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HT82V739 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc |
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HT82V739 Datasheet(HTML) 3 Page - Holtek Semiconductor Inc |
3 / 10 page 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) Capacitor tR 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: 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 If the application is not powered by batteries and there is no problem with amplifier On/Off issue, a capacitor value of 0.1 mF for C1 is recommended. HT82V739 Rev. 1.20 3 January 17, 2008 t R C E O U T P t R t R A u d I n O U T C E |
Similar Part No. - HT82V739_08 |
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Similar Description - HT82V739_08 |
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