AD1893JST

Overview

The AD1893JST is a fully digital, stereo asynchronous sample rate converter (ASRC) designed for 16-bit low-cost applications. It operates on a single +3 V to +5.5 V supply and supports input/output sample clock frequencies from 8 kHz to 56 kHz with ratios between approximately 1:2 and 2:1. The device features a dynamic range of 96 dB and total harmonic distortion plus noise of -96 dB at 1 kHz. It includes an on-chip oscillator requiring only an external crystal, flexible four-wire serial interfaces, and selectable slow/fast settling modes for jitter rejection or rapid rate changes.

Feature Summary

• Automatically senses sample frequencies without programming
• Rejects sample clock jitter through digital servo control loop
• Accommodates dynamically changing asynchronous sample clocks
• Includes on-chip oscillator and power-down mode

Applications

• Consumer CD-R, DAT, DCC, MD and 8 mm Video Tape Recorders
• Digital Audio Communication/Network Systems
• Computer Multimedia Systems

Procurement Notes

Verify the specific ordering suffix JST corresponds to the LQFP package option when sourcing components. Confirm that the temperature range meets operational requirements, as this variant is specified for 0 °C to +70 °C. Ensure proper electrostatic discharge precautions are implemented during handling due to the sensitivity of the CMOS process used in fabrication.

Selection Notes

Select the AD1893JST for battery-powered digital audio equipment requiring low voltage operation. This model is suitable where automatic sample rate sensing eliminates the need for explicit frequency programming. Consider the LQFP package dimensions if board space is constrained compared to the PDIP alternative.

Part Context

The AD1893 belongs to the Analog Devices SamplePort family of asynchronous sample rate converters. It shares functional similarities with the AD1890 and AD1891 models but is optimized for 16-bit non-varispeed applications. The JST suffix specifically denotes the 44-lead LQFP package variant within this product line.

Replacement Considerations

The AD1893JN serves as a direct pin-compatible replacement offering the same functionality in a Plastic DIP package.