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TDA7053AT Datasheet(PDF) 4 Page - NXP Semiconductors |
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TDA7053AT Datasheet(HTML) 4 Page - NXP Semiconductors |
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4 / 16 page  1997 Jul 15 4 Philips Semiconductors Product specification Stereo BTL audio output amplifier with DC volume control TDA7053A PINNING SYMBOL PIN DESCRIPTION n.c. 1 not connected VC1 2 DC volume control 1 n.c. 3 not connected VI (1) 4 voltage input 1 VP 5 positive supply voltage VI (2) 6 voltage input 2 SGND 7 signal ground VC2 8 DC volume control 2 OUT2+ 9 positive output 2 PGND2 10 power ground 2 n.c. 11 not connected OUT2 − 12 negative output 2 OUT1 − 13 negative output 1 PGND1 14 power ground 1 n.c. 15 not connected OUT1+ 16 positive output 1 Fig.2 Pin configuration. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VC1 n.c. VP I (1) V I (2) V SGND VC2 OUT1 PGND1 PGND2 OUT1 OUT2 OUT2 n.c. TDA7053A TDA7053AT n.c. n.c. MSA719 - 2 FUNCTIONAL DESCRIPTION The TDA7053A and TDA7053AT are stereo output amplifiers with two DC volume control stages, designed for TV and monitors, but also suitable for battery-fed portable recorders and radios. In conventional DC volume control circuits the control or input stage is AC coupled to the output stage via external capacitors to keep the offset voltage low. The two DC volume control stages are integrated into the input stages so that no coupling capacitors are required and a low offset voltage is still maintained. The minimum supply voltage also remains low. The BTL principle offers the following advantages: • Lower peak value of the supply current • The frequency of the ripple on the supply voltage is twice the signal frequency. Consequently, a reduced power supply with smaller capacitors can be used which results in cost reductions. For portable applications there is a trend to decrease the supply voltage, resulting in a reduction of output power at conventional output stages. Using the BTL principle increases the output power. The maximum gain of the amplifier is fixed at 40.5 dB. The DC volume control stages have a logarithmic control characteristic. Therefore, the total gain can be controlled from +40.5 to −33 dB. If the DC volume control voltage falls below 0.4 V, the device will switch to the mute mode. The amplifier is short-circuit protected to ground, VP and across the load. A thermal protection circuit is also implemented. If the crystal temperature rises above 150 °C the gain will be reduced, thereby reducing the output power. Special attention is given to switch-on and switch-off clicks, low HF radiation and a good overall stability. |
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