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Digital control board documentation (view source)
Revision as of 20:00, 15 June 2009
, 20:00, 15 June 2009→Setting the Output Range: formatting
The output range of the DAC is set by the 2.5V reference voltage supplied by VR4. The high voltage power supply must supply at a minimum 50 times this voltage, plus 10. Thus, the high voltage power supply should be at least 135V for DAC to operate properly, even though the SiPMs are expected to need only 40V. If it is convenient to use a lower high voltage, VR4 must be replaced to provide lower reference voltage. The high voltage may then be decreased appropriately. To summarize:
The output range of the DAC is set by the 2.5V reference voltage supplied by VR4. The high voltage power supply must supply at a minimum 50 times this voltage, plus 10. Thus, the high voltage power supply should be at least 135V for DAC to operate properly, even though the SiPMs are expected to need only 40V. If it is convenient to use a lower high voltage, VR4 must be replaced to provide lower reference voltage. The high voltage may then be decreased appropriately. To summarize:
Max output voltage = VREF*50
* Max output voltage = VREF*50
Minimum high voltage supply = VREF*50 + 10
* Minimum high voltage supply = VREF*50 + 10
If relevant, R13 is a 100K resistor.
If relevant, R13 is a 100K resistor.