Amplifiers Aid Portable-Electronics Manufacturers

Texas Instruments' 3.2W per channel stereo Class-D amplifier and 3W mono Class-D amplifier will benefit designers of mobile phones, notebook PCs and portable DVD players. Both amplifiers include fast gain ramp Smartgain automatic gain control (AGC) and programmable dynamic-range compression (DRC). To achieve louder volume from the speaker without increasing the peak voltage, the TPA2028D1 and TPA2026D2 incorporate DRC to boost soft volumes automatically, allowing designers to compress the dynamic range of the audio to match the dynamic range of the speaker.

The devices are said to have higher output power than the leading competition, yielding louder volume. The TPA2028D1 drives 3W/channel into 4Ohms at 5V for 43 per cent higher output power, while the TPA2026D2 drives 3.2W/channel into 4Ohms at 5V for 52 per cent higher output power. A twofold reduction in the quiescent current extends battery life, while a tenfold reduction in offset voltage significantly lowers pop-noise for clearer audio.

Programmable Smartgain DRC with selectable compression ratios for up to 30dB gain enhances the loudness without increasing the peak voltage. The TPA2028D1 is available in a 1.63 x 1.63mm, 0.5mm pitch, nine-ball WCSP and the TPA2026D2 is available in a 2.2 x 2.2mm, 0.5mm pitch, 16-ball WCSP.

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