AK5704EN

ADCs/DACs - Special Purpose Overview

The AK5704EN is a high-performance analog front-end ADC IC featuring a built-in 4-channel 32-bit ADC and low-noise microphone amplifier. It achieves a dynamic range of 105 dB with THD+N of -90 dB at 0 dB gain. The device supports sampling frequencies up to 192 kHz and includes a digital voice activity detector (VAD) for ultra-low power consumption during wait times. Power supplies are AVDD (1.7–1.9 V or 3.0–3.6 V) and TVDD (1.65–3.6 V). It operates within an ambient temperature range of -40°C to 85°C and is housed in a 28-pin QFN package.

ADCs/DACs - Special Purpose Feature Summary

• 4-Channel Low-Power 32-bit ADC with integrated MIC Amplifier (+30 dB to 0 dB gain)
• Built-in Digital Voice Activity Detector (VAD) for reduced system power consumption
• Programmable Digital Filters including Mixer, HPF, LPF, and Digital ALC
• Supports Cascade TDM Interface for expanding up to 16 channels

ADCs/DACs - Special Purpose Applications

• Voice recognition systems
• Voice control interfaces
• Conferencing systems
• Microphone array systems
• Smart speakers

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and tape specifications. Confirm that the component meets RoHS and Halogen-free requirements as stated in the datasheet. Ensure the supply voltage levels match the selected AVDDL bit configuration for either 1.8V or 3.3V operation.

ADCs/DACs - Special Purpose Selection Notes

Select the AK5704EN when a 4-channel ADC with integrated microphone amplification is required. Choose this part for applications needing high dynamic range (105 dB) and low power consumption via the built-in VAD. Consider cascade TDM capabilities if more than four channels are needed. Ensure the host system supports the required I2C control interface and audio formats such as I2S or TDM.

ADCs/DACs - Special Purpose Part Context

The AK5704EN belongs to Asahi Kasei Microdevices' line of analog front-end converters designed for voice processing. It integrates analog and digital functions to simplify system design by reducing external component count. The device is optimized for high signal-to-noise ratio performance in compact packages suitable for modern consumer electronics.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs by checking pinout, electrical characteristics, and software register maps before considering alternative components.

ADCs/DACs - Special Purpose FAQ

What is the maximum sampling frequency supported by the AK5704EN?

The AK5704EN supports sampling frequencies up to 192 kHz.

How does the AK5704EN reduce power consumption during idle states?

It incorporates an ultra-low power consumption digital Voice Activity Detector (VAD) that significantly reduces power usage during wait times.

Can the AK5704EN support more than 4 microphone channels?

Yes, by connecting multiple AK5704EN devices using the Cascade TDM interface, it can support up to 16 microphone channels.