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TDA8552T Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDA8552T Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 28 page 1998 Jun 02 7 Philips Semiconductors Preliminary specification 2 × 1.4 W BTL audio amplifiers with digital volume control and headphone sensing TDA8552T; TDA8552TS Mode select pin The device is in the standby mode (with a very low current consumption) if the voltage at the MODE pin is between VDD and VDD − 0.5 V. At a mode select voltage level of less than 0.5 V the amplifier is fully operational. In the range between 1 V and VDD − 1 V the amplifier is in the mute condition. The mute condition is useful for using it as a ‘fast mute’, in this mode the output signal is suppressed, while the volume setting remains at its value. It is advised to keep the device in the mute condition while the input capacitor is being charged. This can be achieved by holding the MODE pin at a level of 0.5VDD, or by waiting approximately 100 ms before giving the first volume-UP pulses. Headphone sense pin (HPS) A headphone can be connected to the amplifier by using a coupling capacitor for each channel. The common ground pin of the headphone is connected to the ground of the amplifier, see Fig.4. By using the HPS pin as illustrated in Fig.4, the TDA8552T detects if a headphone jack plug is inserted into the connector. When no headphone is plugged in, the voltage level at the HPS pin will remain LOW. A voltage less than VDD − 1V at the HPS pin will keep the device in the BTL mode, thus the loudspeakers can be operational. If the HPS pin is not connected then the device will remain in the BTL mode. When a headphone is plugged into the connector, the voltage at the HPS pin will be set to VDD. The device then switches to the Single-Ended (SE) mode, this means that the slave power amplifiers at the outputs OUT1 − and OUT2 − will be switched to the standby mode. This results in floating outputs OUT1 − and OUT2−, the loudspeaker signal is thus attenuated by approximately 80 dB and only the headphone can operate. One of the benefits of this system is that the loudspeaker current does not flow through the jack connector switch, which could give some output power loss. The other benefit is that the quiescent current is reduced when the headphone jack is inserted. |
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