ROHM launches coupling capacitor-less audio amplifier for headphones

ROHM Semiconductor has announced the development of the BD88415GUL, a coupling capacitor-less stereo headphone amplifier IC that is ideal for portable applications.

Conventional circuitry requires large coupling capacitors to improve frequency characteristics for bass. PSRR (power supply rejection ratio) was determined by midpoint bias circuit (1/2VDD) and therefore limited in low frequencies because of the CR characteristics.

The BD88415GUL integrates a charge pump circuit to generate PVSS. Bias level becomes 0V instead of 1/2VDD owing to the built-in generation of a negative power supply (PVSS). Utilization of both positive (PVDD) and negative (PVSS) power supplies to drive the headphone allows the removal of coupling capacitors. Moreover, PSRR is improved at low frequencies and pop noise at start-up is considerably reduced because of no DC bias voltage.

Click here to download the data sheet

BD88415GUL is housed in an ultra small CSP (2.1 x 2.1 x 0.55mm) package minimising mounting space.

For more information, or details on these items or the full range of ROHM products available from Anglia please call +44 (0)1945 474747 or email info@anglia.com

Alternatively, click on this link to go to the main Rohm section where you can view other news articles and product data.

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This news article was originally published in February 2010.