AK4366VT

Digital To Analog Converters Overview

The AK4366VT is a 24-bit stereo digital-to-analog converter (DAC) with an integrated headphone amplifier, manufactured by Asahi Kasei Microdevices. It utilizes a multi-bit delta-sigma architecture with 64x oversampling and an on-chip FIR interpolator. The device supports sampling rates from 8kHz to 48kHz and operates on a single power supply ranging from 2.2V to 3.6V. Key electrical specifications include a signal-to-noise ratio of 92dB at 2.4V and an output power of 50mW per channel into a 16Ω load at 3.3V. The component is housed in a compact 16-pin TSSOP package.

Digital To Analog Converters Feature Summary

• Integrated Headphone Amplifier: Delivers 50mW x 2ch @ 16Ω with pop-free power-on/off and mute control.
• Digital Audio Interface: Supports I2S, 24/20/16-bit MSB/LSB justified formats via SDATA, BICK, and LRCK pins.
• Advanced Filtering: Features a 64x oversampling DAC with an 8-times FIR interpolator providing ±0.02dB passband ripple and 54dB stopband attenuation.
• Low Power Operation: Consumes only 2.6mA at 2.4V with the headphone amplifier idle.

Digital To Analog Converters Applications

• Portable audio players and MP3 devices
• Mobile phones and smartphones
• Car entertainment systems

Digital To Analog Converters Procurement Notes

Verify the ordering suffix VT corresponds to the standard 16-pin TSSOP package with a 0.65mm pitch as documented in the official datasheet. Ensure that the P/S pin is correctly configured for either parallel or serial control mode during integration, as this determines the available feature set such as digital attenuation and soft mute.

Digital To Analog Converters Selection Notes

Select the AK4366VT for applications requiring a low-power, space-constrained solution with built-in amplification. It is suitable for systems operating between 2.2V and 3.6V. Note that the maximum supported sampling rate is 48kHz; higher resolution audio streams may require external downsampling or a different component.

Digital To Analog Converters Part Context

The AK4366VT is part of the AK4366 series from Asahi Kasei Microdevices. It is designed as a complete audio output stage, combining high-fidelity DAC conversion with sufficient drive capability for headphones. The evaluation board AKD4366 is available for development purposes.

Digital To Analog Converters Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Designers should consult the manufacturer's documentation for potential cross-references or updated product line replacements.

Digital To Analog Converters FAQ

How is the pop noise prevented during power-up?

The AK4366VT features a 'pop-free' power-on mechanism. A capacitor connected between the MUTET pin and ground controls the rise time of the common voltage, ensuring smooth transitions and eliminating audible clicks.

What is the function of the DFS1 bit?

The DFS1 bit adjusts the oversampling rate to improve dynamic range and signal-to-noise ratio at lower sampling frequencies. Setting DFS1 to '1' increases the oversampling rate to 256fs, improving S/N to 92dB at 8kHz-12kHz, but requires MCLK to be 512fs.

Can the AK4366VT handle AC coupled MCLK input?

Yes, the device supports AC coupling for the Master Clock (MCLK) input. This must be enabled by setting the MCKAC bit to '1' in the Mode Control register.