AK4468VN

Overview

The AK4468VN is a 32-bit, 8-channel premium audio DAC from Asahi Kasei Microdevices utilizing VELVET SOUND technology. It supports PCM inputs up to 768 kHz and DSD512. Key electrical parameters include a dynamic range of 117 dB, THD+N of -107 dB, and a differential output voltage of 5.6 Vpp at AVDD = 5.0 V. The device operates on analog supplies of 3.0–5.5 V and digital supplies of 1.7–3.6 V (or 3.0–3.6 V with internal LDO). It features six digital filter types, automatic PCM/DSD switching, and interfaces including I2S, TDM, SPI, and I2C.

Feature Summary

• 8-Channel Architecture: Provides four stereo pairs with independent differential outputs.
• High Performance: Achieves 117 dB dynamic range and -107 dB THD+N.
• Digital Filters: Includes six selectable filters such as Sharp Roll-off and Low Dispersion Short Delay.
• Interface Support: Compatible with I2S, TDM, MSB/LSB justified formats, and DSD.

Applications

• AV Receivers
• Car Audio Systems
• Network Audio Players

Procurement Notes

Verify the package type is 48-QFN (7x7) with an exposed pad. Confirm power supply requirements match the design, specifically the choice between using the internal LDO or external 1.8V supply via the LDOE pin. Ensure the operating temperature range of -40°C to 105°C meets system specifications.

Selection Notes

Select this component for high-channel-count applications requiring premium audio quality. Consider the 5.6 Vpp differential output when designing load circuits; ensure load resistance is at least 1.4 kΩ. Verify that the host controller supports the required serial interface protocols (I2C/SPI) for register configuration.

Part Context

The AK4468VN belongs to AKM's Premium DAC series, designed for high-resolution audio playback. It incorporates OSR-Doubler technology to reduce out-of-band noise while maintaining low power consumption. The device is part of the broader AK44xx family of audio converters.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer for direct replacements or evaluate other models within the AK44xx series based on channel count and performance requirements.

FAQ

What is the maximum sampling rate supported by the AK4468VN?

The AK4468VN supports PCM input sampling rates up to 768 kHz and DSD input up to DSD512.

How does the LDOE pin affect power supply configuration?

When LDOE is High, the internal LDO generates 1.8V for TVDD (TVDD 3.0-3.6V). When LDOE is Low, an external 1.8V supply must be provided to VDD18 (VDD18 1.7-1.98V), allowing TVDD to operate from 1.7-3.6V.

What digital filter options are available?

The device offers six types: Sharp Roll-off, Slow Roll-off, Short Delay Sharp Roll-off, Short Delay Slow Roll-off, Super Slow Roll-off, and Low Dispersion Short Delay Filter.