Level conversion circuits
The level conversion board project hosts a set of boards in VME form factor, with additional remote diagnostics/monitoring via I2C.
The most urgent (e.g. small series for end 2011) projects are:
- TTL to blocking
- Blocking to TTL
- TTL to RS422 (or RS485, tbd)
- RS422 to TTL
Technical design information
- Documents tab
- List of modules to be upgraded: 3U crates replacement
Repeaters replacement table
Blocking
Board | Functionality | Replaced by | Replacement status |
8 channel repeater | TTL-TTLbar-Blocking to Blocking | conv-ttl-blo | Deployment but not for high frequencies |
16 channel repeater | |||
CTDAC | Blocking to TTL-TTLbar | ||
LA-BLO-TTL | |||
LAF-BLO-TTL | |||
LASB-TTL-BLO | TTL-TTLbar to Blocking | ||
LA-GATE | |||
LA-TTL-BLO | |||
LAPF-TTL-BLO | TTL-TTLbar to Blocking | conv-ttl-blo with pulse width of 4us instead of 1.2us why? |
RS422-RS485
Board | Functionality | Replaced by | Replacement status |
CTDAD | TTL (LEMO 1 pin) to RS485 (LEMO 2 pin) transmitter | conv-ttl-rs485 | Prototyping |
CTDCD | TTL (LEMO 1 pin) to RS485 (DB9) transmitter | ||
CTDCR | RS422-RS485 (DB9) to TTL or RS485 (LEMO 2 pin) | conv-ttl-rs485 + DB9 to DB9 RTM | Design |
CTDAR | Optical E2000 to RS422 | conv-ttl-rs485 + optical to optical RTM | Design |
CTDLT | TTL to Optical E2000 or RS422 (LEMO 2 pin) |
ISSUES*
- CTDAD: it is a must to provide fail-safe outputs and some degree of configuration to the user.
- CTDAR: Fiber optic receiver is no longer available.
Status
- See presentation on project status.
Date | Event |
03-03-2010 | Start defining project in CERN BE/CO-HT wikis page 3U crates replacement |
08-03-2011 | Definition of most urgent four projects and wish for small production by end 2011. |
01-07-2011 | Start working in conv-ttl-blo. |
30-11-2011 | conv-ttl-blo schematics submitted to drawing office. |
09-12-2011 | Start working in conv-ttl-rs485. Listed the needs of RS422-RS485 to/from TTL modules replacement. |
05-04-2012 | conv-ttl-blo front boards received. |
11-05-2012 | conv-ttl-blo and conv-ttl-rs485 RTM boards received. |
09-01-2014 | 100 conv-ttl-blo boards produced and added to stock (See project page for full details). |
30-06-2017 | Launch design effort for optical to optical RTM compatible with conv-ttl-rs485. |
Erik van der Bij, Carlos Gil Soriano, Denia Bouhired - July 5th, 2017