HT82V739 データシートの表示（PDF） - Holtek Semiconductor
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HT82V739 Datasheet PDF : 10 Pages
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HT82V739
Functional Description
OUTP Rising Time (tR)
When CE is active low, the HT82V739 needs rising time to output fully on OUTP pin. However, the rising time depends
on C1. (*see the application circuits)
CE
O U TP
tR
Capacitor
tR
0.1mF
1mF
4.7mF
10mF
Voltage
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: ²Aud In² signal standby (1/2 VDD) ® enable amplifier ® wait tR for amplifier ready ® ²Aud In² signal start
Turn Off: ²Aud In² signal finish ® disable amplifier ® wait tR for amplifier off ® ²Aud In² signal off
A u d In
tR
tR
CE
OUT
If the application is not powered by batteries and there is no problem with amplifier On/Off issue, a capacitor value of
0.1mF for C1 is recommended.
Rev. 1.20
3
January 17, 2008
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