AK4426VT

ADCs/DACs - Special Purpose Overview

The AK4426VT is a 192kHz, 24-bit stereo Delta-Sigma DAC featuring an integrated single-ended output buffer capable of delivering a 2Vrms signal. It utilizes AKM’s multi-bit modulator architecture to achieve a dynamic range of 106dB and THD+N of -91dB. The device supports sampling rates from 8kHz to 192kHz with oversampling ratios of 32x, 64x, or 128x. Internal charge pump circuitry generates a negative rail for ground-referenced outputs. Control is managed via an I2C-bus interface, while audio data accepts formats including I2S and MSB/LSB justified configurations.

ADCs/DACs - Special Purpose Feature Summary

• 24-bit resolution with 192kHz maximum sampling rate
• Integrated 2Vrms single-ended output buffer with internal charge pump
• Dynamic Range: 106dB; THD+N: -91dB
• I2C control interface with digital attenuator (256 steps) and soft mute
• Supports Sharp and Slow roll-off digital filters

ADCs/DACs - Special Purpose Applications

• DVD players and AV receivers
• Set-top boxes
• Consumer audio systems requiring high linearity

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix VT corresponds to the 16-pin TSSOP package with a 0.65mm pitch as defined in the ordering guide. Confirm that the supply voltage requirements (+4.5V to +5.5V) match the system design. Ensure low ESR capacitors are selected for the charge pump connections (CP, CN, VEE) to maintain stability across the operating temperature range.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a ground-referenced analog output is required without external negative supply rails. The internal charge pump simplifies board layout by eliminating the need for external negative voltage generation. Consider the 16-pin TSSOP footprint constraints and ensure adequate decoupling for the VDD and AVDD pins to support the specified current consumption during normal operation.

ADCs/DACs - Special Purpose Part Context

The AK4426VT belongs to the AK4426 series manufactured by Asahi Kasei Microdevices (AKM). It is designed as a space-saving solution for consumer audio applications, integrating both the DAC core and the output buffer into a single 16-pin package. The device replaces discrete DAC and amplifier solutions by providing a complete conversion and buffering stage.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical specifications against alternative DACs if sourcing issues arise.

ADCs/DACs - Special Purpose FAQ

How is the negative power supply generated for the output buffer?

The AK4426 uses an internal charge pump circuit connected to pins CP, CN, and VEE. A 1.0μF low ESR capacitor connects CP to CN, and another connects VSS1 to VEE to generate the necessary negative rail for ground-referenced output.

What is the default audio interface format?

The default audio interface format is Mode 2, which is 24-bit MSB justified. This is set by the DIF bits in Control Register 00H.

Can the AK4426 operate in Auto Setting Mode for Master Clock?

Yes, by setting the ACKS bit in Control Register 00H to '1', the device automatically detects the MCLK frequency and adjusts the internal clock divider accordingly, removing the need for manual DFS configuration.