The New High-Efficiency Audio Solution Ideal for Dashboard, eCall, and T-Box Applications
Nuvoton announced NAU83U25YG, a new automotive-grade Class-D audio amplifier. The NAU83U25YG Class-D amplifier features high-efficiency stereo, digital input, and delivers up to 3W (4 Ω load) or 1.7W (8 Ω load) output power. Featuring a two-wire gain adjustment interface, it is the ideal choice for automotive electronics applications such as dashboards, eCall, and T-Box systems.
As automotive electronics enter the era of the “smart cockpit,” vehicle intelligence has become a key industry focus. This trend is driving increasing functional requirements for audio solution providers in automotive applications. Nuvoton Technology strictly adheres to automotive industry standards, offering AEC-Q100 qualified products for automotive applications. To simplify system design, our solutions support digital I2S audio signal input from the vehicle’s main controller, reducing the need for external components and minimizing PCB size. Additionally, our digital amplifiers help prevent circuit interference and effectively solve EMI issues.
The NAU83U25YG stereo Class-D audio amplifier has advanced features like 80 dB PSRR, 90% efficiency, ultra-low quiescent current (i.e. 2.1 mA at 3.7V for 2 channels) and superior EMI performance. It offers lower distortion, reduced background noise, and a wider dynamic range. Additionally, this new amplifier supports comprehensive device protection.
NAU83U25YG Key Features
- Gain Setting via I²C interface, 22 dB to -62 dB
- Powerful Stereo Class-D Amplifier, 2ch x 3.0W (4Ω @ 5V, 10% THD+N)
- Low Output Noise: 18 μVrms @ 0 dB gain
- Comprehensive Device Protection:
- Overcurrent Protection (OCP)
- Undervoltage Lockout (UVLO)
- Overtemperature Protection (OTP)
- Clock Termination Protection (CTP)
- Click-and-Pop Suppression
- Package: QFN-20
- Operating Temperature Range: -40℃ ~ +105℃
- Automotive Grade: AEC-Q100 qualification & TS16949 compliant
Superior EMI Performance, Filter-Free
The NAU83U25YG amplifier stands out by eliminating the need for an external output filter, thanks to its spread-spectrum-oscillator technology and slew-rate control, effectively reducing electromagnetic interference (EMI). Moreover, it offers enhanced immunity and power supply rejection ratio (PSRR) of > 80 dB at 217 Hz. Making the NAU83U25YG an excellent fit for Class-D audio amplifiers in wireless and AM (Amplitude Modulation) 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. By generating a binary square wave, Class-D amplifiers efficiently amplify the signal through power device switching. Compared to Class-AB devices, Class-D amplifiers offer power efficiencies that are two-thirds better.
The NAU83U25YG Class-D audio amplifier excels in driving a 4 Ω load with an impressive output power of up to 3W and fast start-up time of just 14 msec.
NAU83U25YG Target Applications
The new Class-D audio amplifier is designed for automotive electronics applications including dashboards, eCall, ADAS (Advanced Driver Assist Systems) and T-Box.
