AD9850BRSZ-REEL

Overview

The AD9850BRSZ-REEL is a complete Direct Digital Synthesis (DDS) frequency synthesizer manufactured by Analog Devices Inc. It integrates a high-speed 10-bit DAC and a comparator to generate spectrally pure sine waves or agile square wave clocks. The device features a 32-bit frequency tuning word, providing a resolution of 0.0291 Hz with a 125 MHz reference clock. It supports operation at up to 125 MHz clock rates and generates output frequencies up to half the reference clock frequency. The component operates on a single 3.3 V or 5 V supply, consumes as little as 155 mW, and is housed in a 28-lead SSOP package.

Feature Summary

• Integrates a high-performance 10-bit digital-to-analog converter and a high-speed comparator for direct analog and square wave outputs.
• Provides digitally programmable frequency synthesis with a 32-bit tuning word for precise frequency control.
• Supports simplified data loading via parallel byte or serial interface formats.
• Includes five bits of digitally controlled phase modulation capability.

Applications

• Frequency/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 that the specific ordering suffix -REEL corresponds to the reel packaging format required for automated assembly processes. Confirm that the component meets RoHS standards if environmental compliance is mandatory for the target application. Ensure the procurement channel sources genuine Analog Devices products to avoid counterfeit components.

Selection Notes

Select this component when a highly integrated DDS solution is required for generating precise frequency signals. Consider the 125 MHz maximum clock rate and 10-bit DAC resolution against system requirements. Evaluate power consumption constraints, noting the difference between 3.3 V and 5 V supply operation. Verify compatibility with available serial or parallel control interfaces.

Part Context

This part belongs to the AD9850 series of complete DDS synthesizers from Analog Devices. It shares core architectural features with other variants in the family but is distinguished by its specific packaging and reel configuration. The device represents a CMOS implementation designed for low power dissipation and high performance in compact form factors.

Replacement Considerations

The AD9850BRS is a non-RoHS equivalent within the same package type. The AD9850BRSZ is the lead-free version in tube packaging. No alternative functional substitutes are documented in the provided source material.

FAQ

What is the output frequency resolution of the AD9850?

With a 125 MHz reference clock input, the AD9850 provides an output tuning resolution of 0.0291 Hz due to its 32-bit frequency tuning word.

How is the AD9850 programmed?

The device can be programmed using either a parallel byte loading format, which involves five iterative loads of an 8-bit control word, or a serial loading format via a 40-bit serial data stream.

Can the AD9850 function as a clock generator?

Yes, the internal high-speed comparator can be configured to accept the filtered output of the DAC to generate a low jitter square wave output suitable for agile clock generator applications.