AD1891JN

Overview

The AD1891JN is a fully digital, stereo Asynchronous Sample Rate Converter (ASRC) designed for 16-bit lower cost applications. It interpolates input data to an internal high sample rate with 300 ps time resolution before decimating to the desired output rate. The device supports input word widths of 4 to 16 bits and produces a 24-bit output. It operates from a +5 V supply over a commercial temperature range of 0°C to +70°C. Key performance metrics include a dynamic range of 96 dB and a Total Harmonic Distortion plus Noise (THD+N) of -94 dB at full-scale input.

Feature Summary

• Automatically senses sample frequencies without programming
• Tolerant of sample clock jitter with smooth transitions during frequency crossings
• Features short group delay mode only
• Includes automatic output mute functionality

Applications

• Digital Mixing Consoles and Digital Audio Workstations
• CD-R, DAT, DCC and MD Recorders
• Multitrack Digital Audio and Video Tape Recorders
• Studio to Transmitter Links
• Computer Communication and Multimedia Systems

Procurement Notes

Verify the specific ordering suffix JN corresponds to the Plastic DIP N-28 package option when sourcing components. Confirm that the application requirements align with the AD1891's 16-bit input specification rather than the higher-performance AD1890 variant. Ensure proper ESD precautions are implemented during handling due to the device's sensitivity to electrostatic discharge.

Selection Notes

Select the AD1891JN for applications requiring 16-bit audio processing where large dynamic sample-rate changes are not encountered. This model is suitable for lower-cost implementations compared to the AD1890. Note that this device lacks the long group delay mode available in the AD1890, limiting its suitability for varispeed applications requiring extended buffer depths.

Part Context

The AD1891 is part of the Analog Devices SamplePort family of stereo asynchronous sample rate converters. It shares the same core architecture and interface capabilities as the AD1890 but is optimized for 16-bit applications. Both devices utilize multirate digital signal processing techniques to resolve sample rate interfacing problems in digital audio equipment.

Replacement Considerations

The AD1890JN serves as a direct pin-compatible alternative offering higher dynamic range and 20-bit input support. Substitution requires verifying if the increased performance justifies potential cost differences or if the AD1891's limited group delay mode is sufficient for the target application.