MCC USB-2020 Ultra-High-Speed Simultaneous USB Digitizer

Digilent's measurement computing USB-2020 is a high-speed digitizer and features two simultaneous analog inputs, 12-bit resolution, and eight digital I/O. The simultaneous, high-speed analog inputs are sampled at rates up to 20 MS/s per channel. Users can sample data directly to the 64 MS onboard memory or continuously stream data to a host computer. Features include an A/D converter per channel and flexible triggering and gating options. Each channel has its own A/D converter for simultaneous sampling to eliminate channel skew and maintain phase information between channels. Flexible triggering and gating ensure data is acquired when needed. The clock I/O input allows acquisitions to be controlled by the onboard clock or by an external clock source for applications that require user-supplied pacing. The board provides signal connections through four standard BNC connectors and a 40-pin auxiliary connector. Because each channel has an A/D converter, an overall sample rate of 40 MS/s is achieved when sampling both channels. The simultaneous sampling eliminates channel skew and maintains phase coherence between the two channels. The memory buffer can store up to 64 mega samples at the maximum rate for transfer to the computer after the acquisition is complete. Continuous scan mode enables data to be directly transferred to the host computer during acquisition. The maximum rate in continuous scan mode is 8 MS/s for all acquired data (one channel or two channels). The maximum rate achieved depends on the host computer. USB-2020 analog input scanning operations can be paced with the internal A/D clock or with an external clock source. The CLK IO connector can be configured through software for input (default) for external pacing or output to pace a connected device.

The USB-2020 supports software-selectable digital and analog triggers and gates. Digital triggers can be configured for rising or falling edges or high or low levels. Analog triggers can be configured for above or below levels or rising or falling edges with hysteresis. Digital gates can be configured for high or low levels. Analog gates can be configured for software-selectable high or low levels or in or out of windows.

An analog scan can have a trigger or a gate, but not both. For example, users cannot use an analog trigger and simultaneously use the TRIG IN BNC connector to gate. The USB-2020 provides eight digital I/O lines on the 40-pin auxiliary connector. When a bit is configured for input, it can detect the state of any TTL-level input. Each DIO channel is an open-drain and can sink up to 150 mA for direct drive applications when used as an output. The USB-2020 provides four standard BNC connectors for both analog inputs, trigger input, and clock I/O. Use standard BNC cables to connect the BNC female connectors. The board also includes a 40-pin auxiliary connector for the eight digital I/O, two 5 V power outputs, and an alternate trigger input connection. The signals available from the 40-pin auxiliary connector require a separately purchased cable.

Software support includes DAQami, an out-of-the-box application for data logging, visualization, and signal generation. Data can be viewed in real-time or post-acquisition on user-configurable displays. Drivers are included for the most popular applications and programming languages, including Visual C++®, Visual C#®, Visual Basic® .NET, DASYLab®, LabVIEW™, MATLAB®, Linux®, and Python™.