AK5371VQ

ADCs/DACs - Special Purpose Overview

The AK5371VQ is a stereo A/D converter with an integrated USB interface, manufactured by Asahi Kasei Microdevices. It combines a 16-bit ADC, USB serial interface engine, transceiver, and audio class processing unit into a single chip. The device supports sampling frequencies of 8kHz, 11.025kHz, 22.05kHz, 44.1kHz, and 48kHz using an on-chip PLL with a single crystal. It features a programmable gain amplifier (IPGA) ranging from +24dB to -31dB and a fixed 20dB pre-amplifier. The analog-to-digital signal-to-noise ratio is 84dBA at 44.1kHz with 0dB gain. Power consumption is 26mA in normal operation and less than 1µA in suspend mode.

ADCs/DACs - Special Purpose Feature Summary

• Integrated USB Audio Controller with Serial Interface Engine, Transceiver, and Audio Class Encoder/Decoder
• 16-bit Stereo ADC with 84dBA S/N ratio and Programmable Gain Amplifier (+24dB to -31dB)
• Supports 5 Sampling Frequencies (8kHz to 48kHz) via On-chip PLL
• EEPROM Interface for Customizing Device and String Descriptors

ADCs/DACs - Special Purpose Applications

• USB Microphones
• Conferencing Systems
• Voice Recognition Applications
• Karaoke Systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type matches the specific suffix; the VQ suffix denotes a 48-pin LQFP package. Confirm that the design includes the required external components such as a 11.2896MHz crystal resonator and appropriate loop filter capacitors. Ensure the EEPROM connection meets Microwire specifications if custom descriptors are required.

ADCs/DACs - Special Purpose Selection Notes

Select this component for applications requiring a complete USB audio input solution without a separate microcontroller. The AK5371VQ is suitable for designs needing low power consumption and high integration. Consider the 48-pin LQFP package constraints for PCB layout. Verify compatibility with USB Audio Class 1.0 specifications.

ADCs/DACs - Special Purpose Part Context

The AK5371VQ belongs to the AK5371 series of stereo A/D converters with USB interfaces. It is designed to simplify USB microphone development by integrating all necessary functions for USB audio class compliance. The device eliminates the need for external memory or transceivers, reducing component count and board space.

ADCs/DACs - Special Purpose Replacement Considerations

No direct replacement part numbers are documented in the provided datasheet. Designers should evaluate other USB audio ADCs from Asahi Kasei Microdevices or competitors based on pin compatibility and functional requirements.

ADCs/DACs - Special Purpose FAQ

What sampling frequencies does the AK5371 support?

The AK5371 supports five sampling frequencies: 8kHz, 11.025kHz, 22.05kHz, 44.1kHz, and 48kHz.

How is the gain controlled in the AK5371?

The AK5371 includes a 20dB fixed gain pre-amplifier and a Programmable Gain Amplifier (IPGA) with a range of +24dB to -31dB in 1dB steps.

Can the USB descriptors be customized?

Yes, the AK5371 has an EEPROM interface that allows customization of the Device Descriptor and String Descriptor using 1K, 2K, or 4K bit Microwire-type EEPROM.