Lowering both power and noise are essential in the fast-moving, highly competitive market for consumer and portable devices,” said Jae-Hong Oh, senior product marketing manager at Nuvoton. “Our engineers, therefore, spearheaded an intensive effort to define a new generation of Class-D amplifiers – the NAU82039 – designed to address the market’s need for power consumption and reduced switching noise, while delivering an array of other experience-enriching features.”
The NAU82039 mono Class-D audio amplifier sets a new standard in audio amplifiers by offering an ultra-low quiescent current (1.25mA at 3.6V) for output power delivered, allowing the device unparalleled for the portable applications where battery life represents a significant differentiating factor. This new amplifier’s inputs can be configured in either single-ended or differential mode.
Superior EMI Performance, Filter-free
The NAU82039 amplifier does not need an external output filter, as each reduces electromagnetic interference through spread-spectrum-oscillator technology and slew-rate control. Moreover, the NAU82039 provides improved immunity and power supply rejection ratio, or PSRR, of > 90dB at 217Hz, making the devices ideal Class-D audio amplifiers for wireless and AM frequency band applications.
Leap Forward in Efficiency, Power
The Class D topology represents a significant leap forward in both power efficiency and noise minimization in audio devices. Class D amplifiers generate a square wave, making the wave-form binary so that it can be amplified by switching the power devices. The power efficiencies of Class D amplifiers are two-thirds better than those of Class AB devices.
The Class D NAU82039 is capable of driving a 4Ω load with up to 3.2W output power, and features a chip-enable pin for extremely low standby current and fast start-up time of 4ms.
The NAU82039 is available now in Miniature WLCSP-9 (1.21mm x 1.23mm in 0.4mm pitch) package and priced at $0.20.