Datenblatt-Suchmaschine für elektronische Bauteile |
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TEA7530 Datenblatt(PDF) 6 Page - STMicroelectronics |
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TEA7530 Datenblatt(HTML) 6 Page - STMicroelectronics |
6 / 11 page Amplifier DC Supply In transmission mode, the supply voltage is con- trolled by the internal shunt DC regulator. For this reason, the TEA7530 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. AGC Circuit action When the supply VLS is insufficient, the voltage at pin 8, falls below the reference voltage 1.2V, re- sulting in transistor (TR) being switched off, re- sulting 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 2. This switching action accomodates normal speech characteristic under low supply condi- tions. The AGC will be switched ON when the level on Pin 2 is greater than a reference voltage of 0.4V. Supply Considerations a) Current MODE - Pin 8 is open (VLS =VLS1)or connected to ground with an external resistor (Rext) higher than 16K Ω. The typical value of VLS is : VLS = 1.2V 40.5K Ω+( 27K Ω⁄ ⁄ REXT ) ( 27KΩ ⁄⁄ REXT ) . The AGC section is working as described in the previous paragraph. b) Voltage MODE - Pin 8 is shorted or connected to GND with a resistor (REXT) lower than 16K Ω.In this condition the circuit must be supplied with a DC voltage of 3 to 5.5V. In this case the AGC section is permanently ON. Pin 2 must be shorted to GND (in voltage mode only) to avoid perma- nent attenuation of the signal at audio input PIN FUNCTIONS PIN 1: GND. PIN 2: AUTOMATIC GAIN CONTROL FILTER The antidistortion system response is adjusted by the R-C network on this pin. The AGC will be switched ON when the level on pin 2 is greater than a reference voltage of 0.4V, the RC-network charges (current source ON) or discharges (current source OFF) according to supply voltage. Figure 11 TEA7530 6/11 |
Ähnliche Teilenummer - TEA7530 |
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Ähnliche Beschreibung - TEA7530 |
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