The MATACQ32 board integrates 4 analog channels. The inputs of these channels are connected through double LEMO plugs (IN0+/- ŕ IN3+/-).
The inputs are by default unipolar and terminated on 50 Ohms. However, the input levels of the board can be very easily modified (by displacing a few resistors and mounting new ones) in such a way as to permit the input in differential mode (which explains the double LEMO plugs). For this purpose, free CMS-805 resistor footprints are indeed implemented on the MATACQ32 board (see IV.1.g).
The analog to digital conversion is made on 12 bits with a maximum dynamic range of 1V, or an LSB of 250µV. This range is centered on 0V (+/- 0.5V). However, free CMS-805 footprints are implemented on the MATACQ32 board for shifting the dynamic range in the interval +/- 0.5V in order to be able to optimize the system for unipolar signals (see IV.1.h).
The measured noise referred to input is less than 200 µV RMS (i-e below the LSB of the ADC), and the non-linearity remains below 1 per 1000 over the whole dynamic range.
There exist five possible sources for the trigger signal. They are selectable by the user : trigger on signal (“normal”), external trigger, software trigger (“auto”), normal + auto, internal random trigger. A second level of trigger is also available to allow the user to validate a pre-selected event by an external validation system. This permits improving the rate of good events read out by the acquisition system. |
