STMicroelectronics introduced the TS4621, a new stereo headphone amplifier chip. Compared with the previous generation, the TS4621's energy efficiency has been greatly improved, allowing consumers to enjoy high-quality music while extending battery charging life. This article refers to the address: http:// The TS4621 features the audio performance of a traditional analog audio amplifier that uses a lower voltage power supply to handle most audio signal levels for energy savings. When two power supplies are connected, the current of the high voltage rail is only consumed when the maximum power level is required. Using the Class G power amplifier principle, the TS4621 is one of the first headphone amplifiers on the market for portable applications. The TS4621 simplifies system design with a rich set of features. The industry-standard I2C interface enables digital volume control from -60dB to +4dB, and the chip-integrated switching circuit eliminates blasting and click noise. The ultra-thin 1.65mm x 1.65mm chip scale package allows the chip to be mounted closest to the headphone connector for optimal audio performance. As ST's audio IC portfolio for mobile phones, multimedia and MP3 players, gaming terminals and GPS, the TS4621's quiescent current consumption is one-fourth that of the existing Class AB amplifier TS4601. This energy-saving feature is important for battery-powered energy-sensitive devices. At the same time, the TS4621 has excellent key performance parameters to provide an excellent listening experience for end users. Main features of TS4621: • 0.006% THD+N at 1kHz The TS4621 has begun to provide test samples to major customers and will begin accepting orders in April 2010.
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• At 217Hz, the power supply voltage rejection ratio is 100dB (the GSM signal has excellent noise immunity)
• Signal-to-noise ratio 100dB at 0dB gain
• Quiescent current 0.6mA per channel
• Operating current of 2.1mA per channel at 100μW audio output
August 24, 2024