TA8264AHQ

2004-05-10

4

3.

By means of controlling pin 22 less than 0.5 V, it can make the audio muting condition.

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

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.

Small current capacity switch

BATTERY

Stand-By

DIRECTLY FROM

MICROCOMPUTER

BATTERY

Stand-By

– Stand-by Switch Method –

Figure 3

– Conventional Method –

Large current capacity switch

BATTERY

FROM

MICROCOMPUTER

BATTERY

RELAY

Figure 5

Mute Attenuation

Point A voltage: VMUTE (V)

10 k

Ω

5 k

Ω

VCC = 13.2 V

Po = 10 W

PL

= 4 Ω

f

= 1 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

I (100

µA)

22

A

<Recommended Application>

<Application for pulled up>

I (100

µA)

22