STMelectronics, puts forth a stereo headphone amplifier IC that claims to deliver considerably higher efficiency when compared to the previous-generation mobile devices. With this amplifier IC, one can experience improved audio quality for a longer time without having to charge the battery ever-so-often.
The amplifier IC TS4621 offers better audio functions of a traditional analog amplifier and even helps save power by operating from lower supply voltage for majority of audio-signal levels. When the amplifier is connected to two supplies, it seldom draws power from the higher-voltage and does so only when peak audio powers are necessary. The Class G, TS4621 is one among the very few headphone amplifiers specifically aimed at portable applications.
The TS4621 abridges the system design by including features like an industry-standard I2C interface which permits digital volume control from -60dB to +4dB and an articulated switch on/off circuitry that helps get rid of the pop and click noise. The miniscule size of the chip, mere 1.65mm x 1.65mm, permits the chip to be arranged very close to the headphone connector for enhanced audio performance.
STMicroelectronics has earlier produced audio ICs for products like mobile phones, multimedia and mp3 players, game terminals and GPS devices. The TS4621 consumes four times less power as compared to the TS4601, a class AB amplifier. The less consumption is valuable for energy-responsive applications such as battery-enabled devices. Additionally, the TS4621 surmounts in important audio functions and delivers a brilliant music experience to users.
The TS4621 is implemented with a 0.006% THD+N at 1kHz , 100dB PSRR at 217Hz (high immunity to GSM signaling noise), 100dB SNR at 0dB gain, 0.6mA/channel quiescent current and 2.1mA/channel active current at 100microW audio output. The stereo headset amplifier is testing with lead customers at the given moment and will be accessible for production orders of over 1000 units at a cost of $0.90 from April 2010.