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TDA8922BTH Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA8922BTH Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 32 page  9397 750 13357 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Preliminary data sheet Rev. 01 — 1 October 2004 6 of 32 Philips Semiconductors TDA8922B 2 × 50 W class-D power amplifier The amplifier system can be switched in three operating modes with pin MODE: • Standby mode; with a very low supply current • Mute mode; the amplifiers are operational; but the audio signal at the output is suppressed by disabling the VI-converter input stages • Operating mode; the amplifiers fully are operational with output signal. To ensure pop-noise free start-up the DC output offset voltage is applied gradually to the output between Mute mode and Operating mode. The bias current setting of the VI converters is related to the voltage on the MODE pin; in Mute mode the bias current setting of the VI converters is zero (VI converters disabled) and in Operating mode the bias current is at maximum. The time constant required to apply the DC output offset voltage gradually between mute and operating can be generated via an RC-network on the MODE pin. An example of a switching circuit for driving pin MODE is illustrated in Figure 4. If the capacitor C is left out of the application the voltage on the MODE pin will be applied with a much smaller time-constant, which might result in audible pop-noises during start-up (depending on DC output offset voltage and used loudspeaker). In order to fully charge the coupling capacitors at the inputs, the amplifier will remain automatically in the Mute mode before switching to the Operating mode. A complete overview of the start-up timing is given in Figure 5. Fig 4. Example of mode selection circuit. 001aab172 SGND MODE pin mute/on R C R +5 V standby/ mute |
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