Term Definition
Sample frequency

The frequency at which the device is acquiring samples - the frequency of the clock used to sample data. Measured in Hz (kHz, MHz, GHz).

Sample rate and number of channels

(–2A, –2C, –1X, –4A, –4C, –2X)

The sample rate and channels combinations are there to meet various measurement situations.

The ADQ14 is available in non-interleaved version (500 MSPS and 1000 MSPS) and in interleaved version (2000 MSPS). The interleaving performance is enhanced by SP Devices’ proprietary technologies for interleaving, DBS and ADX1. ADQ14 is available with 1, 2 or 4 channels depending on the selected sample rate.

Sample skip

Sample skip means that samples are discarded to lower the effective sample rate. (Notice the difference to decimation, where the signal filtered before samples are discarded).

Sampling Rate

An A/D converter converts an analog signal into a stream of digital numbers, each representing the analog signal's amplitude at a moment in time. Each number is called a "sample." The number sample per second is called the sampling rate, measured in samples per second.

SDK

Is the distributable containing API, Documentation, Reference Guide, Programming Examples, basic oscilloscope application ADCaptureLab (Windows only). This is what is needed to use and program the digitizers in any language.

Software trigger

This is a user-controlled trigger.

The software trigger is activated from the user’s application software. The software trigger can also be used for a watch-dog application for surveillance of the experiment.

Spurious-Free Dynamic Range

SFDR is an important measure which characterizes the dynamic performance of ADCs and DACs. It specifies the ratio between the amplitude of the fundamental and the strongest spurious signal. SFDR together with ENOB give a good understanding of the dynamic performance of SP Devices high-performance digitizers.

Stand alone operation with 10 GbE (–10GBE)

The 10 GbE interface offers the same advantages as the USB3.0 interface. In addition to that the data rate is higher (1 GBytes/s), the distance to the host is longer and there is an electrical isolation from the PC. The protocol is UDP. The data transfer require a point-to-point connection.

Stand-alone operation with USB3.0 interface (–USB)

The SuperSpeed USB3.0 interface is intended for stand-alone operation and allows the ADQ14 to be physically integrated with the detector rather than the host PC. This means that the cable between the detector and the digitizer is kept as short as possible for optimized signal quality. The USB box includes flanges for fastening of the box and screw attachment of the USB cable. With the USB3.0 interface, the digitizer is easily connected to any computer. The sustained data rate can be up to 200 MBytes/s and combined with on-board signal processing, an efficient solution is available.

Standard GPIO for connecting to external equipment

The GPIO (general purpose digital input output) is intended for communication with external equipment. The GPIO is accessed from the software through register read and write commands. In this way, it is used for creating a link between the external equipment and the user’s software application. Real-time interaction with the data flow is also possible through the ADQ14 Development Kit. The GPIO signals are available in the User Logic area and can be used for interacting with the data and control in real-time.

The standard version of ADQ14 has GPIO as a software selectable function on the trigger and sync connectors. This means that the connectors are either used as trigger and sync, or as GPIO signals.

Sustained data rate

The sustained data rate means the average transfer rate from the digitizer to the host PC. The sustained data rate measures the actual rate of real data and is NOT including headers and channel coding. The ADQ can maintain the sustained data rate continuously and uninterrupted. (Note that the PC must have the capacity to receive the data at the specified rate.)

Systems integration with PCIe interface (–PCIE)
  • All in one box
  • High performance computing
  • Cost effective hardware

The PCIe form factor is for integration into the host PC. The high speed PCIe interface can handle data rates up to 5 GBytes/s over x8 Gen 3 PCIe links. This is especially useful when combining the digitizer with heavy computation in, for example, a GPU in the same PC. The board is half length to enable compact solutions.

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