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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA8551 датащи(PDF) 4 Page - NXP Semiconductors |
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TDA8551 датащи(HTML) 4 Page - NXP Semiconductors |
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4 / 20 page  1998 Feb 23 4 Philips Semiconductors Product specification 1 W BTL audio amplifier with digital volume control TDA8551 FUNCTIONAL DESCRIPTION The TDA8551; TDA8551T is a 1 W BTL audio power amplifier capable of delivering 1 W output power to an 8 Ω load at THD = 10% using a 5 V power supply. The gain of the amplifier can be set by the digital volume control. In the maximum volume setting the gain is 20 dB. Using the MODE pin the device can be switched to the standby condition, the mute condition and the normal operating condition. The device is protected by an internal thermal shutdown protection mechanism. Power amplifier The power amplifier is a Bridge Tied Load (BTL) amplifier with a complementary CMOS output stage. The total voltage loss for both output power MOS transistors is within 1 V and with a 5 V supply and an 8 Ω loudspeaker an output power of 1 W can be delivered. The total gain of this power amplifier is internally fixed at 20 dB. Volume control The volume control operates as a digital controlled attenuator between the audio input pin and the power amplifier. In the maximum volume control setting the attenuation is 0 dB and in the minimum volume control setting the typical attenuation is 80 dB. The attenuation can be set in 64 steps by the UP/DOWN pin. This UP/DOWN pin is a trinary input: • Floating UP/DOWN pin: volume remains unchanged • Negative pulses: setting volume towards minimum • Positive pulses: setting volume towards maximum. Each pulse on the UP/DOWN pin results in a change in gain of 80/64 = 1.25 dB (typical value). In the basic application the UP/DOWN pin is switched to ground or VP by a double push-button. When the supply voltage is initially connected, after a complete removal of the supply, the initial state of the volume control is an attenuation of 40 dB (low volume), so the gain of the total amplifier is −20 dB. After powering-up, some positive pulses have to be applied to the UP/DOWN pin for turning up to listening volume. When the device is switched with the MODE select pin to the mute or the standby condition, the volume control attenuation setting remains on its value, assumed that the voltage on pin VP does not fall below the minimum supply voltage. After switching the device back to the operation mode, the previous volume setting is maintained. 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 VP and VP − 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 VP − 1.4 V the amplifier is in the mute condition. The mute condition is useful for using it as a ‘fast mute’; in this mode 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 done by holding the MODE pin at a level of 0.5VP, or by waiting approximately 100 ms before giving the first volume-UP pulses. |
Аналогичный номер детали - TDA8551 |
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Аналогичное описание - TDA8551 |
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