The National Instruments PCI-5640 is an advanced intermediate frequency (IF) transceiver designed for high-performance signal processing applications. It features dual input and output channels, supporting a maximum real-time bandwidth of 20 MHz, with 14-bit analog-to-digital (A/D) and digital-to-analog (D/A) converters. The PCI-5640 facilitates digital down-conversion and digital up-conversion, making it suitable for various software-defined radio applications. It utilizes a Xilinx Virtex-II Pro-P30 FPGA for inline processing, and incorporates a direct memory access (DMA) feature for efficient data streaming. Operating within a frequency range of 250 kHz for analog input/output, this device is compatible with the NI-5640 driver software and LabVIEW, enabling flexible programming using either FPGA or host processing environments. The PCI-5640 is designed for installation in desktop computers running Windows operating systems, consuming 20 to 25.5 W of power. Although the PCI-5640 has been announced as obsolete, it remains available for purchase and repair through Apex Waves. Dimensions are 13.4 × 0.8 × 4.4 inches, and it weighs 9.2 ounces. A user manual and maintenance manual are available for download, and pricing can be obtained by contacting a sales representative.