Difference between revisions of "SiPM digital control board power supplies"
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| Depends on SiPM specs | | Depends on SiPM specs | ||
| − | | | + | | Supply for SiPM bias voltages |
| SiPM bias voltage current requirements are not currently on the wiki. Most likely, this is used more as a reference and less as a power supply. | | SiPM bias voltage current requirements are not currently on the wiki. Most likely, this is used more as a reference and less as a power supply. | ||
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Latest revision as of 14:47, 26 June 2008
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 |
| XCF01S | VCCINT | ±0.3V | 10mA max operating | Internal supply | |
| XCF01S | VCCO | ±0.3V | 10mA max operating | Digital output supply | Serial mode |
ICs requiring +2.5V
| IC Name | Pin Name | Tolerance | Current Requirements | Description | Notes |
| AD7928 | REF_IN | ±1% (±0.025V) | ±1uA max | Reference voltage |
ICs requiring +1.2V
| IC Name | Pin Name | Tolerance | Current Requirements | Description | Notes |
| XC3S50A | VCCINT | ±0.06V | Varies | Internal logic supply | FPGA program greatly affects power requirements |
-5V supply
| IC Name | Pin Name | Tolerance | Current Requirements | Description | Notes |
| AD5535 | V- | ±0.25V | 2.5mA typ, 3.5mA max | Negative amplifier supply |
+210V supply
| IC Name | Pin Name | Tolerance | Current Requirements | Description | Notes |
| AD5535 | VPP | large | Depends on SiPM specs | Supply for SiPM bias voltages | SiPM bias voltage current requirements are not currently on the wiki. Most likely, this is used more as a reference and less as a power supply. |