While reducing power consumption, extending battery life and music playback time, it provides superior audio enjoyment, which is a consumer demand for smart phones and MP3 players, but from the current majority of devices using Class D amplifiers, The sound quality is not satisfactory.
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Xin Benwei, business development engineer of TI's China Analog Devices Division, said that class AB and non-capacitor class AB amplifiers either reduce performance or consume too much power, which is not suitable for high-quality and low-power portable playback. The two 25 mW, Class G DirectPath stereo headphone amplifiers TPA6140A2 and TPA6141A2, which are designed to meet this demand, can adjust the supply voltage of the audio signal to minimize power consumption, thus greatly extending the music playback time of music phones and MP3 players. Both devices reduce power consumption by 30% and extend music playback time by 45% compared to ground-referenced Class AB devices, which increase music playback time compared to the best Class AB amplifiers on the market today. 20%.
These two new Class G amplifiers consume only 0.6 mA of quiescent current per channel while maintaining a total supply current of less than 5 mA, and consume 5 mW per channel at 32 Ω load, extending battery life life. At the same time, the device uses TI's DirectPath technology to eliminate large DC blocking capacitors at the amplifier output, giving designers more board space and providing better low-frequency, high-fidelity sound quality. “In the design of Class AB amplifiers, single-supply DACs and op amps generate a DC bias signal that requires capacitor isolation, while capacitors cause clicks and clicks and form a high-pass filter. DirectPath technology does not require Large DC isolation capacitors solve the problem of Class AB amplifiers," Shinbun said.
In addition to the above features, the new Class G amplifier also incorporates a click suppression circuit to eliminate 噼噗 interference noise. The TPA6140A2 has a variable gain range from -59 dB to +4 dB, which can be controlled by a 32-step I2C volume control. It is programmed to maximize design flexibility; the TPA6141A2 has fixed gain settings of 0 dB and +6 dB for customers who require less flexibility. In addition, the new device uses a separate SGND pin to reduce ground loop noise when connecting non-earphone accessories.
Shinbashi recommends that the TPA6140A2 or TPA6141A2 be combined with TI's low-power audio converters, speaker amplifiers, OMAP3 processors, and TMS320C550x and TMS320C540x devices to design a playback system that will enable low-power systems.
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