AD9834BRU-REEL

Overview

The AD9834BRU-REEL is a Direct Digital Synthesis (DDS) device manufactured by Analog Devices Inc. It operates on a 2.3 V to 5.5 V power supply and consumes 20 mW at 3 V. The device features a 10-bit DAC with an update rate of 75 MSPS and supports output frequencies up to 37.5 MHz. It includes a 28-bit frequency register for precise tuning, a 3-wire SPI interface operating up to 40 MHz, and an onboard comparator for square wave generation. The component is housed in a 20-lead TSSOP package and functions within an extended temperature range of −40°C to +105°C.

Feature Summary

• Generates high-performance sine and triangular waveforms via a 10-bit current-steering DAC.
• Integrates an onboard comparator to produce square waves for clock generation applications.
• Supports digital phase modulation and frequency modulation through serial register loading and pin toggling.
• Features independent analog and digital power supplies allowing mixed-voltage operation.

Applications

• Frequency stimulus and waveform generation
• Low power RF and communications systems
• Liquid and gas flow measurement
• Test and medical equipment

Procurement Notes

Verify the specific grade (B or C) required for your application, as specifications such as clock speed and dynamic performance vary between them. Confirm that the REEL suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure compatibility with the 20-lead TSSOP footprint during PCB layout planning.

Selection Notes

Select the B Grade variant if the system requires a master clock frequency of 50 MHz. Choose the C Grade variant for designs requiring a 75 MHz master clock input. Consider the external RSET resistor value when configuring the full-scale output current to match load requirements. Verify that the serial interface timing meets the microcontroller's SCLK capabilities.

Part Context

This component belongs to the AD9834 series of low-power DDS devices. It is distinct from the AD9835, which utilizes a 16-lead TSSOP package and operates on a fixed 5 V supply. The AD9834 offers greater flexibility through its wide voltage range and dual power supply capability, making it suitable for portable and battery-operated instrumentation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.