AK4385VT

Digital To Analog Converters Overview

The AK4385VT is a 2-channel, 24-bit stereo digital-to-analog converter (DAC) utilizing Asahi Kasei Microdevices' multi-bit delta-sigma architecture. It supports sampling rates from 8kHz to 192kHz with dynamic range and signal-to-noise ratios of 108dB. The device features full differential switched-capacitor filter (SCF) outputs, eliminating the need for external AC coupling capacitors. It operates on a single 5V supply within a 16-pin TSSOP package measuring 6.4mm x 5.0mm.

Digital To Analog Converters Feature Summary

• Multi-bit delta-sigma modulator architecture providing 108dB dynamic range and -94dB THD+N.
• Integrated full-differential SCF outputs remove the requirement for external AC coupling capacitors.
• Supports 16/20/24-bit audio data formats including I2S, MSB justified, and LSB justified.
• Includes channel-independent digital attenuator with 256 linear steps and soft mute functionality.

Digital To Analog Converters Applications

• DVD-Audio systems
• High-fidelity audio amplifiers
• Professional audio equipment

Digital To Analog Converters Procurement Notes

Verify that the component marking indicates 'AK4385VT' to confirm the extended temperature range (-40°C to +85°C). Ensure the package is the standard 16-pin TSSOP with 0.65mm pitch. Confirm lead-free solder plating on the copper lead frame as specified in the datasheet revision history.

Digital To Analog Converters Selection Notes

Select the AK4385VT over the AK4385ET variant when operation below -20°C is required. This part requires a 5V power supply (4.75V to 5.25V). It is pin-compatible with the AK4381 but offers higher performance specifications. Ensure the system design accommodates the differential output configuration.

Digital To Analog Converters Part Context

The AK4385VT belongs to the AK4385 family of 24-bit stereo DACs manufactured by Asahi Kasei Microdevices. It shares the same core architecture and pinout as the AK4385ET, differing primarily in the operating temperature range. The evaluation board for this series is designated as AKD4385.

Digital To Analog Converters Replacement Considerations

The AK4381 is documented as pin-compatible with the AK4385. Verify specific electrical parameter differences before substitution.

Digital To Analog Converters FAQ

How does the AK4385 handle DC offset?

DC offset is eliminated without AC coupling because the analog outputs are fully differential. The internal common voltage is approximately VDD/2.

What is the function of the DZF pins?

The DZFL and DZFR pins indicate zero detection. They go high when input data is continuously zero for 8192 LRCK cycles, configurable for channel separation or ANDed modes.

Can the AK4385 operate in auto-setting mode?

Yes, by setting the ACKS bit to '1', the device automatically detects the MCLK frequency and selects the appropriate sampling speed mode.