RFSoC Data Capture Cards:
RFX-8440 and RFX-8441

Acquire | Process | Act

Multi-channel Direct RF Sampling on a Single Chip

With flexibility to serve applications like 5G, RADAR, test & measurement and satellite communications, BittWare’s RFX-8440 and RFX-8441 cards feature the latest third-generation RFSoC UltraScale+ Zynq device from Xilinx.

4 Channel Analog In/Out

Tapping three decades of experience in designing sensor processing cards, BittWare’s analog front-end features variable gain in/out down to -40 dBm and several analog front end options.

Do More in the Digital Domain

At the center of both the RFX-8440 and RFX-8441 is the latest generation single-chip RFSoC from Xilinx, the Zynq ZU43. This device is designed to bring together multi-channel data conversion and processing on a single chip.

"Now with complete coverage of sub-6GHz spectrum bands available as a readily-deployable PCIe card from BittWare, customers are able to gain a competitive advantage by accelerating the design and development of their next-gen wireless systems today."
David Brubaker
Senior product line manager, Wired and Wireless Group, Xilinx

RFX-8440 PCIe card, show with optional dual QSFP28s. Card is designed to work in a host system or standalone.

Analog Front End Options

The default configuration for the analog front end targets L-band (1GHz to 2GHz). We also offer other configurations that remove several stages to provide a direct connection with baluns supporting up to 4 GHz. Contact us for other options.

Option 1: L-Band

This option includes several signal conditioning components including variable gain.

L-Band Frequency Response

Option 2: Direct 3 GHz Balun

This option eliminates amplifier distortion and the L-band signal conditioning.

Option 3: Direct 4 GHz Balun

Similar to Option 2, but with an extended input range to 4 GHz.

Flexible 4 Channel Analog In/Out

With features like variable gain down to -40 dBm (input), we’ve designed the critical analog circuitry to match the performance needs for a clean signal to/from the RFSoC’s 14-bit interfaces. Our heritage in high-performance analog PCB design spans three decades as a core strength for BittWare.

Powered by Third-Generation Xilinx Zynq UltraScale+ RFSoC

At the heart of the RFX-8440/RFX-8441 cards is the Zynq ZU43 RFSoC: a powerful single-chip adaptable radio platform providing up to 6 GHz of direct RF sampling. With a multi-element processing system: FPGA, real-time dual-core ARM and a second quad-core ARM, this RFSoC has what it takes to acquire, process and act on RF signals.

Tap a slide for more details on the RFSoC from Xilinx:

Slide content copyright Xilinx

Digital I/O

Expansion Options With up to 200 Gb/s Bandwidth

Getting digital data to/from the RFSoC is easy with the flexibility of many digital I/O options. Choose from the RFX-8440 with an OCuLink 8× 25 Gb/s interface or the RFX-8441 with PCIe Gen4 x8. 

With these options you can connector to NVMe storage (perhaps using our Data Recorder IP), other BittWare FPGA cards for further processing, a CPU host, or let us design a custom interface card for your need. The RFX-8440 can be ordered with the OCuLink connected to dual QSFP28s for interfacing with external systems.

RFX-8440: Using OCuLink to Connect to Other Cards for Further Processing
RFX 8440: Optional Card Configuration with Dual QSFP28s
RFX-8441: Card equipped with PCIe Gen4 x8 to host

Block Diagram, Data Sheet and Specifications


shown with optional dual QSFPs

Board Specifications


  • Zynq UltraScale+ RFSoC
    • XCZU43 in an E1156 package
    • Core speed grade -2
  • Contact BittWare for other FPGA options


  • Several analog configurations available:
    • L-Band 1GHz - 2GHz: Includes several signal conditioning components including variable gain
    • Direct 3 GHz Balun: Eliminates amplifier distortion and the L-band signal conditioning
    • Direct 4 GHz Balun: Similar to 3GHz option, but with an extended input range to 4 GHz
    • Contact BittWare for additional options
  • 4 x 5 GSPS 14-bit ADCs
    • -40 to 0 dBm (default, L-band only)
  • 4 x 10 GSPS 14-bit DACs
    • -40 to 0 dBm (default)
  • Programmable clocks
  • External reference and triggers
  • SSMC style connectors

On-board flash

  • Flash memory for booting FPGA
  • Flash memory for ARM bootloader and OS image

External memory

  • 16GB DDR4 processing system (ARM) memory with ECC
  • 8GB DDR4 programmable logic memory with ECC

RFX-8440 External digital interfaces

  • Processing system
    • PCIe Gen2 x1
    • RJ45 Ethernet
    • USB UART
    • USB 3.0
    • Mini DisplayPort
  • Programmable logic
    • Up to 200 Gb/s via:
      • Option 1: inboard OCuLink
      • Option 2: Front panel 2x QSFP28
    • Xilinx Hard IP support for dual 100GbE and PCIe Gen4

RFX-8441 External digital interfaces

  • Processing system
    • RJ45 Ethernet
    • USB UART
    • USB 3.0
    • Mini DisplayPort
  • Programmable logic
    • PCIe x8 electrical with Xilinx Hard IP support for PCIe Gen4


  • Standard: double-width passive heatsink
  • Contact BittWare for other cooling options


  • On-board power derived from 6-pin AUX connector or optionally from 12V PCIe slot connection
  • Power dissipation is application dependent
  • Typical max power consumption 50W


  • Operating temperature: 5°C to 35°C


  • Manufactured to ISO9001:2015 IPC-A-610-Class III
  • RoHS compliant
  • CE, FCC & ICES approvals

Form factor

  • 3/4-length, standard-height PCIe dual-slot card (x16 mechanical)
  • Supports standalone operation
  • RFX-8440 and RFX-8441 can be ordered as a TeraBox™ integrated server platform

Development Tools

FPGA development

  • BittWare provides a basic data capture and replay example utilizing the major interfaces of the product. Xilinx Vivado development tools are fully supported for development of custom designs.


  • RFX-8440 or RFX-8441 Analog Data Acquisition Card
  • Data capture and relay example - Full source code
  • 1-year hardware warranty

Interested in Pricing or More Information?

Our technical sales team is ready to provide availability and configuration information, or answer your technical questions.