AD9852AST

Overview

The AD9852ASTZ is a CMOS digital synthesizer featuring a 300 MHz internal clock rate and dual integrated 12-bit D/A converters. It supports FSK, BPSK, PSK, chirp, and AM operations with an ultrahigh-speed comparator exhibiting 3 ps rms jitter. The device provides excellent dynamic performance, achieving 80 dB SFDR at 100 MHz output. It includes a 4× to 20× programmable reference clock multiplier, dual 48-bit frequency registers, and dual 14-bit phase offset registers. Control interfaces include a 10 MHz serial SPI-compatible port or 100 MHz parallel programming. The component operates on a single 3.3 V supply within the extended industrial temperature range of −40°C to +85°C.

Feature Summary

• Supports multiple modulation modes including FSK, BPSK, PSK, chirp, and AM via dedicated pins or I/O interface.
• Integrates dual 12-bit DACs and a high-speed comparator for agile clock generation and precise waveform synthesis.
• Features a programmable reference clock multiplier allowing system clock generation from lower frequency external references.
• Provides flexible control through simplified 2-wire/3-wire serial or high-speed parallel programming interfaces.

Applications

• Agile local oscillator frequency synthesis in communication systems
• Programmable clock generator applications requiring low jitter
• FM chirp source generation for radar and scanning systems
• Test and measurement equipment signal sources

Procurement Notes

Verify the specific suffix 'AST' against the manufacturer's current ordering guide to confirm package type and temperature rating. Ensure the design accounts for thermal dissipation requirements associated with the LQFP or TQFP package options. Confirm that the selected variant matches the required maximum clock frequency specifications for the intended application environment.

Selection Notes

Select the AD9852ASTZ when a maximum internal clock frequency of 200 MHz is sufficient, as opposed to the 300 MHz capability of the ASVZ variant. Evaluate the need for differential versus single-ended reference clock inputs based on system noise requirements. Consider the power consumption profiles across different functional configurations to ensure compliance with thermal constraints in the final enclosure design.

Part Context

The AD9852 is pin-for-pin compatible with the AD9854 single-tone synthesizer, facilitating direct upgrades or design modifications between the two devices. It utilizes advanced 0.35 μm CMOS technology to integrate complex DDS functionality onto a single chip. The device serves as a complete digitally programmable synthesizer solution, replacing discrete frequency synthesis components in modern RF designs.

Replacement Considerations

The AD9852ASVZ is a confirmed substitute offering a higher maximum clock frequency of 300 MHz compared to the 200 MHz limit of the ASTZ variant. Both parts share identical pinouts and functional compatibility. Designers must verify that the increased clock speed capabilities align with their thermal management and power supply requirements.