NAU8402WG

ADCs/DACs - Special Purpose Overview

The NAU8402WG is a stereo 24-bit digital-to-analog converter (DAC) manufactured by Nuvoton Technology Corporation. It features an integrated charge pump that enables true ground-referenced analog outputs with a full-scale level of 2Vrms while operating from a single 3.3V supply. The device supports I2S slave interfaces up to 96kHz sample rates and includes automatic pop/click elimination. Key electrical specifications include a typical signal-to-noise ratio (SNR) of 98dB, -82dB THD+N, and 108dB channel separation at 1kHz. It operates within a temperature range of -40°C to +85°C.

ADCs/DACs - Special Purpose Feature Summary

• Stereo 24-bit DAC with integrated charge pump for true ground-referenced 2Vrms output on a single 3.3V supply
• High audio performance: 98dB SNR, -82dB THD+N, and 108dB channel separation at 1kHz
• I2S slave interface supporting up to 96kHz sample rate with automatic master clock detection
• Automatic pop/click elimination and output muting for power-on and no-signal conditions

ADCs/DACs - Special Purpose Applications

• Game Consoles
• DVD players
• Set top boxes
• Digital TVs

ADCs/DACs - Special Purpose Procurement Notes

Verify the datasheet revision (Rev1.7) matches the specific batch requirements. Confirm that the TSSOP-16 package dimensions (4.96x6.4 mm) fit the target PCB layout. Ensure the design accounts for the separate analog (VDDA/VSSA) and digital (VDDB) power domains as specified in the operating conditions.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a single-supply 3.3V operation is required with high-fidelity audio output. The integrated charge pump eliminates the need for external negative voltage generation. Ensure the host system provides valid MCLK/FS ratios of 256±3 or 512±3 for proper clock detection and operation.

ADCs/DACs - Special Purpose Part Context

The NAU8402 is part of Nuvoton's stereo DAC portfolio, designed for portable and general audio applications. It simplifies system integration by combining the DAC, digital filters, and line drivers in a low-pin-count package. The 'WG' suffix indicates a 16-pin TSSOP package with green (lead-free) material compliance.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other stereo 24-bit DACs with similar I2S interfaces and charge pump capabilities if replacement is necessary.

ADCs/DACs - Special Purpose FAQ

How does the NAU8402 achieve ground-referenced outputs?

It uses an integrated charge pump powered by LINEVDD to generate a negative supply rail (CPOUT), allowing the line out drivers to swing below ground while the main supply remains at 3.3V.

What are the supported master clock frequencies?

The device supports 12.288MHz or 24.576MHz for 24k/48k/96kHz sampling rates, and 11.290MHz or 22.579MHz for 44.1kHz sampling rates.

What happens during the mute sequence?

The device ramps digital volume down to mute, then performs a soft mute on the line driver. The charge pump continues to operate as long as the master clock is present during this state.