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TDA7266L-J15-A-T 데이터시트(PDF) 4 Page - Unisonic Technologies |
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TDA7266L-J15-A-T 데이터시트(HTML) 4 Page - Unisonic Technologies |
4 / 7 page TDA7266 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 4 of 7 www.unisonic.com.tw QW-R107-037,A APPLICATION SUGGESTION For Microprocessor Application In order to avoid annoying ”Pop-Noise” during Turn-On/Off transients, it is necessary to guarantee the right ST-BY and MUTE signals sequence. It is quite simple to obtain this function using a microprocessor (Fig 1 and Fig 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 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 maintain 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. C5 470µF C6 100nF Vcc 13 3 1 2 15 14 OUT2- OUT2+ OUT1- OUT1+ PW-GND MUTE IN2 ST-BY IN1 S-GND 7 4 9 12 6 8 C1 0.22µF R1 10k C2 10µF C3 0.22µF R2 10k C4 1µF µP TDA7266 Fig. 1 Microprocessor Application |
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