MCE Power
The MCE power requirements are:
| +Vcore | 3V | 5A |
| +Vlvd | 4.5V | 3A |
| +Va | 6.2V | 15A |
| -Va | -6.2V | 2A |
| +Vah 1 | 10V | 0.1A |
1: 10V supply only used when Readout Card Rev. B or Bias Card Rev. D is present in a subrack. 10V was used to generate reference voltages for DACs.
There are different solutions for powering up an MCE.
- Linear Supplies
A straight-forward method is to use linear supplies configured to satisfy the above requirements. In that case the MCE has to be equipped with the right Linear-Feed connector.
The 5-MDM MCE (72HP, SCUBA2 style) has 2 Circular Amphenol connectors in the front panel. Pinout is here:Amphenol pinout]
The 3-MDM MCE (48HP, Spider Style) has a Winchester MRA-34P-G connector in the front panel. Pinout can be found under Winchester connector, here : 48HP PSU Connector
As an example, here is how we setup our linear supplies in the lab.
- Switching Supplies (PSA + ACDCU)
The MCE can be equipped with a switching supply (PSA) that is powered by +-150V DC generated by an external AC-DC unit that can reside far from the MCE. The ACDC unit is also designed and supplied by UBC.
So far, there has only been one incident that the switching noise was reported to be unacceptable.
See picture of 5-MDM MCE (72HP)
