AD1890JP-REEL

Overview

The AD1890JP-REEL is a stereo asynchronous sample rate converter (ASRC) in a 28-pin PLCC package. It performs digital interpolation and decimation to convert input sample rates between 8 kHz and 56 kHz with ratios from 1:2 to 2:1. The device features automatic frequency sensing, requiring no programming for clock configuration. It supports input word widths of 4 to 20 bits and produces a 24-bit output. Key performance metrics include a dynamic range of 120 dB and -106 dB THD+N at 1 kHz for the AD1890 variant. The component operates on a single +5 V supply and includes flexible serial interface control signals.

Feature Summary

• Automatic sensing of input and output sample clock frequencies without explicit programming
• On-chip digital coefficients equivalent to 4 million 22-bit FIR filter coefficients
• Pin-selectable slow-settling or fast-settling modes for jitter rejection and dynamic tracking
• Independent configuration of input and output data justification and bit clock polarity

Applications

• Digital mixing consoles and digital audio workstations
• CD-R, DAT, DCC, and MD 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 against the manufacturer's current documentation to confirm package type and temperature range. Ensure that any reel packaging designation matches the required quantity specifications for your production line. Cross-reference the part number with official distributor catalogs to confirm availability and compliance status prior to purchase.

Selection Notes

Select the AD1890 variant for professional applications requiring 18- or 20-bit resolution and high dynamic range. Choose the AD1891 for lower-cost applications where 16-bit resolution is sufficient and large dynamic sample-rate changes are not expected. Consider the group delay mode requirements when selecting between variants, as the AD1891 lacks the long group delay option available in the AD1890.

Part Context

The AD1890/AD1891 SamplePort series consists of fully digital stereo asynchronous sample rate converters designed to resolve sample rate interfacing issues in digital audio equipment. These devices utilize multirate digital signal processing techniques to interpolate input data to a high internal rate before decimating it to the desired output rate, ensuring compatibility between different digital audio standards.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.