SiPM digital control board power supplies
As seen in the SiPM digital control board netlist, the ICs on the control board have many different power requirements. In total there are 6 different voltages required. To minimize the number of actual power supplies needed, however, we plan on supplying only +5V, -5V, and +210V to the board from external power supplies. The other voltages will be created by appropriate voltage regulator ICs on the control board.
+5V supply
The +5V supply is responsible for powering most of the components on the control board. Here is a breakdown of those components by their voltage requirements. Voltages less than +5V will be created using voltage regulators
ICs requiring +5V
| IC Name | Pin Name | Tolerance | Current Requirements | Description | Notes |
| AD5535 | V+ | ±0.25V | 0.5mA typ, 1mA max | Positive amplifier | |
| AD5535 | AVCC | ±0.25V | 15mA typ, 18mA max | Analog supply | |
| AD7928 | AVDD | ±0.25V | 2.7mA max operating | Analog supply | AVDD can be as low as 2.7V if voltages measured never exceed 2.5V |
ICs requiring +3.3V
| IC Name | Pin Name | Tolerance | Current Requirements | Description | Notes |
| AD5535 | ANODE | large | set by external resistor | Temperature sensing diode | Diode drop varies w/ temperature. Requires external current limiting resistor. |
| AD5535 | REF_IN | ~±0.4V | 1.25uA max | Reference voltage | Should be as high as possible but not exceed AVCC-1.15V |
| AD7314 | VDD | ±0.3V | 1.2mA typ operating | Indicates ±1°C precision | |
| AD7928 | VDRIVE | ±0.3V | 200uA | Logic output driver | |
| CP2201 | AV+ | ±0.3V | ??? | Analog supply pin | |
| CP2201 | VDD1 | ±0.3V | 75mA typ, 155mA max operating | Digital supply pin | |
| CP2201 | VDD2 | ±0.3V | 75mA typ, 155mA max operating | Digital supply pin | |
| XC3S50A | VCCAUX | ±0.3V | Varies | Auxiliary power supply | FPGA program greatly affects power requirements |
| XC3S50A | VCCO | ±0.3V | Varies | Auxiliary power supply | FPGA program greatly affects power requirements |
ICs requiring +2.5V
| IC Name | Pin Name | Tolerance | Current Requirements | Description | Notes |
| AD7928 | REF_IN | ±1% (±0.025V) | ±1uA max | Reference voltage |
-5V supply
Use for:
- AD5535 DAC
- V- amplifier supply pins
+210V supply
Use for:
- AD5535 DAC
- VPP high voltage supply
- Using this high voltage will allow for large adjustments of the SiPM amplifier bias voltages. Large variations may be necessary because the MATLAB model showed that adjustments between 0 and +50V had no effect on the SiPM.
- VPP high voltage supply