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

Revision as of 14:33, 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	Outputs for SiPM bias voltage	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.

@@ Line 180: / Line 180: @@
 === +210V supply ===
-Use for:
+{| cellspacing=3 border=1 |
-*AD5535 DAC
+|'''IC Name'''
-**VPP high voltage supply
+|'''Pin Name'''
-***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.
+|'''Tolerance'''
+|'''Current Requirements'''
+|'''Description'''
+|'''Notes'''
+|-
+| AD5535
+| VPP
+| large
+| Depends on SiPM specs
+| Outputs for SiPM bias voltage
+| 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.
+|-
+|}