Clock & Timing

AD9833BRUZ

AD9833BRUZ - 25MHz Low Power DDS | Analog Devices

The AD9833BRUZ is a low power, programmable waveform generator from Analog Devices capable of producing sine, triangular, and square wave outputs. It operates from a single 2.5V to 5.5V power supply and supports a maximum serial clock frequency of 25 MHz, enabling precise frequency and phase control in a compact 10-pin MSOP package. The device integrates a complete Direct Digital Synthesis (DDS) system on chip, including a 28-bit phase accumulator, a sine lookup table, and a 10-bit DAC, allowing the generation of high-resolution waveforms with minimal external components. Direct Digital Synthesis (DDS) is a method of generating analog waveforms digitally by accumulating phase increments and mapping them through a lookup table to produce sine, triangular, or square wave outputs. DDS offers advantages over analog oscillators, including precise frequency tuning, fast frequency hopping, and excellent phase continuity. The AD9833 is a member of the DDS family, which falls under the broader category of signal generation ICs used in test equipment, communication systems, and sensor excitation. Key features of the AD9833BRUZ include a 28-bit frequency register providing 0.1 Hz resolution at 25 MHz clock, a 10-bit DAC for amplitude control, and a power-down mode that reduces current consumption to 0.5 mA typical. The device supports both SPI and Microwire serial interfaces, making it easy to interface with microcontrollers. The narrowband SFDR is typically 72 dB, ensuring clean output spectra for frequency synthesis applications. The AD9833 uses a CMOS process, which contributes to its low power consumption of 20 mW at 3V. The internal architecture includes a phase accumulator that can be programmed for frequency and phase modulation, enabling applications such as FSK and PSK. The device also features a reset pin for initialization and a control register for configuring output waveform and power-down modes. Typical applications include frequency excitation for impedance measurements, signal generation for test equipment, and waveform generation for portable instrumentation. The low power and small package make it ideal for battery-powered devices. When designing with the AD9833, ensure proper decoupling on the power supply and use a clean clock source to achieve optimal SFDR performance.