Hytec Electronics Ltd

 


VTB 8204 Analogue Input Transition Board 
with Lemo Connectors

  • VME64 extensions / Transition Board
  • Full EMC shielding and insertion/extraction handles
  • RP0 and RP2 connections
  • Handles 32 analogue input signals, four external triggers, four external clocks and provides optional filtering of all signals.
  • Four DC-DC converter sites allow isolated analogue front-end circuits to be powered externally
  • Forty Lemo sockets provide ease of connection to four groups of circuitry each with 8 inputs, trigger and clock.

Product Description

The VTB 8204 is a 6U (double height) VME rear I/O transition board, which provides connection to the 8002 Carrier Board. It optionally conditions and routes the signals from forty two Lemo sockets to the carrier board via the J0 and J2 connectors of the VME backplane. The board includes sites for fitting R-C low-pass filters. Optional on-board 5V to 12V DC-DC converters are connected to pins on the RP0/RP2 connectors to facilitate powering the plant side of isolated analogue circuits on IP boards which are mounted on the carrier board.

Construction

The unit is constructed to the VME64x standard, with EMC rear panel, injector/ejector handles, guide pin and slot keying, static discharge protection, hot swap capability, 5-row RP0 and RP2 connectors.

Signal Path

A rear-mounted transition card with forty Lemo connectors accepts all I/O signals and provides direct or conditioned connection provided by pcb jumper settings. The signals connect to the main carrier board according to the VME64x Greenspring pinout for IP module carriers .

Lemo Connectors

Connector 1 -5 (lowest connectors) Inputs 1-8(+/-), Trigger 1(+/-), Clock1(+/-)
                   6 - 10 Inputs 9-16(+/-),Trigger 2(+/-), Clock2(+/-)
Connector 11 - 15 Inputs 17-24(+/-),Trigger3(+/-),Clock3(+/-)
(top connectors) 16 - 20 Inputs 25-32(+/-),Trigger4(+/-),Clock4(+/-)


Analogue Input Connection Details

Signal VME Connection Lemo Connection
Signal High 1-8 RP2/A6-A13 LM1a - 4b Signal Pin
Signal Low 1-8 RP2/C6-C13 LM1a - 4b Outer Shell
XTrig1 High RP2/A23 LM5a Signal Pin
XTrig1 Low RP2/C23 LM5a Outer Shell
XClk1 High RP2/A25 Lm5b Signal Pin
XClk1 Low RP2/C25 LM5b Outer Shell
AGnd   N/C
     
Signal High 9-16 RP2/D4,D5,Z7,D8D9,Z11,D12,D13 LM6a - 9b Signal Pin
Signal Low 9-16 RP2/D5,D6,D7,Z8D10,D11,Z13,D14 LM6a - 9b Outer Shell
XTrig2 High RP2/Z27 LM10a Signal Pin
XTrig2 Low RP2/D27 LM10a Outer Shell
XClk2 High RP2/D29 LM10b Signal Pin
XClk2 Low RP2/D30 LM10b Outer Shell
AGnd   N/C
     
Signal High 17-24 RP0/A11,C11,E11B12,D12,A13,C13E13 LM11a - LM14b Signal Pin
Signal Low 17-24 RP0/B11,D11,A12,C12,E12B13D13A14 LM11a - LM14b Outer Shell
XTrig3 High RP0/E17 LM15a Signal Pin
XTrig3 Low RP0/A18 LM15a Outer Shell
XClk3 High RP0/D18 LM15b Signal Pin
XClk3 Low RP0/E18 LM15b - Outer Shell
AGnd   N/C
     
Signal High 25-32 RP0/A1,C1,E1,B2,D2,A3,C3,E3 LM16a - 19b Signal Pin
Signal Low 25-32 RP0/B1,D1,A2,C2E2,B3,D3,A4 LM16a - 19b Outer Shell
XTrig4 High RP0/E7 LM20a Signal Pin
XTrig4 Low RP0/A8 LM20a Outer Shell
XClk4 High RP0/D8 LM20b - Signal Pin
XClk4 Low RP0/E8 LM20b - Outer Shell
AGnd   N/C
     

Resistor and Capacitor Network for Filtering

The 8204 provides direct or conditioned connection set by PCB jumper to all input signals
(see diagram below).

The 1K ohm resistors are matched to 0.1%, 1Meg ohms are ±1%.
No filtering components are fitted for IP sites A and B on delivered boards.
Jumpers J33 to J48 select conditioning for IP site C.
Jumpers J49 to J64 select conditioning for IP site D.

PCB JUMPERS

Link between 1 to 2 - filtering selected
Link between 2 to 3 - no filtering, straight through connection.

LK1 connects AGND1 to GND
LK2 connects AGND2 to GND
LK3 connects AGND3 to GND
LK4 connects AGND4 to GND

HYTEC Head Post : 5 Cradock Road, Reading, Berkshire,
RG2 0JT, England.
Phone : +44 (0)118 9757770
Fax : +44 (0)118 9757566

Email : sales@hytec-electronics.co.uk		  
LE3 2FB, England.

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Last modified: July 27, 2005