AK5373EQ

ADCs/DACs - Special Purpose Overview

The AK5373EQ is a stereo analog-to-digital converter featuring an integrated USB 2.0 full-speed audio class interface. It incorporates a 24-bit stereo ADC, USB serial interface engine, transceiver, and audio processing blocks. The device supports sampling frequencies of 8kHz to 48kHz via an integrated PLL. Key electrical parameters include S/(N+D) of 85dB and S/N of 91dB at 0dB microphone gain (AVDD=3.3V). Power consumption is 30mA in active mode and under 100μA in suspend mode. Operating voltage ranges from 3.0V to 3.6V for both AVDD and DVDD.

ADCs/DACs - Special Purpose Feature Summary

• Integrated USB 2.0 compliant full-speed audio class controller with synchronous synchronization to 1ms SOF packets.
• 24-bit stereo A/D converter with mute control and digital programmable gain ranging from +24dB to -31dB in 1dB steps.
• Built-in microphone amplifier with selectable gains: 0dB, +6dB, +12dB, +18dB, +24dB, +30dB, or +36dB.
• EEP-ROM interface for storing customizable USB descriptors and system configuration data.

ADCs/DACs - Special Purpose Applications

• USB microphone modules
• Digital audio recording devices
• Voice recognition systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix matches the required temperature range (-10°C to +70°C) and package type (48-pin LQFP). Confirm that external EEPROM components meet the minimum 8k-bit capacity requirement for descriptor storage. Ensure power supply decoupling adheres to the recommended operating conditions for AVDD and DVDD.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a standalone USB audio input solution is required without a host microcontroller. Consider the integrated microphone amplifier if direct connection to low-level analog microphone elements is needed. Verify that the required sampling rates (up to 48kHz) and bit depths (up to 24-bit) align with the application's audio quality specifications.

ADCs/DACs - Special Purpose Part Context

The AK5373EQ belongs to the AK5373 series of USB audio converters manufactured by Asahi Kasei Microdevices (AKM). It is designed as a complete system-on-chip solution for USB audio capture, integrating the ADC, USB PHY, and protocol handling logic into a single 48-pin LQFP package.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate other AKM USB audio ADCs based on pin compatibility and feature set requirements.

ADCs/DACs - Special Purpose FAQ

How is the microphone amplifier gain configured?

The microphone amplifier gain is configured using the MGAIN2, MGAIN1, and MGAIN0 pins or bits, offering settings from 0dB to +36dB in 6dB increments.

What is the maximum supported sampling frequency?

The integrated PLL supports standard sampling frequencies up to 48kHz, including 8kHz, 11.025kHz, 16kHz, 22.05kHz, 32kHz, 44.1kHz, and 48kHz.

How does the device handle USB descriptor customization?

Descriptor information is stored in an external SPI EEPROM. The AK5373 reads this data upon reset to configure USB identifiers, audio formats, and endpoint settings.