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參數(shù)資料
| 型號： | AN12942B |
| 廠商： | PANASONIC CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Audio signal processing IC for notebook PC |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO56 |
| 封裝： | 0.300 INCH, PLASTIC, HSOP-56 |
| 文件頁數(shù)： | 22/31頁 |
| 文件大?。?/td> | 577K |
| 代理商： | AN12942B |
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22
SDC00047AEB
AN12942B
Application Notes
1.
Linear amplifier circuit block
Following block diagrams is line amplifier circuit.
1) The gain of the linear amplifier system is
+
0.83 dB.
2) To become a connection of the standing in the row, the entry impedance of pin 28, pin 27 becomes 22.5 k
.
It stores up that these pins also serve as the headphone entry (the impedance
=
45 k
).
3) It is possible to adjust to the direction which lowers a gain in adding resistance to pin 28, pin 27.
But, the gain of the headphone system, too, changes at the same time.
Pin 28
Pin 27
If external resistance is “R”
4) By the mute control by pin 31, the line can be output in the mute.
5) For the pop sound measure at the time of power on, delay from the standby cancellation by pin 32 and cancel a linear mute.
(Refer to sheet no.2 for circuit constant.)
Equal to or more than 10 k
of loads
Ability of the output drive
Note) *: The time of the warp (to 5th of THD) of
1% of output.
3.0 dBV
Maximum output level
Note) *: The time of the warp (to 5th of THD) of
1% of output.
1.6 dBV
Maximum input level
Note) *: But, it limits into the sound band range
of equal to or less than 50 kHz
.
Equal to or less than 10
Output impedance
Note) *: It done the change being of
±
10%
because there is a change of the inner
resistance.
22.5 k
Input impedance
+
0.83 dB
The input/output gain
Note
Design reference value
Parameter
Design reference value
29
28
13.1k
31.9k
Line
mute
+
3.83 dB
30
27
13.1k
Headphone amplifier input terminal
(Input impedance
=
45 k
)
3 dB
+
3.83 dB
31
Line output
R-channel
Line mute control
Line output
L-channel
Line input
L-channel
Line input
R-channel
3 dB
31.9k
Gain
=
20 log
R
+
13.1 k
+
31.9 k
31.9 k
13.1k
31.9k
+
3.83 dB
R
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