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参数资料
| 型号： | TA8276HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 23 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 9/14页 |
| 文件大小： | 255K |
| 代理商： | TA8276HQ |
TA8276HQ
2004-05-10
4
3.
Muting Function (pin 22)
By means of controlling pin 22 less than 0.5 V, it can make the audio muting condition.
The muting time constant is decided by R1 and C4 and these parts is related the pop noise at power
ON/OFF.
The series resistance; R1 must be set up less than 10 k
to get enough muting attenuation.
The muting function have to be controlled by a transistor, FET and
-COM port which has IMUTE > 250 A
ability.
Pin 22 terminal voltage has the temperature characteristics of 4.6 V (low temperature) to 3.2 V (high
temperature).
Therefore, it is need to design with attention as using the microcontroller of which operating voltage is less
than 5 V.
Terminal 22 may not be pulled up and shall be controlled by OPEN/LOW.
When it is obliged to do, it must be pulled up via diode, because it has to defend flowing reverse current to
internal circuit of pin 22.
– Conventional Method –
VCC
Large current capacity switch
BATTERY
VCC
FROM
MICROCOMPUTER
BATTERY
RELAY
VCC
Small current capacity switch
BATTERY
Stand-By
VCC
DIRECTLY FROM
MICROCOMPUTER
BATTERY
Stand-By
– Stand-by Switch Method –
Figure 3
Figure 5
Mute Attenuation
VMUTE (V)
Point A voltage: VMUTE (V)
ATT – VMUTE
Mute
a
ttenua
tion
ATT
(dB
)
10 k
5 k
VCC = 13.2 V
Po = 10 W
PL
= 4
f
= 1 kHz
BW
= 400~30 kHz
100
0
0.4
0.8 1 1.2
1.6
2
2.4
2.8 3
80
60
40
20
0
20
Figure 4
Muting Function
R1
I (100
A)
22
IMUTE
IMUTE (OFF)
A
VMUTE
C
4
<Recommended Application>
<Application for pulled up>
R1
I (100
A)
22
IMUTE
IMUTE (OFF)
VMUTE
C
4
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