TA8266HQ 데이터 시트보기 (PDF) - Toshiba
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TA8266HQ Datasheet PDF : 16 Pages
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TA8266HQ
Large current capacity switch
BATTERY
VCC
VCC
– Conventional Method –
RELAY
BATTERY
FROM
MICROCOMPUTER
Small current capacity switch
BATTERY
DIRECTLY FROM
MICROCOMPUTER
Stand-By VCC
Stand-By VCC
– Stand-by Switch Method –
BATTERY
Figure 3
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 kΩ to get enough muting attenuation.
The muting function have to be controlled by a transistor, FET and micro-controller port which has
IMUTE > 250 µA 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 micro-controller 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.
<Recommended Application>
I (100 µA)
IMUTE (OFF) 22
R1
A
IMUTE
VMUTE
ATT – VMUTE
20
10 kΩ
5 kΩ
0
−20
−40
<Application for pulled up>
I (100 µA)
IMUTE (OFF) 22
R1
IMUTE
VMUTE
−60
−80
−100
0
0.4 0.8 1 1.2 1.6
VCC = 13.2 V
Po = 10 W
PL = 4 Ω
f = 1 kHz
2
2.4 2.8 3
Point A voltage: VMUTE (V)
Figure 4 Muting Function
Figure 5 Mute Attenuation − VMUTE (V)
4
2006-04-28
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