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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)： | 24/31頁(yè) |
| 文件大小： | 577K |
| 代理商： | AN12942B |
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24
SDC00047AEB
AN12942B
Note
Design reference value
Parameter
Equal to or more than 32
of loads
Ability of the output drive
Note) *: The time of the warp (to 5th of THD) of
1% of output.
2.4 dBV
Maximum output level
Note) *: The time of the warp (to 5th of THD) of
1% of output.
3.0 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 1
Output impedance
Note) *: It done the change being of
±
10%
because there is a change of the inner
resistance.
22.5 k
Input impedance
Note) *: At EVR is maximum.
+
6.0 dB
The input/output gain
Design reference value
Application Notes (continued)
2.
Headphone amplifier circuit block
(continued)
Beep signal I/O
R1
IN1
6.75k
34
R2
R3
IN2
IN3
V
REF
+
Comparator
Headphone amplifier
Speaker amplifier
Input amplifier
Since input amplifier is of a reverse amplifier system, any input to pin 34 through a resistor from some circuits would not cause any
drop of input impedance.
Gain of in 1
6.75 k
Gain of in 2
Gain
=
20 log
R1
Gain
=
20 log
R2
6.75 k
Threshold level of comparator is 0.1 Vrms to 0.4 Vrms.
Therefore, keep output of input amplifier equal to or more than 0.4 Vrms.
Equal to or more than 0.4 Vrms ensures that a certain level of beep sound is output to the speaker.
Beep I/O level characteristics : Speaker load - 8
Beep frequency level characteristics : Speaker load - 8
S
0.001
10
1
0.1
0.01
10
1
0.1
Beep input level (Pin 34) (Vrms)
V
CC
=
5 V
V
CC_
SP
=
5 V
Beep
→
L-out, R-out
f
req
=
1 kHz
Input resistance
=
15 k
Square wave
EVR = 3 V(max)
AGC
:
Off
Autimatic detection on
1
2
1.5
1
10
0.1
100
S
Beep input frequency (Pin 34) (kHz)
V
CC
=
5 V
V
CC_
SP
=
5 V
Beep
→
L-out, R-out
V
IN
=
1.5 Vrms
Input resistance
=
15 k
Square wave
EVR = 3 V(max)
AGC
:
Off
Autimatic detection on
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