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Line 93: + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + − === +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
SiPM digital control board power supplies (view source)
Revision as of 14:12, 26 June 2008
, 14:12, 26 June 2008added 2.5V section
| AD7928
| AD7928
| VDRIVE
| VDRIVE
| ??? CMOS logic tolerance
| ±0.3V
| 200uA
| 200uA
| Logic output driver
| Logic output driver
| 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.
=== -5V supply ===
=== -5V supply ===