AK4421AET

ADCs/DACs - Special Purpose Overview

The AK4421AET is a 3.3V, 24-bit stereo digital-to-analog converter (DAC) featuring an integrated single-ended output buffer capable of delivering a ground-referenced 2Vrms signal. Utilizing AKM’s multi-bit modulator architecture with switched-capacitor and continuous-time filters, it achieves a dynamic range of 102dB and THD+N of -92dB. The device supports sampling rates from 8kHz to 192kHz via I2S or MSB justified interfaces. It includes a charge pump for negative rail generation, soft mute functionality, and operates within a -20°C to +85°C temperature range in a compact 16-pin TSSOP package.

ADCs/DACs - Special Purpose Feature Summary

• 24-bit resolution with 192kHz maximum sampling rate and 102dB dynamic range
• Integrated 2Vrms single-ended output buffer with internal charge pump
• High jitter tolerance via switched-capacitor filter architecture
• Supports I2S and 24-bit MSB justified serial data formats

ADCs/DACs - Special Purpose Applications

• Portable A/V players
• Set-top boxes
• Digital televisions

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'ET' corresponds to the standard 16-pin TSSOP variant (-20 to +85°C). Confirm that peripheral components, specifically low ESR capacitors for the charge pump circuit, are included in the supply chain plan as they are critical for proper operation.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a ground-referenced analog output is required without external level shifting. Ensure the system clock configuration aligns with the 512fs/768fs requirement for optimal dynamic range performance at standard sampling rates like 44.1kHz or 48kHz.

ADCs/DACs - Special Purpose Part Context

The AK4421AET belongs to the AK442x family of audio DACs. It serves as a 3.3V successor to earlier 5V models like the AK4420 and AK4424. It shares pin compatibility with the AK4421 and AK4423, though interface configurations may vary slightly between variants.

ADCs/DACs - Special Purpose Replacement Considerations

The datasheet explicitly lists compatibility with AK4420, AK4421, AK4424, and AK4423. Verify voltage requirements, as the AK4420 and AK4424 operate at 4.5V to 5.5V, whereas the AK4421A requires 3.0V to 3.6V.