Difference between revisions of "SiPM digital control board power supplies"

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(started adding table with current requirements)
(added 2.5V section)
Line 68: Line 68:
 
| AD7928
 
| AD7928
 
| VDRIVE
 
| VDRIVE
−
| ??? CMOS logic tolerance
+
| ±0.3V
 
| 200uA
 
| 200uA
 
| Logic output driver
 
| Logic output driver
Line 93: Line 93:
 
| Digital supply pin
 
| 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 ===
 +
{| cellspacing=3 border=1 |
 +
|'''IC Name'''
 +
|'''Pin Name'''
 +
|'''Tolerance'''
 +
|'''Current Requirements'''
 +
|'''Description'''
 +
|'''Notes'''
 +
|-
 +
| AD7928
 +
| REF_IN
 +
| ±1% (±0.025V)
 +
| ±1uA max
 +
| Reference voltage
 +
|
 +
|-
 +
|}
 +
| ANODE
 +
| large
 +
| set by external resistor
 +
| Temperature sensing diode
 +
| Diode drop varies w/ temperature. Requires external current limiting resistor.
  
−
=== +3.3V supply ===
 
−
 
−
Use for:
 
−
*AD5535 DAC
 
−
**ANODE
 
−
***Used for temperature monitoring. Voltage drop across a temperature sensitive diode allows AD7928 to measure internal temperature of AD5535. External resistor on AD5535 CATHODE will help to limit current draw.
 
−
**REF_IN supply
 
−
***Using +3.3V for REF_IN limits the SiPM amplifier bias voltages to a maximum of 165V. If greater variability is needed (up to +200V max), a separate +4V supply can be used for REF_IN, perhaps taken from the +5V rail via a voltage divider.
 
−
*AD7314 temperature sensor
 
−
**VDD supply
 
−
***indicates ±1°C accuracy
 
−
***should make compatible with 3.3V CMOS logic
 
−
*AD7928 ADC
 
−
**VDRIVE output driver supply
 
−
*CP2201 Ethernet
 
−
**AV+ analog supply
 
−
**VDD1 digital supply
 
−
**VDD2 digital supply
 
−
*FPGA
 
−
**VCCAUX auxiliary supply
 
−
***Can also operate at +2.5V
 
−
**VCCO I/O logic supply
 
−
***Makes it compatible with 3.3V CMOS logic
 
−
***Puts it within acceptable range of voltages for communication with other ICs
 
−
*XCF01S EEPROM
 
−
**VCCINT internal supply
 
−
**VCCO output driver
 
−
***Matches 3.3V I/O on FPGA
 
−
**VCCJ JTAG output driver
 
−
***''Are we using this?''
 
−
*AD5535 DAC
 
−
**V+ amplifier supply pins
 
−
**AVCC analog supply pins
 
−
**DVCC digital supply pins
 
−
*AD7928 ADC
 
−
**AVDD pins
 
−
***indicates measuring range of 0 to 2xREF_IN voltage
 
−
 
−
=== +1.2V supply ===
 
−
 
−
Use for:
 
−
*FPGA
 
−
**VCCINT internal logic supply
 
−
 
−
=== +2.5V supply ===
 
−
 
−
Use for:
 
−
*AD7928 ADC
 
−
**REF_IN reference supply
 
−
***Must be accurate to ±1%
 
−
 
−
 
−
 
−
=== +5V supply ===
 
−
Use for:[[Image:AD5535 Power Supply Diagram.gif|thumb|Suggested AD5535 power supply connections taken from AD5535 data sheet.]]
 
−
*AD5535 DAC
 
−
**V+ amplifier supply pins
 
−
**AVCC analog supply pins
 
−
**DVCC digital supply pins
 
−
*AD7928 ADC
 
−
**AVDD pins
 
−
***indicates measuring range of 0 to 2xREF_IN voltage
 
  
 
=== -5V supply ===
 
=== -5V supply ===

Revision as of 14:12, 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 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

| ANODE | large | set by external resistor | Temperature sensing diode | Diode drop varies w/ temperature. Requires external current limiting resistor.


-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.
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