The Analog Devices AD1890JN is a highly versatile and advanced digital audio sample rate converter (SRC) designed to provide seamless conversion of audio data between different sample rates. This device is part of Analog Devices' family of audio solutions and is primarily used in applications where high-quality audio signal conversion is critical, such as in professional audio equipment, digital audio interfaces, and broadcast systems.

## General Overview

The AD1890JN is designed to perform high-precision, low-latency sample rate conversion with minimal distortion and jitter. Its primary function is to convert audio signals from one sample rate to another without introducing audible artifacts. The device is equipped with a range of features that ensure exceptional audio quality, including advanced interpolation algorithms, noise shaping, and efficient processing of both high and low sample rates.

## Key Features

* High-Quality Audio Conversion: The AD1890JN delivers transparent and high-fidelity audio sample rate conversion with minimal distortion, noise, or phase artifacts.
* Wide Input/Output Sample Rate Range: It supports a broad range of input and output sample rates, typically from 8 kHz to 192 kHz, ensuring compatibility with various audio systems.
* Low Jitter and Latency: The device is designed to operate with very low jitter and low latency, making it suitable for real-time audio applications where timing is critical.
* Multi-Channel Support: The AD1890JN supports multiple audio channels, making it suitable for multi-channel audio processing in applications like surround sound systems and digital audio mixing consoles.
* Low Power Consumption: Despite its high processing capabilities, the AD1890JN operates with low power consumption, making it ideal for portable or energy-efficient systems.

## Electrical Characteristics

* Operating Voltage: The AD1890JN operates within a voltage range of 3.3V to 5V, ensuring compatibility with both low-voltage and standard voltage systems in modern audio devices.
* Current Consumption: Typical current consumption is approximately 60 mA at 5V, which is relatively low for a high-performance audio processing device.
* Power Consumption: Power consumption is optimized for real-time operation, making the AD1890JN suitable for systems that require continuous audio processing with minimal energy impact.
* Temperature Range: The operating temperature range is from -40°C to +85°C, ensuring reliable performance in various environmental conditions, from industrial environments to consumer-grade audio equipment.

## Performance and Audio Quality

* Resolution and Precision: The AD1890JN supports 24-bit audio resolution, which ensures high precision in audio processing, maintaining the integrity of the original audio signal even after conversion.
* Advanced Interpolation Algorithms: The device uses advanced interpolation algorithms to ensure smooth sample rate conversion, even for large differences in sample rates. These algorithms help minimize distortions, ensuring high-quality audio output.
* Noise Shaping: The AD1890JN incorporates noise shaping techniques to suppress quantization noise, ensuring that any artifacts introduced during the conversion process are inaudible to the human ear.
* THD+N (Total Harmonic Distortion + Noise): The AD1890JN features low total harmonic distortion (THD) and noise, contributing to its high fidelity and transparent audio output.

## Interfaces and Integration

* Digital Audio Inputs and Outputs: The AD1890JN provides both serial and parallel audio input and output options, allowing easy integration into various audio systems.

* I²S Interface: It supports I²S (Inter-IC Sound) interface, a widely used digital audio standard, ensuring compatibility with a wide range of audio processors and other digital devices.
* Left-Justified and Right-Justified Formats: The device supports both left-justified and right-justified audio formats for flexible integration with various audio systems.
* External Clock Input: The AD1890JN can accept an external clock input, enabling synchronization with other devices in complex audio systems.
* Control Interface: The device provides a control interface for configuration and monitoring, typically through I²C or SPI, allowing easy communication with the host system for setting parameters or monitoring system performance.

## Mechanical and Package Specifications

* Package Type: The AD1890JN comes in a 20-pin dual in-line package (DIP) or a 20-pin plastic leaded chip carrier (PLCC) package, offering flexibility for integration into various system designs.
* Package Dimensions: The typical package dimensions are 7.62 mm x 10.16 mm for the DIP package, making it suitable for both through-hole and surface-mount applications.
* Pinout and Layout: The pinout is optimized for audio applications, with dedicated pins for audio data input/output, clock input, and control signals.

## Applications

The AD1890JN is designed for use in a variety of professional and consumer audio applications, including:

* Digital Audio Workstations (DAWs): Used in studio equipment for converting audio data between different sample rates, allowing for seamless integration of audio tracks with various sample rates.
* Broadcast Audio Systems: In professional broadcasting systems, the AD1890JN ensures that audio content can be converted to the correct sample rate for transmission or recording.
* Surround Sound Systems: It is used in multi-channel audio systems, ensuring proper sample rate conversion for all channels without introducing distortion or artifacts.
* Consumer Audio Devices: The device can be found in high-end consumer audio products, such as digital music players, home theater systems, and audio interfaces.
* Telecommunications: In digital telephony and other communication systems, the AD1890JN allows for high-quality audio signal conversion between different sample rates, ensuring clarity in voice communications.

## Advanced Features

* Automatic Gain Control (AGC): The device can be used with automatic gain control to ensure consistent output levels, even when the input signal varies.
* De-emphasis Control: The AD1890JN offers de-emphasis functionality, which can be used to apply a high-frequency roll-off during the sample rate conversion, typically for systems that follow older audio standards (e.g., pre-emphasis in CD audio).
* Error Detection and Reporting: The device includes error detection features, providing real-time feedback if any issues arise during the sample rate conversion process, ensuring reliable operation.

## Conclusion

The Analog Devices AD1890JN is a high-performance, feature-rich digital audio sample rate converter ideal for applications requiring precise, transparent audio conversion. With its wide sample rate range, low jitter, and advanced noise shaping capabilities, it ensures high-quality audio output while maintaining low power consumption. Whether used in professional audio equipment, consumer devices, or telecommunications systems, the AD1890JN delivers exceptional performance, making it an essential component for any system requiring accurate sample rate conversion.