TA8263BH Просмотр технического описания (PDF) - Toshiba
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TA8263BH Datasheet PDF : 13 Pages
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TA8263BH
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 kW to get enough muting attenuation.
The muting function have to be controlled by a transistor, FET and microcontroller port which has
IMUTE > 250 mA 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.
<Recommended Application>
I (100 mA)
IMUTE (OFF) 22
R1
A
IMUTE
VMUTE
<Application for pulled up>
I (100 mA)
IMUTE (OFF) 22
R1
IMUTE
VMUTE
ATT – VMUTE
20
10 kW
5 kW
0
-20
-40
-60
-80
-100
0
VCC = 13.2 V
Po = 10 W
PL = 4 W
f = 1 kHz
0.4 0.8 1 1.2 1.6 2 2.4 2.8 3
Point A voltage: VMUTE (V)
Figure 4 Muting Function
Figure 5 Mute Attenuation - VMUTE (V)
4
2002-02-13
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