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TDA8552T Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA8552T Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 28 page  1998 Jun 02 6 Philips Semiconductors Preliminary specification 2 × 1.4 W BTL audio amplifiers with digital volume control and headphone sensing TDA8552T; TDA8552TS FUNCTIONAL DESCRIPTION The TDA8552T is a 2 × 1.4 W BTL audio power amplifier capable of delivering 2 × 1.4 W output power into 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. The gain in the maximum volume setting is 20 dB (low gain) or 30 dB (high gain). This maximum gain can be selected by the gain selection pin. The headphone sense input (HPS) can be used to detect if a headphone is plugged into the jack connector. If a headphone is plugged into the jack connector the amplifier switches from the BTL to the SE mode and the BTL loudspeakers are switched off. This also results in a reduction of quiescent current consumption. Using the MODE pin the device can be switched to the standby condition, the mute condition or 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 1.4 W can be delivered. The total gain of this power amplifier can be set at 20 or 30 dB by the gain selection pin. Gain selection The gain selection can be used for a fixed gain setting, depending on the application. The gain selection pin must be hard wired to ground (20 dB) or to VDD (30 dB). Gain selecting during the operation is not advised, switching is not guaranteed plop free. Input attenuator The volume control operates as a digitally controlled input 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. Both attenuators for channels 1 and 2 are separated from each other and are controlled by there own UP/DOWN pin. Balance control can be arranged by applying UP/DOWN pulses only on pins 6 and 7, see Fig.5. Volume control Each attenuator is controlled with its own UP/DOWN pin (trinary input): • Floating UP/DOWN pin: volume remains unchanged • Negative pulses: decreasing volume • Positive pulses: increasing volume. Each pulse on the UP/DOWN pin results in a change in gain of (typical value). In the basic application the UP/DOWN pin is switched to ground or VDD 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 in the low gain setting or −10 dB in the high gain setting. After powering-up, some positive pulses have to be applied to the UP/DOWN pin for turning up to listening volume. Auto repeat If the UP/DOWN pin is LOW or HIGH for the wait time (twait in seconds) (one of the keys is pressed) then the device starts making up or down pulses by itself with a frequency given by (repeat function). The wait time and the repeat frequency are set using an internal RC oscillator with an accuracy of ±10%. Volume settings in standby mode When the device is switched with the MODE select pin to the mute or the standby condition, the volume control attenuation setting keeps its value, under the assumption that the voltage on the VDD pin does not fall below the minimum supply voltage. After switching the device back to the operation mode, the previous volume setting is maintained. In the standby mode the volume setting is maintained as long as the minimum supply voltage is available. The current consumption is very low, approximately 1 µA (typ.). In battery fed applications the volume setting can be maintained during battery exchange if there is a supply capacitor available. 80 64 ------ 1.25 dB = 1 t rep -------- |
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