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TEA7532DP Folha de dados(PDF) 7 Page - STMicroelectronics |
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TEA7532DP Folha de dados(HTML) 7 Page - STMicroelectronics |
7 / 16 page Amplifier dc supply. In transmission mode, the supply voltage is control- led by the internal shunt DC regulator. For this rea- son, the TEA7532 should be supplied from a current source (see : supply considerations). An antidistortion system is embodied which pro- vides AGC control to avoid loudspeaker distortion under current-limited conditions. Figure 13. Circuit action. When the supply voltage is insufficient, the voltage at pin 1, falls below the reference voltage 1.1 V, re- sulting in transistor (TR) being switched off, resulting in zero current flow in resistor R. This state enables the gain control system. Under these conditions, the shunt DC supply will switch at a rate determined by the time constant of the RC network on pin 3. This switching action accomodates normal speech characteristics under low supply conditions. 1.2. ANTIACOUSTIC FEED-BACK SYSTEM (AN- TILARSEN SYSTEM) The purpose of this system is to control AGC action in order to avoid acoustic feed-back between the loudspeaker and the microphone, when used in a telephone set. Figure 14 . TEA7532 7/16 |
Nº de peça semelhante - TEA7532DP |
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Descrição semelhante - TEA7532DP |
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