AD1893JSTZ

Overview

The AD1893JSTZ is a fully digital, stereo asynchronous sample rate converter (ASRC) from the SamplePort family. It operates on a single +2.7 V to +5.5 V supply and features an on-chip oscillator requiring only an external crystal. The device automatically senses input and output sample clock frequencies ranging from 8 kHz to 56 kHz, supporting ratios between approximately 1:2 and 2:1 without programming. It provides 96 dB dynamic range and -96 dB THD+N at 1 kHz. Packaged in a 44-lead LQFP, it includes flexible four-wire serial interfaces and power-down modes for low-power applications.

Feature Summary

• Fully digital stereo ASRC with automatic sample frequency sensing
• On-chip oscillator with external crystal support (16 MHz nominal)
• 96 dB dynamic range and -96 dB THD+N performance
• Flexible serial interface with configurable data justification

Applications

• Consumer CD-R, DAT, DCC, MD, and 8 mm video tape recorders
• Digital audio communication and network systems
• Computer multimedia systems

Procurement Notes

Verify the specific suffix JSTZ corresponds to the 44-LQFP package and 0°C to +70°C temperature range as defined in the ordering guide. Confirm availability status, as distribution channels may list this component as obsolete or limited stock. Ensure ESD precautions are observed during handling due to the CMOS process sensitivity.

Selection Notes

Select the AD1893JSTZ for 16-bit low-cost, non-varispeed digital audio applications requiring battery operation. Choose the slow-settling mode for optimal jitter rejection and signal quality, or fast-settling mode for rapid sample rate changes. Ensure the system design accommodates the 700 ms group delay and FIFO management to prevent underflow/overflow mute events.

Part Context

The AD1893 is part of Analog Devices' SamplePort family, designed to solve sample rate interfacing problems in digital audio equipment. It uses multirate digital signal processing to interpolate input data to a high internal rate and decimate to the desired output rate. This approach allows for arbitrary frequency relationships between input and output clocks without integer ratio constraints.

Replacement Considerations

Consult the AD1890/AD1891 datasheet for other products in the SamplePort family that may offer alternative pinouts or feature sets. Verify compatibility with existing PCB footprints and software configurations when considering cross-model substitutions within the same product line.