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TDA7057AQ Scheda tecnica(PDF) 4 Page - NXP Semiconductors |
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TDA7057AQ Scheda tecnica(HTML) 4 Page - NXP Semiconductors |
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4 / 16 page  1998 Apr 07 4 Philips Semiconductors Product specification 2 × 8 W stereo BTL audio output amplifier with DC volume control TDA7057AQ PINNING SYMBOL PIN DESCRIPTION VC1 1 DC volume control 1 n.c. 2 not connected Vl (1) 3 voltage input 1 VP 4 positive supply voltage Vl (2) 5 voltage input 2 SGND 6 signal ground VC2 7 DC volume control 2 OUT2+ 8 positive output 2 PGND2 9 power ground 2 OUT2 − 10 negative output 2 OUT1 − 11 negative output 1 PGND1 12 power ground 1 OUT1 + 13 positive output 1 Fig.2 Pin configuration. handbook, halfpage 1 2 3 4 5 6 7 8 9 10 11 12 13 TDA7057AQ VC1 n.c. VP I (1) V I (2) V SGND VC2 OUT2 PGND2 OUT2 OUT1 OUT1 PGND1 MSA716 FUNCTIONAL DESCRIPTION The TDA7057AQ is a stereo output amplifier with two DC volume control stages. The device is designed for TVs and monitors, but is 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. In the TDA7057AQ 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 dB 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 a 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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