AK4191EQ

ADCs/DACs - Special Purpose Overview

The AK4191EQ is a 64-bit stereo digital delta-sigma modulator designed for high-resolution audio playback. It supports PCM inputs up to 1536 kHz and DSD1024, utilizing a built-in 64-bit digital filter with 256x or 128x oversampling. The device features six selectable digital filter types, including sharp roll-off and low dispersion options. It provides a 7-bit multi-bit delta-sigma modulator output interface for connection to external analog DACs. Power supplies include PVDD (3.0–3.6 V), TVDD (1.7–3.6 V), and DVDD (1.14–1.3 V). The component operates within a temperature range of -40°C to +85°C and is housed in a 64-pin HTQFP package.

ADCs/DACs - Special Purpose Feature Summary

• Supports extreme high-resolution audio formats: PCM up to 1536 kHz and DSD1024.
• Integrates a 64-bit digital filter with six selectable modes, offering attenuation up to 150 dB.
• Features a 7-bit multi-bit delta-sigma modulator output for discrete DAC architectures.
• Includes programmable digital attenuator (-127 dB to +6.0 dB) and soft mute functions.

ADCs/DACs - Special Purpose Applications

• Network Audio systems
• USB DACs
• CD/SACD Players
• Wireless Speaker Systems
• Digital Audio Interfaces

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm package type and tape/reel specifications. Ensure power supply decoupling capacitors are placed close to the PVDD, TVDD, and DVDD pins as recommended in the application circuit guidelines. Confirm that the host system supports the required 4-wire serial or I2C control interfaces for register configuration.

ADCs/DACs - Special Purpose Selection Notes

Select this component when designing a fully separated digital/analog DAC architecture requiring a dedicated digital processing stage. It is suitable for applications demanding support for DSD1024 and PCM 1536kHz. Designers must pair this modulator with an external analog DAC chip capable of accepting 7-bit multi-bit data. Consider the available digital filter characteristics if phase linearity or group delay is critical to the application.

ADCs/DACs - Special Purpose Part Context

The AK4191EQ belongs to the AK4x series of audio ICs from Asahi Kasei Microdevices. It serves as the digital front-end in premium discrete DAC solutions, often paired with analog converters like the AK4499EX. This separation allows for independent optimization of digital filtering and analog conversion stages, minimizing digital noise interference in the analog output domain.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer for current alternative recommendations or verify compatibility with existing digital filter and modulation requirements if considering cross-brand components.

ADCs/DACs - Special Purpose FAQ

What digital input formats does the AK4191EQ support?

The AK4191EQ supports PCM inputs up to 1536 kHz and DSD inputs up to DSD1024. It also handles DSD64, DSD128, DSD256, and DSD512 formats.

How many digital filter types are available in the AK4191EQ?

The device includes six types of high-quality digital filters: Short Delay Sharp Roll-off, Short Delay Slow Roll-off, Sharp Roll-off, Slow Roll-off, Super Slow Roll-off, and Low Dispersion Short Delay Filter.

What is the bit depth of the delta-sigma modulator output?

The AK4191EQ outputs 7-bit multi-bit delta-sigma modulator data to the external analog DAC.