AD1890JPZ

Overview

The AD1890JPZ is a fully digital, stereo Asynchronous Sample Rate Converter (ASRC) designed for professional audio applications. It operates on a single +5 V supply and supports input word widths of 4 to 20 bits, producing a 24-bit output. The device automatically senses sample frequencies ranging from 8 kHz to 56 kHz with ratios between 1:2 and 2:1. Key performance metrics include a dynamic range of 120 dB and –106 dB THD+N at 1 kHz. It features flexible four-wire serial interfaces, low power consumption, and internal FIR filter coefficients equivalent to 4 million 22-bit taps.

Feature Summary

• Automatically senses sample frequencies without programming
• Tolerant of sample clock jitter with smooth transitions during frequency crossings
• Supports dynamically changing asynchronous sample clocks
• Includes short/long group delay modes and slow/fast settling modes

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 and digital audio broadcast equipment
• High quality D/A converters and digital tape recorder varispeed applications

Procurement Notes

Verify the specific ordering suffix JPZ corresponds to the PLCC-28 package option when sourcing components. Confirm that the temperature range matches the required operational environment, as specifications are guaranteed over 0°C to +70°C. Ensure proper ESD precautions are observed during handling due to the sensitivity of the CMOS process used in fabrication.

Selection Notes

Select the AD1890JPZ for professional applications requiring 18- or 20-bit resolution where large dynamic sample-rate changes may occur. Choose this model over the AD1891 if long group delay mode is needed for varispeed tracking. Verify that the system design accommodates the 28-pin PLCC package dimensions and provides the necessary master clock frequency within the 8 MHz to 20 MHz range.

Part Context

The AD1890 is part of Analog Devices' SamplePort family of stereo asynchronous sample rate converters. It shares functional similarities with the AD1891 but offers higher bit-depth support and additional configuration options like selectable group delay modes. This component addresses sample rate interfacing problems in digital audio equipment by interpolating input data to a high internal rate before decimating to the desired output rate.

Replacement Considerations

The AD1891 is a related model within the same family but is intended for 16-bit lower cost applications and lacks the long group delay mode found in the AD1890.