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TDA7266 Datasheet(PDF) 3 Page - STMicroelectronics |
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TDA7266 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 9 page 1 2 4 Vref ST-BY 7 IN1 C1 0.22 µF VCC 13 3 D95AU258A + - - + OUT1+ OUT1- 15 14 12 MUTE 6 IN2 C3 0.22 µF + - - + OUT2+ OUT2- 8 9 S-GND PW-GND C5 470 µF C6 100nF R1 10K C2 10 µF µP R2 10K C4 1 µF Figure 1: Microprocessor Application ELECTRICAL CHARACTERISTICS (Continued) Symbol Parameter Test Condition Min. Typ. Max. Unit VTST-BY St-by Threshold 0.8 1.3 1.8 V IST-BY ST-BY current V6 = GND 100 µA eN Total Output Noise Voltage A curve f = 20Hz to 20kHz 150 µV APPLICATION SUGGESTION STAND-BY AND MUTE FUNCTIONS (A) Microprocessor Application In order to avoid annoying "Pop-Noise" during Turn-On/Off transients, it is necessary to guaran- tee the right St-by and mute signals sequence. It is quite simple to obtain this function using a mi- croprocessor (Fig. 1 and 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 mantain 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. TDA7266 3/9 |
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