STMicroelectronics recently announced its second-generation digital audio amplifiers with internal 24-bit DAC conversion. The FDA801 and FDA801B four-channel class-D components are intended to simplify system design and lower cost for car-radio suppliers. Offering 40% power savings compared to standard class-D amplifiers, the new FDA801 and FDA801B four-channel class-D amplifiers with digital input convert the digital audio source directly into high-quality, cabin-filling sound. The digital input gives immunity to GSM noise, improves sound quality, saves component costs, and simplifies system design.
STMicro’s new power amplifiers combine superior audio quality and increased energy efficiency, as well as the unique real-time measurement of speaker impedance via the Digital Impedance Meter (FDA801B). The amplifiers are rated with 115-dB signal-to-noise ratio (SNR) and 110-dB dynamic range. The simplified digital input eliminates external DAC and external decoupling capacitor. The built-in Digital Impedance Meter (DIM, in FDA801B) automatically recognizes the connected speaker’s magnitude and phase and communicates it by digital bus (I2C). The FDA801 and FDA801B are now available in the LQFP64 Exposed Pad Up package.