AK4490EQ

Overview

The AK4490EQ is a high-performance digital-to-analog converter (DAC) chip manufactured by Asahi Kasei Microdevices Corporation. It belongs to the category of audio integrated circuits and is widely used in various audio equipment, including digital audio players, home theater systems, and professional audio devices.

Characteristics

• High-resolution audio playback: The AK4490EQ supports up to 32-bit/768kHz PCM and DSD512 formats, ensuring exceptional audio quality.
• Low distortion and noise: With its advanced architecture and circuit design, the AK4490EQ achieves low total harmonic distortion (THD) and noise levels, resulting in clear and accurate sound reproduction.
• Wide dynamic range: The DAC chip offers a wide dynamic range, allowing for faithful reproduction of both subtle details and powerful audio passages.
• Compact package: The AK4490EQ is housed in a small 48-pin LQFP package, making it suitable for space-constrained applications.
• Essence and packaging: The chip incorporates advanced digital filtering algorithms and high-quality analog output stages, providing a balanced combination of digital precision and analog warmth.
• Packaging/quantity: The AK4490EQ is typically supplied in tape and reel packaging, with a quantity of 250 units per reel.

Specifications

• Resolution: Up to 32-bit/768kHz PCM and DSD512
• Dynamic Range: 123dB
• Total Harmonic Distortion + Noise (THD+N): -112dB
• Sampling Rate: 8kHz to 768kHz
• Power Supply Voltage: 3.0V to 3.6V
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The AK4490EQ features a 48-pin LQFP package with the following pin configuration:

Functional Features

• Digital input interface: The AK4490EQ supports various digital audio interfaces, including I2S, left-justified, right-justified, and TDM.
• Built-in digital filters: The chip offers multiple selectable digital filters to tailor the audio output according to the user's preference.
• Dual-differential analog outputs: The AK4490EQ provides two sets of differential analog outputs, allowing for balanced audio signal transmission and improved noise rejection.
• On-chip voltage reference: The DAC chip incorporates an on-chip voltage reference, simplifying the external circuit design and reducing component count.

Advantages and Disadvantages

Advantages

• High-resolution audio playback capability
• Low distortion and noise levels
• Wide dynamic range
• Compact package size
• Integrated voltage reference

Disadvantages

• Requires external components for complete audio system integration
• Limited availability in small quantities

Working Principles

The AK4490EQ utilizes a multi-bit delta-sigma architecture combined with advanced digital signal processing techniques. It converts digital audio data into analog signals by employing oversampling and noise shaping algorithms, resulting in high-precision and low-distortion audio reproduction.

Application Field Plans

The AK4490EQ is widely used in various audio equipment applications, including: - Portable digital audio players - Home theater systems - Professional audio devices - Hi-Fi stereo systems - Automotive audio systems

Alternative Models

For those seeking alternative options, the following DAC chips can be considered: - AK4493EQ - ESS Sabre ES9038PRO - Texas Instruments PCM1794A

These alternatives offer similar performance and features to the AK4490EQ, providing flexibility for different design requirements.

In conclusion, the AK4490EQ is a high-performance DAC chip that excels in audio playback quality, offering a wide dynamic range and low distortion. Its compact package and versatile digital interfaces make it suitable for various audio applications. While it requires external components for complete system integration, the AK4490EQ remains a popular choice among audio enthusiasts and professionals alike.

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