TDA7266 查看數據表（PDF） - STMicroelectronics

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TDA7266

7+7W DUAL BRIDGE AMPLIFIER

STMicroelectronics 

ELECTRICAL CHARACTERISTICS (Continued)

Symbol

VTST-BY

IST-BY

eN

Parameter

St-by Threshold

ST-BY current V6 = GND

Total Output Noise Voltage

Test Condition

A curve

f = 20Hz to 20kHz

TDA7266

Min. Typ. Max. Unit

0.8

1.3

1.8

V

100

µA

150

µV

APPLICATION SUGGESTION

STAND-BY AND MUTE FUNCTIONS

(A) Microprocessor Application

In order to avoid annoying "Pop-Noise" during

Turn-On/Off transients, it is necessary to guaran-

tee the right St-by and mute signals sequence.

It is quite simple to obtain this function using a mi-

croprocessor (Fig. 1 and 2).

At first St-by signal (from mP) goes high and the

voltage across the St-by terminal (Pin 7) starts to

increase exponentially. The external RC network

is intended to turn-on slowly the biasing circuits of

Figure 1: Microprocessor Application

the amplifier, this to avoid "POP" and "CLICK" on

the outputs.

When this voltage reaches the St-by threshold

level, the amplifier is switched-on and the external

capacitors in series to the input terminals (C3,

C5) start to charge.

It’s necessary to mantain the mute signal low until

the capacitors are fully charged, this to avoid that

the device goes in play mode causing a loud "Pop

Noise" on the speakers.

A delay of 100-200ms between St-by and mute

signals is suitable for a proper operation.

C1 0.22µF

4

IN1

ST-BY R1 10K

7

C2

10µF

VCC

3

13

C5

470µF

+

1 OUT1+

-

C6

100nF

µP

S-GND

9

C3 0.22µF

IN2

Vref

12

MUTE R2 10K

6

C4

1µF

-

2 OUT1-

+

+

15 OUT2+

-

PW-GND

8

-

14 OUT2-

+

D95AU258A

3/9

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