AD9851BRSZ

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Interface - Direct Digital Synthesis (DDS) is a very powerful technique for producing analog signals from a digital input. The AD9851BRSZ is one example of an IC featuring DDS, and it is widely used in radio frequency applications. This article will provide an overview of the AD9851BRSZ, discussing application field and working principle.

Application Field

The AD9851BRSZ is a high-resolution monolithic programmable synthesizer capable of producing a frequency range of 4.844 GHz with a 0.1 Hz resolution. It is designed for applications including general frequency synthesis and clock synthesis. This device is suitable for both commercial and military frequency synthesizers due to its compatibility with a wide range of crystals and other frequency sources, making it ideal for radio equipment, communications testing and antenna capability measurements.

The device supports both parallel and serial data interfaces for programmable features. The AD9851BRSZ is capable of outputting two outputs in Quadrature Phase (90°) and single outputs in sine and cosine phases. The device also supports chirp signal generation and amplitude modulation. These are important features for radar and ultrasound applications.

Working Principle

The AD9851BRSZ works by using digital input signals to control the generation of an analog output signal. The device contains a few key components: a phase accumulator, a sine lookup table, a digital-to-analog converter (DAC), and a reference voltage generator. The phase accumulator is the core of the device; it is responsible for the generation of phase and frequency. The phase accumulator works by taking a 32-bit number (called a phase address) and incrementing it step by step. Each step corresponds to a certain change in frequency, and the phase address is updated accordingly. The phase accumulator is also capable of controlling amplitude.

The sine lookup table contains a series of values corresponding to the different possible phase addresses. The DAC takes these values from the sine lookup table and converts them into an analog signal. The reference voltage generator is responsible for setting the level of the output signal based on the amplitude control.

The AD9851BRSZ device is capable of generating an analog signal of high accuracy, power efficiency, and low noise. The DAC provides a high level of precision and low distortion. The device is highly efficient, consuming only 150mW of power. Finally, it offers low noise performance, with a typical phase noise of -120dBc/Hz.

In summary, the AD9851BRSZ is a powerful and versatile IC for producing frequency-controlled analog signals from digital input. With its high resolution and precision, low noise, and power efficiency, it is suitable for a variety of applications, from clock and frequency synthesis to radar and ultrasound. It can be used in both commercial and military equipment, offering a reliable and accurate solution.

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