National Instruments PXI-5690

The National Instruments PXI-5690 is a high-performance PXI RF Amplifier designed for applications requiring a programmable dual-channel solution with a frequency range from 100 kHz to 3.0 GHz. This 3U, single-slot PXI module features both fixed gain and configurable gain settings, enhancing the dynamic range and sensitivity of connected PXI RF Signal Vector Analyzers, such as the NI PXI-5660. The PXI-5690 can automatically bypass its gain stage when configured with a direct path, facilitating improved testing performance in monitoring both weak and strong signals.

The amplifier comprises two channels, where Channel 0 serves as a fixed gain preamplifier with a 30 dB gain, delivering low noise figures and a flat frequency response ideal for conventional fixed gain applications. In contrast, Channel 1 operates as a programmable preamplifier, featuring a primary path that provides fixed gain enhancement alongside a user-configurable step attenuator, adjustable in 1 dB increments for output gain settings that range from -10 dB to +20 dB. The direct path allows for bypassing the attenuation and amplification circuitry, making it suitable for accommodating higher power signals without introducing distortion.

Constructed for reliability, the PXI-5690 operates effectively within a temperature range of 0 to 55 °C and is supported by a robust warranty of three years. It is equipped with SMA female connectors on the front panel for easy integration within RF systems. Although no longer available directly from National Instruments, Apex Waves offers this product for purchase and repair, ensuring continued support for your automation and control projects. User manuals and maintenance guides for the PXI-5690 are available for download, and interested purchasers can contact a sales representative for pricing information.