AD9835BRU

Overview

The AD9835BRU is a Direct Digital Synthesizer (DDS) waveform generator manufactured by Analog Devices Inc. It integrates a numerically controlled oscillator, phase accumulator, COS lookup table, and a 10-bit digital-to-analog converter on a single CMOS chip. The device supports clock rates up to 50 MHz with frequency control accuracy of one part in 4 billion. It operates on a 5 V power supply within an industrial temperature range of −40°C to +85°C. Key specifications include a 10-bit resolution, 50 MSPS update rate, 4 mA full-scale output current, and a signal-to-noise ratio of 50 dB at 1 MHz output. Power consumption is 200 mW during operation and reduces to 1.75 mW in power-down mode.

Feature Summary

• Integrates a 32-bit phase accumulator and COS lookup table for precise frequency and phase modulation capabilities.
• Features a high-impedance 10-bit current-output DAC with adjustable full-scale current via an external resistor.
• Supports serial interface loading for frequency and phase registers with direct and deferred data transfer modes.
• Includes a dedicated power-down option to minimize energy consumption when the device is inactive.

Applications

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

Procurement Notes

Verify the specific suffix BRU indicates the TSSOP-16 package and industrial temperature grade (-40°C to +85°C). Confirm RoHS compliance status as datasheet revisions may alter environmental declarations. Ensure the ordering code matches the exact pinout and thermal characteristics required for the target PCB layout. Cross-reference the manufacturer's latest ordering guide for any discontinued variants or alternate packaging options.

Selection Notes

Select this component for applications requiring a single-chip DDS solution with integrated modulation. Ensure the system design accommodates a 5 V supply and provides a master clock up to 50 MHz. Verify that the load impedance connected to IOUT maintains voltage compliance within the specified range. Consider the 10-bit resolution limits for dynamic range requirements and confirm serial interface timing compatibility with the host microcontroller.

Part Context

The AD9835 belongs to Analog Devices' family of Direct Digital Synthesis devices, designed for generating stable waveforms with high frequency resolution. It serves as a core component in systems requiring precise frequency agility and phase control. The BRU variant specifically denotes the surface-mount TSSOP-16 package suitable for automated assembly processes in compact electronic designs.

Replacement Considerations

The AD9834 offers similar functionality but operates at 75 MHz with a wider voltage range (2.3 V to 5.5 V) and a 20-pin TSSOP package. The AD9832 provides 25 MHz operation with comparable features. Verify pin compatibility and register programming differences before substituting these models.