet PDF : 9 Pages
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PA3212
APPLICATION INFORMATION
Shutdown Mode Operating
HP/ LINE
X
L
L
H
H
X: Don’t care
L: Low
H: High
INPUT
SE/ BTL
X
L
H
L
H
SHUTDOWN
L
H
H
H
H
CMOS IC
AMPLIFIER
INPUT
X
LINE
LINE
HEADPHONE
HEADPHONE
OUTPUT
MUTE
BTL
SE
BTL
SE
CI (Input Capacitor)
The value of CI is important to consider as it directly affects the bass performance of the application circuit. When CI is
required to allow the amplifier to bias the input signal to the proper dc level for optimum operation, it’s value can be
calculate by this equation:
CI=1/(2πRIFC)
RI: Input Impedance
FC: High-pass Filter’s Frequency
The low leakage tantalum or ceramic capacitors are suggested to be used as the input coupling capacitors, because
of the small leakage current of the input capacitors will cause the dc offset voltage at the input to the amplifier that
reduces the operation headroom, especially at the high gain applications. It is important to let the positive side
connecting to the higher dc level of the application when using the polarized capacitors.
Gain setting (VS Gain0, Gain1 and RI)
Gain setting is determined by GAIN0 and GAIN1. The gains listed in the next table are realized by changing the taps
on the input resistors inside the amplifier which will cause the internal input impedance(R I) to be dependent on the
gain setting as we can see listed in the next table.
GAIN0
0
0
1
1
X
GAIN1
0
1
0
1
X
R I(kΩ)
91
45.5
26
14
AV(V/V)
2
6
12
24
1
SE/ BTL
0
0
0
0
1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 9
QW-R502-310.A
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