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2 x 25 mW class-G stereo headphone driver with I2C-bus volume control
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The SA58635 is a stereo, class-G headphone driver with I²C-bus volume control. The I²C-bus control allows maximum flexibility with digital volume control, independent channel enable and mute control.
The output of the SA58635 is referenced around true ground zero. It is designed to operate at the low supply current of 1.5 mA making it battery friendly. A power management technique provides class-G power efficiency by using a buck converter to step down the battery supply from a typical lithium ion battery (4.8 V to 2.3 V). Efficiency is further increased by allowing the output amplifier/driver to operate at multiple voltage rails based on the output/input swing.
The SA58635 delivers 2 × 25 mW minimum into 16 Ω and 32 Ω loads. The SA58635 provides thermal shutdown and self limiting current protection.
The SA58635 is a high fidelity HP driver amplifier with a S/N of 100 dB minimum. An excellent PSRR of more than 100 dB, differential input circuit topology allows for maximum noise immunity in the noisy mobile phone environment.
The SA58635 is available in a 16-bump WLCSP (Wafer Level Chip-Size Package) making it ideal choice for cellular handsets and portable media players.
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