ht82v733 Holtek Semiconductor Inc., ht82v733 Datasheet - Page 3

• Manufacturer Part Number: ht82v733
• Description: Ht82v733 -- 400mw Mono Audio Power Amp
• Manufacturer: Holtek Semiconductor Inc.

Functional Description
OUTP Rising Time (t
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)
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
0.1uF for C1 is recommended.
Application Circuits
Rev. 1.10
If the application is not powered by batteries and there is no problem with amplifier On/Off issue, a capacitor value of
Voltage
2.2V
3V
4V
t
R
Capacitor
R
)
0.1mF
15ms
15ms
15ms
disable amplifier
enable amplifier
wait t
30ms
30ms
30ms
1mF
3
R
for amplifier off
wait t
R
for amplifier ready
4.7mF
90ms
90ms
90ms
audio1 signal off
audio1 output
HT82V733
January 6, 2003
185ms
185ms
185ms
10mF