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TPA0212 Datasheet(PDF) 31 Page - Texas Instruments |
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TPA0212 Datasheet(HTML) 31 Page - Texas Instruments |
31 / 33 page TPA0212 STEREO 2-W AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL SLOS284 – NOVEMBER 1999 31 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION PC BEEP operation The PC BEEP input allows a system beep to be sent directly from a computer through the amplifier to the speakers with few external components. The input is activated automatically. When the PC BEEP input is active, both of the LINEIN and HPIN inputs are deselected and both the left and right channels are driven in BTL mode with the signal from PC BEEP. The gain from the PC BEEP input to the speakers is fixed at 0.3 V/V and is independent of the volume setting. When the PC BEEP input is deselected, the amplifier will return to the previous operating mode and volume setting. Furthermore, if the amplifier is in shutdown mode, activating PC BEEP will take the device out of shutdown and output the PC BEEP signal, then return the amplifier to shutdown mode. The preferred input signal is a square wave or pulse train with an amplitude of 1 Vpp or greater. To be accurately detected, the signal must have a minimum of 1 Vpp amplitude, rise and fall times of less than 0.1 µs and a minimum of 8 rising edges. When the signal is no longer detected, the amplifier will return to its previous operating mode and volume setting. If it is desired to ac-couple the PC BEEP input, the value of the coupling capacitor should be chosen to satisfy equation 14: C PCB w 1 2 p ƒ PCB (100 k W) (14) The PC BEEP input can also be dc-coupled to avoid using this coupling capacitor. The pin normally sits at midrail when no signal is present. shutdown modes The TPA0212 employs a shutdown mode of operation designed to reduce supply current, IDD, to the absolute minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal should be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the outputs to mute and the amplifier to enter a low-current state, IDD = 150 µA. SHUTDOWN should never be left unconnected because amplifier operation would be unpredictable. Table 6. HP/LINE, SE/BTL, and Shutdown Functions INPUTS† AMPLIFIER STATE HP/LINE SE/BTL SHUTDOWN INPUT OUTPUT X X Low X Mute Low Low High Line BTL Low High High Line SE High Low High HP BTL High High High HP SE † Inputs should never be left unconnected. X = do not care |
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