History

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

Repeaters replacement table

Blocking

Board Functionality Replaced by Replacement status
8 channel repeater TTL-TTLbar-Blocking to Blocking conv-ttl-blo Prototype testing
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 to RS485 transmitter conv-ttl-rs485 Prototyping
CTDCD TTL to RS485 transmitter
CTDCR RS422-RS485 receiver
CTDAR Optical E2000 to RS422
CTDLT TTL to Optical E2000 or RS422
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

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.

Erik van der Bij, Carlos Gil Soriano - 09-01-2012