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10k Ohms input, +/-4.0 V
range (no input attenuation*)
*Other impedances and voltage ranges with on-board attenuation
Gate (TTL 3.3V) signal used to suppress data acquisition
|Data I/O||USB 2.0||On-board USB 2.0 is available|
|RS-232||RS-232 Serial communications up to 921 kBaud|
|OEM||OEM Option 1: Analog Devices high-speed serial port (SPORT) via the flat-flex interconnect
OEM Option 2: 16-bit IDMA bus; 4 general purpose digital I/O lines, two of which can be configured for industry standard I2C interface; connected via a high-density board-to-board connector. The microComU USB interface employs this connection.
|Real-Time I/O||4 general purpose digital I/O lines, two of which can be configured for industry standard I2C interface|
|Digitizer||ADC||14-bits at 40 MSPS standard
high-speed 80 MSPS option
Two gain options are available, combined with a digital fine gain adjustment ranging +/- 6dB
DC offset adjustment: -4.4V to +4.4V
Three triangular/trapezoidall filters are employed to suppress noise, and to detect and acquire baseline and energy data:
*These numbers assume standard 40 MSPS ADC, and should be scaled for 80 MSPS option.
A separate 12-bit (0-4095) threshold can be enabled/disabled and adjusted for each of the three filters
Two pileup rejection settings :
|Data collection||MCA limits and number of bins
||MCA||256 to 8192 channels (32 bits deep)
Additional memory for sum or 2D spectra
|Statistics||Livetime, runtime, input counts, output counts, overflows and underflows|
|Diagnostics||Oscilloscope, baseline distribution, access to raw DSP memory|
|Hardware||Power Requirements||+/- 5V @ 50 mA clean supply, or +/-5.25V @ 50 mA dirty supply to feed on-board regulators
+3.3V @ 150 mA
|Dimensions||2.125" W x 3.375" L|
The microDXP miniaturized circuit-board can easily be incorporated into a variety of benchtop, portable, networked and embedded x-ray and gamma-ray spectroscopy data acquisition systems. In the first example the microDXP runs on the laboratory benchtop as a peripheral device. In the second example a more complex embedded system is considered. The I2C serial bus is used to control a ‘smart’ x-ray tube and detector HV bias supply, and the auxiliary digital I/O drives electromechanical or pneumatic components in real time based upon user defined metrics of acquired data.
Example 1. General-Purpose Spectrometer
In this example the microDXP and hardware included in the Development Kit act as a general-purpose digital pulse-processor, connected as a peripheral device under the control of a host computer. No specialized data acquisition modes are required, thus no firmware development is necessary.
XIA non-recurring engineering (NRE) required: None
User development required: Enclosure design
The microDXP, power supplies and microComU
together constitute a digital pulse-processor that can be connected to virtually
any controller with USB or RS-232 communications. Note: The microComU
interface board included with the development
kit falls into this category.
Fig. 1: A general-purpose spectrometer incorporating the microDXP. The microComU interface connects the microDXP to the host computer and power supplies.
Example 2. Dedicated Embedded Spectrometer
This example considers a materials sorting application
where objects with certain pre-defined alloy ratios X, Y and Z are to
be separated from others. An x-ray source irradiates incoming samples,
and incident x-rays are collected by a solid-state detector connected
to the microDXP. The microDXP is configured to assert a combination
of its auxiliary digital I/O lines whenever the peak ratio X,Y, or Z
is detected. The digital I/O lines drive electromechanical or pneumatic
components in real-time to execute the appropriate mechanical operation,
e.g. put the recognized object in the desired bin. User controls are
limited to starting and stopping the system, and selecting one out of
a small number of operating modes. Power supplies for the microDXP are
also included. Finally, an external data port (e.g. RS-232) is also
included so that ratios corresponding to new alloys can be defined,
and new firmware uploaded without dismantling the hardware; or, alternatively,
the microDXP could periodically be run in full MCA mode under computer
control for diagnostic purposes.
XIA non-recurring engineering (NRE) required:
User development required:
Fig. 2: A system with a fully embedded host and user interface, with real time controls via the Auxiliary digital I/O.
Designing the system described above using conventional spectroscopy components would be a much more complex (and considerably more expensive) task, when compared with the solutions proposed here. Please contact the microDXP team at to discuss your application today!
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http://www.xia.com/microDXP.html, last updated
June 22, 2018