參數(shù)資料
型號(hào)： AN12942B
廠商： PANASONIC CORP
元件分類： 消費(fèi)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(yè)數(shù)： 23/31頁(yè)
文件大?。?/td> 577K
代理商： AN12942B
23
SDC00047AEB
AN12942B
1) The gain of the headphone amplifier system is
+
6.0 dB when EVR is maximum.
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 pin 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 line system, too, changes at the same time.
Pin 28
Pin 27
If external resistance is “R”
4) By the mute control by pin 37, the headphone can be output in the mute.
5) By the EVR control of pin 19, the gain of the headphone output can be variably done.
6) The entry of the beep circuit of pin 34 is a virtual grounding entry. Therefore, the external resistance is necessary.
7) For the pop sound measure at the time of power on, delay from the standby cancellation by pin 32 and cancel a headphone save
mute.
(Refer to sheet no.2 for circuit constant.)
8) When high impedance load is likely to be connected to headphone amplifier output, insert a resistor of 1
to 4.7 k
so as to
lower shock noise at power on or standby on/off.
36
28
45k
HP
mute
+
6 dB
(at EVR = Max)
EVR
+
39
Headphone amplifier input pin
(Input impedance
=
45 k
)
37
Headphone output
R-channel
Headphone mute control
Headphone power save control
Headphone input
L-channel
HP
save
22.5k
EVR
+
+
6 dB
HP
EVR
Beep
27
45k
Headphone input
R-channel
22.5k
34
6.75k
40L-channel
19 EVR control
6 dB
Beep input
+
6 dB
+
6 dB
6 dB
Application Notes (continued)
2.
Headphone amplifier circuit block
Following block diagrams is headphone amplifier circuit.
Pin 39
Pin 40
1k ~ 4.7k
Gain
=
20 log
R
+
45 k
22.5 k
45k
22.5k
R
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