261
edits
Changes
Jump to navigation
Jump to search
Line 1:
Line 1: − + − '''TODO: Insert AD7928 voltage requirements'''+ − + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + − Use for:+ − *FPGA − **VCCINT internal logic supply − + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + − Use for: − *AD7928 ADC − **REF_IN reference supply − ***Must be accurate to ±1% Line 46:
Line 127: + + + + + + + + + + + + + + + + + + + + + +
SiPM digital control board power supplies (view source)
Revision as of 13:55, 26 June 2008
, 13:55, 26 June 2008started adding table with current 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. 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 ==
=== +1.2V 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
| AVDD can be as low as 2.7V if voltages measured never exceed 2.5V
|}
=== ICs requiring +3.3V ===
=== +2.5V supply ===
{| 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
| ??? CMOS logic tolerance
| 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
|
|-
|}
=== +3.3V supply ===
=== +3.3V supply ===
**VCCJ JTAG output driver
**VCCJ JTAG output driver
***''Are we using this?''
***''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 ===
=== +5V supply ===