AD9834BRU

Overview

The AD9834BRU is a complete 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, generating sine and triangular outputs up to 37.5 MHz. It includes a 28-bit frequency register for high resolution and an onboard comparator for square wave generation. Communication is handled via a 3-wire SPI interface supporting clock rates up to 40 MHz. The component is housed in a 20-lead TSSOP package and supports an extended operating temperature range from -40°C to +105°C.

Feature Summary

• Integrated onboard comparator for direct square wave output generation
• Supports independent analog and digital power supplies for flexible system design
• Provides hardware or software control for frequency and phase register switching
• Includes dedicated power-down pins to minimize current consumption when inactive

Applications

• Frequency stimulus and waveform generation
• Low power RF and communications systems
• Liquid and gas flow measurement instrumentation
• Proximity, motion, and defect detection sensors
• Test and medical equipment

Procurement Notes

Verify the specific grade designation required for your application, as performance metrics such as Spurious-Free Dynamic Range vary between B Grade and C Grade versions. Confirm that the 20-lead TSSOP package aligns with your PCB footprint requirements. Ensure that the serial interface timing parameters meet your microcontroller's specifications before finalizing the procurement order.

Selection Notes

Select the AD9834BRU when a low-power DDS solution is needed for frequencies up to 37.5 MHz. Consider the B Grade if narrow-band SFDR greater than 72 dB is critical, whereas the C Grade offers wider bandwidth performance. Verify that the 10-bit resolution meets your signal purity requirements and that the 20-lead TSSOP package fits your assembly constraints.

Part Context

The AD9834BRU belongs to the AD9834 series of Direct Digital Synthesis devices from Analog Devices. This series is designed for applications requiring precise frequency and phase control with minimal power consumption. The BRU suffix indicates the specific 20-lead TSSOP packaging variant suitable for surface-mount assembly.

Replacement Considerations

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