NAU8214SG

Overview

The NAU8214SG is a mono high-efficiency filter-free Class-D audio amplifier in an 8-pin SOP package. It delivers up to 2.9W output power into a 4Ω load at 5V supply with 10% THD+N, or 2.3W at 1% THD+N. Quiescent current is 1.4mA at 3.6V and 2.7mA at 5V. The device features a 4ms start-up time, low output noise of 56µVRMS (A-weighted), and 82dB PSRR at 217Hz. It supports single-ended or differential inputs and includes thermal, short-circuit, and under-voltage protection.

Feature Summary

• Integrated max power limiting function configurable via external resistor for load-specific power control
• Spread spectrum oscillator with slew rate control to minimize electromagnetic interference without output filters
• Built-in click-and-pop suppression circuitry to reduce audible transients during power state transitions
• Digital chip enable pin enabling extremely low standby current consumption and rapid system wake-up

Applications

• Smartphones
• Tablet PCs
• Personal Navigation Devices
• Rugged hand held computers
• Two-way radios

Procurement Notes

Verify the specific suffix 'SG' confirms the 8-pin SOP package and green material composition as documented in the ordering information section. Ensure the revision level matches the design requirements, as component specifications may evolve across datasheet revisions. Cross-reference the absolute maximum ratings with your system's voltage and thermal constraints to ensure safe operation within the specified limits.

Selection Notes

Select this component when a compact mono amplifier solution is required for battery-powered portable devices. The SOP-8 package offers a small footprint suitable for space-constrained layouts. Consider the internal power limiting feature if precise output power management is needed for specific speaker impedances without external complex circuitry. Verify input configuration compatibility, as the device supports both single-ended and differential modes.

Part Context

The NAU8214 series includes variants such as the NAU8214YG, which utilizes a 20-pin MQFN package. The NAU8214SG specifically denotes the 8-pin SOP version. Both variants share the same core amplifier architecture and electrical characteristics but differ in physical dimensions and thermal dissipation capabilities due to their distinct packaging technologies.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Nuvoton Technology Corporation for official cross-reference recommendations or alternative product lines that meet similar performance criteria.

FAQ

How is the maximum output power limited on the NAU8214SG?

The maximum output power is limited by connecting an external resistor (RLMT) to the PLMT pin. This allows configuration for either VDD-independent or VDD-dependent power limiting thresholds.

What protection mechanisms are included in the NAU8214SG?

The device includes thermal overload protection (shutdown at 150°C), short-circuit protection (detects shorts >16.7µs), and supply under-voltage protection (disables outputs below 2.1V).

Can the NAU8214SG operate without an output filter?

Yes, it is designed as a filter-free Class-D amplifier. However, ferrite bead or LC filters may be added if long trace lengths between the amplifier and speaker cause EMI issues.