Overview
The AD1890JP-REEL, produced by Analog Devices Inc., is a SamplePort Stereo Asynchronous Sample Rate Converter (ASRC) designed to solve sample rate interfacing and compatibility problems in digital audio equipment. This device is particularly suited for 18- and 20-bit professional applications, offering high-quality sample rate conversion without the need for explicit programming of input and output sample clock frequencies. The AD1890 automatically senses the relationship between the input and output sample clocks, allowing for flexible interfacing with various DSP chips, AES/EBU receivers and transmitters, and I2S compatible devices.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Input Sample Clock Frequency | 8 kHz to 56 kHz | |
| Output Sample Clock Frequency | 8 kHz to 56 kHz | |
| Input Word Width | 4 to 20 bits | |
| Output Word Width | 24 bits | |
| Supply Voltage (VDD) | 2.7 to 5.5 | V |
| Operating Current (IDD) at VDD = 5.0 V | 35 to 40 | mA |
| Operating Current (IDD) at VDD = 3.0 V | 19 | mA |
| Operating Temperature Range | 0 to +70 | °C |
| Storage Temperature Range | –40 to +85 | °C |
| Package Type | 28-Lead PLCC |
Key Features
- Asynchronous Sample Rate Conversion: The AD1890JP-REEL can handle arbitrary frequency and phase relationships between input and output sample clocks, eliminating the need for explicit programming.
- Flexible Interfacing: Supports interfacing with DSP chips, AES/EBU receivers and transmitters, and I2S compatible devices with independent data justification and delay options.
- High-Quality Signal Processing: Uses multirate digital signal processing techniques with 22-bit coefficients and 27-bit accumulation, ensuring high-quality output signals.
- Settling Modes: Offers slow-settling and fast-settling modes to adapt to changes in sample clock frequencies, with the slow-settling mode providing the best signal quality and jitter rejection.
- Group Delay Options: Features pin-selectable short or long group delay modes, affecting the depth of the FIFO memory that buffers input data samples.
Applications
- Professional Digital Audio Equipment: Ideal for high-end audio applications requiring precise sample rate conversion, such as professional audio mixers, routers, and digital audio workstations.
- AES/EBU and I2S Systems: Compatible with AES/EBU receivers and transmitters, as well as I2S devices, making it versatile for various digital audio systems.
- DSP and Audio Processing Systems: Suitable for integration with DSP chips to handle complex audio processing tasks.
Q & A
- What is the primary function of the AD1890JP-REEL?
The primary function is to perform asynchronous sample rate conversion in digital audio equipment, solving sample rate interfacing and compatibility issues.
- What are the input and output sample clock frequency ranges for the AD1890JP-REEL?
The input and output sample clock frequencies can range from 8 kHz to 56 kHz.
- What are the input and output word widths for the AD1890JP-REEL?
The input word width is 4 to 20 bits, and the output word width is 24 bits.
- What is the operating temperature range for the AD1890JP-REEL?
The operating temperature range is from 0°C to +70°C.
- What package type is the AD1890JP-REEL available in?
The AD1890JP-REEL is available in a 28-Lead PLCC package.
- Does the AD1890JP-REEL support flexible interfacing with other devices?
Yes, it supports flexible interfacing with DSP chips, AES/EBU receivers and transmitters, and I2S compatible devices.
- What are the settling modes available for the AD1890JP-REEL?
The device offers slow-settling and fast-settling modes to adapt to changes in sample clock frequencies.
- What is the purpose of the group delay modes in the AD1890JP-REEL?
The group delay modes determine the depth of the FIFO memory that buffers input data samples, with options for short or long group delay.
- What is the typical operating current for the AD1890JP-REEL at VDD = 5.0 V?
The typical operating current is 35 to 40 mA at VDD = 5.0 V.
- Is the AD1890JP-REEL suitable for professional audio applications?
Yes, it is designed for 18- and 20-bit professional applications, ensuring high-quality sample rate conversion.
