AK4420ET

ADCs/DACs - Special Purpose Overview

The AK4420ET is a 5V stereo digital-to-analog converter (DAC) featuring a 24-bit resolution and support for sampling rates up to 192kHz. It integrates a single-ended 2Vrms output buffer with an internal charge pump that generates a negative rail, enabling ground-referenced audio signals. The device utilizes a multi-bit modulator architecture combined with switched-capacitor and continuous-time filters to maintain linearity and reduce clock jitter effects. Key electrical specifications include a dynamic range of 105dB and THD+N of -92dB. It operates on a single +4.5V to +5.5V supply and is housed in a 16-pin TSSOP package.

ADCs/DACs - Special Purpose Feature Summary

• 24-bit resolution with 192kHz maximum sampling rate
• Integrated 2Vrms output buffer with internal charge pump for ground-referenced output
• Switched-capacitor filter providing high tolerance to clock jitter
• Supports I2S and 24-bit MSB justified serial data interfaces

ADCs/DACs - Special Purpose Applications

• DVD players
• AV receiver systems
• Set-top boxes

ADCs/DACs - Special Purpose Procurement Notes

Verify component authenticity through authorized channels as the AK4420ET may be subject to discontinuation or lifecycle changes. Confirm the specific temperature grade (ET: -20°C to +85°C) matches system requirements. Ensure peripheral components, particularly low ESR capacitors for the charge pump circuit, meet the datasheet specifications to guarantee stable operation and performance.

ADCs/DACs - Special Purpose Selection Notes

Select the AK4420ET when a 5V single-supply audio DAC with integrated buffering is required. It is suitable for applications needing high jitter immunity via its switched-capacitor filter. Compare against the AK4421 or AK4424 if pin compatibility or different power supply voltages are needed, noting that the AK4420 lacks digital de-emphasis features available in some sibling models.

ADCs/DACs - Special Purpose Part Context

The AK4420ET belongs to the AK4420 family from Asahi Kasei Microdevices (AKM). It shares pinout compatibility with the AK4421 and AK4424, facilitating design transitions within product lines. The 'ET' suffix denotes the extended temperature range of -20°C to +85°C, distinguishing it from the VT variant which supports -40°C to +85°C.

ADCs/DACs - Special Purpose Replacement Considerations

The AK4421 and AK4424 are pin-compatible alternatives within the same family. Designers should verify functional differences, such as the absence of digital de-emphasis in the AK4420 compared to the AK4424, before substituting.