Waveform 3 Click is a compact add-on board that represents a high-performance signal generator. This board features the AD9837, a low-power programmable waveform generator capable of producing sine, triangular, and square wave outputs from Analog Devices. This direct digital synthesizer creates arbitrary analog waveforms from a fixed-frequency reference clock. It has software programmable output frequency and phase via a 3-wire SPI serial interface and is compatible with DSP standards. This Click board™ is suitable for waveform generation required in various sensing, actuation, and time domain reflectometry (TDR) applications.
Waveform 3 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
Waveform 3 Click, as its foundation, uses the AD9837, a fully integrated direct digital synthesis (DDS) device capable of producing high-performance sine and triangular wave outputs from Analog Devices. It also has an internal comparator that allows the creation of a square wave for clock generation. With 28-bits wide frequency registers, the output frequency and phase are software programmable allowing easy tuning. The AD9837 is fully capable of a broad range of complex and straightforward modulation schemes fully implemented in the digital domain, allowing the accurate and precise realization of complex modulation algorithms using DSP techniques.
The internal circuitry of the AD9837 consists of a numerically controlled oscillator (NCO), frequency and phase modulators, SIN ROM, a DAC, a comparator, and a regulator. Also, it has a high-performance, onboard 16MHz trimmed general oscillator that can serve as the controller clock for the AD9837 achieving a resolution of 0.06Hz.
The AD9837 offers a variety of outputs available from an onboard output SMA connector. The various output options (sine, triangular, and square wave) available from the AD9837 make this Click board™ suitable for a wide variety of applications, including modulation applications. It is also ideal for signal generator applications, and with its low current consumption, it is also suitable for applications in which it can serve as a local oscillator.
The Waveform 3 Click communicates with MCU using the 3-Wire SPI serial interface compatible with standard SPI, QSPI™, MICROWIRE™, DSP interface standards, and operates at clock rates up to 40MHz. Besides, it possesses additional functionality such as a programmable Sleep function that allows external control of the Power-Down mode and Reset function, which resets the appropriate internal registers to 0 to provide an analog output of mid-scale. It is essential to remind that the reset function does not reset the phase, frequency, or control registers.
This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
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