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TDA7386 数据表(PDF) 11 Page - STMicroelectronics |
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TDA7386 数据表(HTML) 11 Page - STMicroelectronics |
11 / 14 page TDA7386 Application hints 11/14 3 Application hints Referred to the circuit of Figure 3. 3.1 SVR Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF time sequence and, consequently, plays an essential role in the pop optimization during ON/OFF transients. To conveniently serve both needs, ITS MINIMUM RECOMMENDED VALUE IS 10 μF. 3.2 Input stage The TDA7386’s inputs are ground-compatible and can stand very high input signals (±8Vpk) without any performances degradation. If the standard value for the input capacitors (0.1 μF) is adopted, the low frequency cut-off will amount to 16 Hz. 3.3 Stand-by and muting Stand-by and muting facilities are both CMOS-compatible. If unused, a straight connection to Vs of their respective pins would be admissible. Conventional/low-power transistors can be employed to drive muting and stand-by pins in absence of true CMOS ports or microprocessors. R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises. Since a DC current of about 10 μA normally flows out of pin 22, the maximum allowable muting-series resistance (R2) is 70KΩ, which is sufficiently high to permit a muting capacitor reasonably small (about 1 μF). If R2 is higher than recommended, the involved risk will be that the voltage at pin 22 may rise to above the 1.5 V threshold voltage and the device will consequently fail to turn OFF when the mute line is brought down. About the stand-by, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5V/ms. |
类似零件编号 - TDA7386 |
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类似说明 - TDA7386 |
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