Functional Description

When CE active low, the HT82V733 need rising time to output fully on OUTP pin. However, the rising time depends on

C1. (*see the application circuits)

Capacitor

Voltage

0.1

mF1mF

4.7

mF10mF

2.2V

15ms

30ms

90ms

185ms

3V

15ms

30ms

90ms

185ms

4V

15ms

30ms

90ms

185ms

For battery based applications, power consumption is a key issue, therefore the amplifier should be turned off when in

the standby state. In order to eliminate any speaker sound bursts while turning the amplifier on, the application circuit,

which will incorporate a capacitance value of C1, should be adjusted in accordance with the speaker s audio frequency

response. A greater value of C1 will improve the noise burst while turning on the amplifier. The recommended opera-

tion sequence is:

Turn On: audio1 signal standby (1/2 VDD)

Turn Off: audio1 signal finished

If the application is not powered by batteries and there is no problem with amplifier On/Off issue, a capacitor value of

0.1uF for C1 is recommended.

Application Circuits

HT82V733

Rev. 1.10

3

January 6, 2003

1

2

3

4

5

6

7

8

H T 8 2 V 7 3 3

4 7 m .

0 . 1 m .

1 m .

C E

S p e a k e r

O U T N

V D D

V R E .

A u d i o I n

C 1

C 2

C 3

A u d i o I n

R

C E

O U T P

A u d i o 1

E N

O U T