AD9870AST

Overview

The AD9870AST is a general-purpose intermediate frequency (IF) subsystem designed to digitize low-level IF signals within the 10 MHz to 300 MHz range. It supports an input bandwidth of up to 150 kHz and provides serial digital outputs containing 16-bit I and Q data for host processor demodulation. The device integrates the entire IF chain with minimal external components, making it suitable for narrowband radio applications requiring high dynamic range and low power consumption.

Feature Summary

• Integrates complete IF processing chain including analog-to-digital conversion
• Provides serial digital output of 16-bit in-phase and quadrature data
• Accepts IF inputs from 10 MHz to 300 MHz with up to 150 kHz bandwidth

Applications

• Mobile radio systems utilizing superheterodyne architecture
• Narrowband radio applications employing digital modulation schemes
• Base station receiver designs requiring high dynamic range
• Portable user unit equipment prioritizing low power operation

Procurement Notes

Verify the specific package marking and date code against the manufacturer's official documentation to ensure authenticity. Confirm that the component matches the exact AD9870AST designation, as suffixes may indicate variations in temperature grade or packaging format. Request traceability documents and original manufacturer seals to mitigate risks associated with counterfeit integrated circuits during acquisition.

Selection Notes

Select this component for designs requiring a compact solution for narrowband IF digitization without discrete filtering stages. It is appropriate when system architecture demands direct serial I/Q data output for software-defined radio processing. Consider its power consumption profile relative to portable battery-operated constraints and verify compatibility with the host processor's serial interface timing requirements.

Part Context

The AD9870 series represents Analog Devices' approach to simplifying receiver front-end design by consolidating multiple analog functions into a single silicon die. This integration reduces board space and minimizes signal degradation typically caused by interconnect parasitics in traditional multi-chip IF solutions. The AST variant specifically denotes the industrial temperature range and LQFP package configuration.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.