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Line 63: − − === +2.5V supply === − Currently it appears that a +2.5V supply is not necessary. While some components could use a +2.5V supply, running them at +3.3V is also acceptable. This may increase power consumption somewhat, but eliminates the extra traces and other components needed to create a +2.5V supply.
SiPM digital control board power supplies (view source)
Revision as of 19:11, 25 June 2008
, 19:11, 25 June 2008added some AD7928 voltage requirements
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. 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.
'''TODO: Insert AD7928 voltage requirements'''
=== +1.2V supply ===
=== +1.2V supply ===
*FPGA
*FPGA
**VCCINT internal logic supply
**VCCINT internal logic supply
=== +2.5V supply ===
Use for:
*AD7928 ADC
**REF_IN reference supply
***Must be accurate to ±1%
=== +3.3V supply ===
=== +3.3V supply ===
*FPGA
*FPGA
**VCCAUX auxiliary supply
**VCCAUX auxiliary supply
***Can also operate at +2.5V, but to reduce the number of supplies needed, we will operate in +3.3V mode
***Can also operate at +2.5V
**VCCO I/O logic supply
**VCCO I/O logic supply
***Makes it compatible with 3.3V CMOS logic
***Makes it compatible with 3.3V CMOS logic
**VPP high voltage supply
**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.
***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.