AD9850BRS

Overview

The AD9850BRS is a complete Direct Digital Synthesis (DDS) frequency synthesizer manufactured by Analog Devices Inc. in a 28-lead SSOP package. It integrates a high-speed DDS core, a 10-bit DAC, and a comparator to generate programmable sine or square waves. The device supports a maximum reference clock of 125 MHz at 5 V supply, enabling an output frequency up to 62.5 MHz with a resolution of 0.0291 Hz. It operates on a single 3.3 V or 5 V supply, consuming 155 mW at 3.3 V/110 MHz and 380 mW at 5 V/125 MHz. The industrial temperature range is -40°C to +85°C.

Feature Summary

• Integrates a 32-bit frequency tuning word for precise digital frequency control.
• Includes a high-performance 10-bit DAC and a high-speed comparator for analog output generation.
• Supports both parallel byte loading and serial data stream programming interfaces.
• Provides five bits of digitally controlled phase modulation capability.

Applications

• Frequency and phase agile sine wave synthesis
• Clock recovery and locking circuitry for digital communications
• Digitally controlled ADC encode generator
• Agile local oscillator applications

Procurement Notes

Verify the specific suffix 'BRS' indicates the standard SSOP-28 package variant without lead-free certification, distinct from the 'BRSZ' Pb-free version. Confirm availability status as this component may be subject to discontinuation notices. Ensure the ordering documentation matches the exact manufacturer part number to avoid confusion with reel-packaged equivalents.

Selection Notes

Select this component when a complete, low-power DDS solution is required for generating spectrally pure signals. Consider the 10-bit DAC resolution and SFDR specifications against application noise requirements. Verify that the 28-lead SSOP package fits the PCB layout constraints and that the operating voltage aligns with the 3.3 V or 5 V system design.

Part Context

The AD9850BRS belongs to the AD9850 series of CMOS DDS synthesizers. It shares the same functional architecture and pinout with other variants like the AD9850BRS-REEL and AD9850BRSZ, differing primarily in packaging quantity and lead-free compliance. It serves as a foundational component for direct digital frequency synthesis systems requiring high agility and precision.

Replacement Considerations

The AD9850BRSZ is a verified lead-free equivalent with identical electrical characteristics and pinout. The AD9850BRS-REEL offers the same functionality in a tape-and-reel format. No alternative functional substitutes are confirmed in the provided documentation.