The National Instruments PXI-5431 (Part Number: 777956-01) is a high-performance PXI Video Signal Generator designed for advanced video signal processing applications. Engineered with a 32-bit high-speed accumulator and a 12-bit digital-to-analog converter (DAC), it employs Direct Digital Synthesis (DDS) technology to achieve precise waveform generation. The PXI-5431 supports a DDS mode that enables users to control frequency generation with high accuracy and temperature stability, facilitating fast and phase-coherent frequency transitions. Users can define a staging list to perform frequency hops and sweeps, with the entire listing processed via a single buffer loader into the query memory to ensure consistent signal output.

The SYNC output provides a TTL representation of the generated sine waveform, routed through a pre-amplifier and comparator, integrating a hysteresis buffer and a 50 Ω termination resistor to mitigate reflected pulses. The device can accommodate a DC offset of up to ±2.5 V prior to the attenuation chain. It is important to note that when the gain is below 1.58 V or the amplitude falls under 3.16 V peak-to-peak, the internal 10-dB attenuator is engaged. Beyond these limits, the total waveform amplitude—including DC offset—should not exceed ±5 V into a 50 Ω environment to prevent signal clipping.

The PXI-5431 features a single video channel, an update rate of 20 MS/s, and delivers a frequency range of up to 8 MHz. With a resolution of 12 bits, this generator is equipped to meet the demands of high-fidelity digital signal applications. A comprehensive user and maintenance manual are readily available for download, and inquires regarding pricing should be directed to a National Instruments sales representative. The product is supported by a warranty of 2 to 3 years, ensuring reliable operation and satisfaction.