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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TDA7383 Fiches technique(PDF) 8 Page - STMicroelectronics |
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TDA7383 Fiches technique(HTML) 8 Page - STMicroelectronics |
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8 / 12 page  INPUT STAGE The TDA7383’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. STAND-BY AND MUTING STAND-BY and MUTING facilities are both CMOS-COMPATIBLE. If unused, a straight con- nection to Vs of their respective pins would be ad- missible. 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 uA normally flows out of pin 22, the maximum allowable muting-se- ries resistance (R2) is 70K Ω, 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 as- signed in order to obtain a virtually pop-free tran- sition has to be slower than 2.5V/ms. DIAGNOSTICS FACILITY The TDA7383 is equipped with a diagnostics cir- cuitry able to detect the following events: CLIPPING in the output stage OVERHEATING (THERMAL SHUT-DOWN proximity) OUTPUT MISCONNECTIONS (OUT-GND & OUT-Vs shorts) Diagnostics information is available across an open collector output located at pin 25 (fig. 12) through a current sinking whenever at least one of the above events is recognized. Among them, the CLIPPING DETECTOR acts in a way to output a signal as soon as one or more power transistors start being saturated. As a result, the clipping-related signal at pin 25 takes the form of pulses, which are perfectly syn- cronized with each single clipping event in the music program and reflect the same duration time (fig. 13). Applications making use of this facility usually operate a filtering/integration of the pulses train through passive R-C networks and realize a volume (or tone bass) stepping down in associa- tion with microprocessor-driven audioprocessors. The maximum load that pin 25 can sustain is 1K Ω. Due to its operating principles, the clipping detec- tor has to be viewed mainly as a power-depend- ent feature rather than frequency-dependent.This means that clipping state will be immediately sig- naled out whenever a fixed power level is reached, regardless of the audio frequency. In other words, this feature offers the means to counteract the extremely sound-damaging effects of clipping, caused by a sudden increase of odd order harmonics and appearance of serious inter- modulation phenomena. Another possible kind of distortion control could be the setting of a maximum allowable THD limit (e.g. 0.5 %) over the entire audio frequency range. Besides offering no practical advantages, this procedure cannot be much accurate, as the non-clipping distortion is likely to vary over fre- quency. In case of OVERHEATING, pin 25 will signal out the junction temperature proximity to the thermal shut-down threshold. This will typically start about 2 oC before the thermal shut-down threshold is VREF R Vpin 25 25 D95AU303A Figure 12: Diagnostics circuit. Figure 13: Clipping Detection Waveforms. TDA7383 8/12 |
Numéro de pièce similaire - TDA7383 |
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Description similaire - TDA7383 |
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