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Line 1: − + − '''TODO: Insert AD7928 voltage requirements'''+ − === +1.2V supply ===+ − Use for:+ − *FPGA+ − **VCCINT internal logic supply+ + + + + + + + + + + + + + + + + + + + + + + + + + + + − + − Use for:+ − *AD7928 ADC+ − **REF_IN reference supply+ − ***Must be accurate to ±1%+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + − + + + + + + + + + + + + + + + + + − Use for:+ − *AD5535 DAC+ − **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+ − *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?'' − + − 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+ + + + + + + + + − + − 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 [[SiPM_Amplifier#Bias_voltage |no effect]] on the SiPM.+ + + + + + + +
SiPM digital control board power supplies (view source)
Revision as of 14:47, 26 June 2008
, 14:47, 26 June 2008no edit summary
As seen in the [[SiPM digital control board netlist]], the ICs on the control board have many different power requirements. This page suggests some compatible voltage supplies that will be necessary on the board. To reduce the number of backplane connections and the number of external supplies needed, some of these supplies might be created using voltage dividers on the control board.
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 ===
{| cellspacing=3 border=1 |
|'''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
|}
=== +2.5V supply ===
=== ICs requiring +3.3V ===
{| cellspacing=3 border=1 |
|'''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
|-
|}
=== +3.3V supply ===
=== 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
|
|-
|}
=== ICs requiring +1.2V ===
{| cellspacing=3 border=1 |
|'''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 ===
== -5V supply ==
{| cellspacing=3 border=1 |
|'''IC Name'''
|'''Pin Name'''
|'''Tolerance'''
|'''Current Requirements'''
|'''Description'''
|'''Notes'''
|-
| AD5535
| V-
| ±0.25V
| 2.5mA typ, 3.5mA max
| Negative amplifier supply
|
|-
|}
=== -5V supply ===
== +210V supply ==
{| cellspacing=3 border=1 |
|'''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.
|-
|}