Lowest-power Class G headphone amps improve music playback time by 20%

Lowest-power Class G headphone amps improve music playback time by 20%

Claimed by the company to reduced power consumption by 30% over Class AB parts, the 25-mW TPA6140A2/TPA6141A2 Class G DirectPath stereo headphone amplifiers consume only 0.6-mA/channel quiescent current and deliver 5 mW/channel into a 32-Ω load, while keeping the total supply current below 5 mA to extend battery life. The company also claims a 20% improvement of system-level music playback time over today’s music phones based on Class AB technology.

Features include built-in pop suppression circuitry, differential inputs, a PSRR of greater than 100 dB, and a SNR of 100 dB. With its Directpath technology, the parts eliminate the need for large dc-blocking capacitors at the output. The TPA6140A2 provides a variable gain range of −59 to 4 dB programmable via a 32-step I2 C volume control, while the TPA6141A2 offers two fixed-gain settings of 0 and 6 dB for customers who require less flexibility. (TPA6140A2, $0.95 ea/1,000 — available now.)

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