AD9854ASVZ

Overview

The AD9854ASVZ is a CMOS 300 MSPS quadrature complete DDS synthesizer from Analog Devices. It integrates two internal high-speed 12-bit DACs and a 48-bit frequency accumulator to generate programmable I/Q sine and cosine outputs. The device supports a maximum system clock of 300 MHz, enabling output frequencies up to 150 MHz. Key specifications include dual 48-bit frequency registers, dual 14-bit phase offset registers, and a 12-bit amplitude modulation function. It operates on a single 3.3 V supply within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Generates agile quadrature local oscillator signals with digitally programmable frequency, phase, and amplitude.
• Supports multiple digital modulation schemes including FSK, BPSK, PSK, AM, and linear/nonlinear FM chirp.
• Features an ultrahigh-speed comparator for square wave generation with low jitter characteristics.
• Includes a programmable reference clock multiplier (4x to 20x) to derive the internal system clock.

Applications

• Agile quadrature LO frequency synthesis in communication systems
• Programmable clock generators with low jitter requirements
• FM chirp source generation for radar and scanning systems
• Test and measurement equipment signal sources

Procurement Notes

Verify the specific suffix ASVZ corresponds to the 300 MHz operational variant when sourcing components. Confirm that the package includes the exposed thermal pad required for proper heat dissipation. Ensure the supplier provides documentation confirming compliance with the RoHS directive as specified in the manufacturer's ordering guide.

Selection Notes

Select this component for applications requiring simultaneous I/Q output generation with high spectral purity. The AD9854ASVZ is distinguished by its 300 MHz maximum clock rate compared to lower-frequency variants. Consider the power dissipation limits when operating at full clock speeds and ensure adequate PCB thermal management is implemented for the TQFP-80 package.

Part Context

This part belongs to the AD9854 family of direct digital synthesizers. The ASVZ suffix denotes the version optimized for a 300 MHz internal system clock rate. It is pin-for-pin compatible with the AD9852 single-tone synthesizer but offers enhanced quadrature capabilities. The device utilizes advanced 0.35 µm CMOS technology to achieve high functionality on a single supply voltage.

Replacement Considerations

The AD9854ASTZ is a verified substitute part number within the same family, offering a 200 MHz maximum clock rate. Verify that the reduced clock speed meets the application's frequency requirements before substitution.