AD9857AST

Overview

The AD9857AST is a CMOS quadrature digital upconverter featuring a 14-bit resolution and a maximum sampling rate of 200 MSPS. It integrates a high-speed direct digital synthesizer (DDS), a high-performance DAC, clock multiplier circuitry, and digital filters within an LQFP-80 package. The device operates on a single 3.3 V power supply and supports serial interface control. It functions as a universal I/Q modulator or agile upconverter for communications applications.

Feature Summary

• Integrates a high-speed direct digital synthesizer with a 14-bit digital-to-analog converter
• Includes clock multiplier circuitry and digital filtering capabilities
• Supports serial interface configuration for system control

Applications

• Universal I/Q modulation in communication systems
• Agile signal upconversion
• Single-tone direct digital synthesis
• Interpolating digital-to-analog conversion

Procurement Notes

Verify the specific suffix 'ASTZ' against official Analog Devices documentation to confirm lead-free status and tape-and-reel or tray packaging details. Ensure compatibility with the required LQFP-80 footprint and 3.3 V logic levels during integration. Cross-reference the datasheet revision history for any updates regarding pinout or electrical characteristics prior to final procurement.

Selection Notes

Select this component when a combined DDS and DAC solution is required for baseband upconversion. The 14-bit resolution and 200 MSPS speed suit moderate bandwidth applications. Consider the integrated clock multiplier if external frequency synthesis components are to be minimized. Verify that the serial interface protocol matches the host controller's available ports.

Part Context

This part belongs to the AD9857 family of quadrature digital upconverters. It serves as a specialized data acquisition and conversion IC designed for complex communication waveforms. The device consolidates multiple signal processing functions into a single chip, reducing board space compared to discrete implementations of DDS and DAC stages.

Replacement Considerations

Consult the Analog Devices product selector guide for alternative parts within the same family or generation. Verify pinout compatibility and electrical parameter equivalence before substituting. No direct public substitute part numbers are confirmed in the provided source material.