AK5720VT

ADCs/DACs - Special Purpose Overview

The AK5720VT is a low-voltage, 24-bit stereo analog-to-digital converter (ADC) designed for digital audio systems. It integrates an input gain amplifier suitable for direct microphone applications and features single-ended analog inputs to eliminate external filter requirements. The device supports sampling frequencies from 8kHz to 96kHz with master clock options of 256fs, 384fs, 512fs, or 768fs. It operates on dual power supplies (VA and VD) ranging from 2.7V to 5.5V, typically 3V or 5V. Key performance metrics include a dynamic range of 102dB at 0dB gain and 94dB signal-to-noise ratio under standard conditions. The component is housed in a compact 16-pin TSSOP package.

ADCs/DACs - Special Purpose Feature Summary

• 24-bit resolution with integrated input gain amplifier offering selectable 0dB or +15dB gain.
• Single-ended analog input architecture simplifying design by removing the need for external filters.
• Supports MSB justified and I2S/TDM audio data formats with flexible master/slave clock modes.
• Built-in digital high-pass filter for DC-offset cancellation with a cutoff frequency scaling with sampling rate.

ADCs/DACs - Special Purpose Applications

• Microphone input stages in digital audio recording equipment
• Voice recognition and voice control system front-ends
• Conferencing equipment and smart speaker arrays
• Portable audio devices and IC recorders

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm pinout compatibility and packaging type. Ensure that the supply voltage levels match the recommended operating conditions of 2.7V to 5.5V for both analog and digital domains. Confirm that the application environment stays within the specified -40°C to 105°C operating temperature range.

ADCs/DACs - Special Purpose Selection Notes

Select this component when single-ended microphone inputs are required without differential signaling complexity. Choose between Sharp Roll-Off and Short Delay digital filters based on group delay sensitivity requirements. Ensure the system clock generator can provide the necessary MCLK frequencies (up to 768fs) if operating in slave mode. Verify that the interface format (I2S, MSB, or TDM) aligns with the connected digital processor.

ADCs/DACs - Special Purpose Part Context

The AK5720VT belongs to the AK5720 series of audio ADCs from Asahi Kasei Microdevices. It is part of a family of low-power, high-performance converters designed for professional and consumer audio applications. The 'VT' suffix denotes the specific tape-and-reel packaging variant in the 16-pin TSSOP form factor.

ADCs/DACs - Special Purpose Replacement Considerations

Check for updated revision history in the official datasheet regarding any changes to electrical characteristics or pin definitions. Verify compatibility with existing PCB layout constraints, particularly regarding the 16-pin TSSOP footprint and decoupling capacitor placement near VCOM and power pins.

ADCs/DACs - Special Purpose FAQ

How does the AK5720 handle DC offset?

The device includes a digital high-pass filter specifically for DC-offset cancellation. The cutoff frequency is 1.0Hz at a 48kHz sampling rate and scales proportionally with the selected sampling frequency.

What is the maximum input voltage level?

The full-scale input voltage is proportional to the analog supply voltage (VA). At VA=3.0V, the typical input level is 1.8Vpp at 0dB gain. At VA=5.0V, it is 3.0Vpp at 0dB gain.

Can the AK5720 operate in TDM mode?

Yes, the AK5720 supports TDM256 mode. Up to four devices can be cascaded in TDM mode to output multi-channel data, with the DIF/TDMI pin functioning as a TDM data input in this configuration.