Hytec Electronics Ltd

Analogue Output/Input Transition Board VTB 8208

Product Description

The VTB 8208 is a 6U (double height) transition board. Its main features are:

  • 16 summing amplifiers to provide 16 high resolution outputs using two DAC8402 IP cards. 
    Adjacent DAC channels are summed with a 50:1 ratio.
  • Allows outputs to be sensed by two ADC8401 or MADC8403 IP cards
  • Two 50-way connectors (A and B) provide 16 summed outputs with feedback sense wires. A third connector (C) allows direct input to two ADC cards. On-board jumpers allow isolation of the ADC inputs from the sense lines of connectors A and B
  • Excitation,D.C. or pulsed, from MADC8403.
  • On-board DC-DC converters supply output summing amplifiers
  • On board calibration.
    •

Target Specification

Mechanical: Standard 6U high VME64X transition board
Operating temp: 0 to 45 deg C ambient
Number of channels: 16 summed outputs/16 differential inputs
Input/output voltage range: 0 to +10V
Input impedance: Set by resistor selection. Nominally 20K.
Acquisition time: 100ms
Switch time: 10us when enabled
Excitation: 1mA or 5V supplied by 8403
ADC Isolation: 100V with respect to VME 0V limited by 8403
Power: +5V @ 2.5A typical

Operating Modes


Configuration  

There are three basic operating modes which can be combined to requirements:

1)Summed DAC outputs allow one DAC to set a value which is fine trimmed by a second DAC
2)ADC inputs allow outputs from connectors 1 and 2 to be sensed and read back.
3)ADC inputs direct from connector 3 allow direct use of the ADCs.

Excitation

Two forms of excitation are available:-

  1. 5V D.C.
  2. Programmable current source 0 to +1mA

Connectors 

Three 50-way connectors A,B and C provide 16 single-ended voltage outputs and 16 differential inputs.

Pin Assignments

Connector A

Pin

Signal

Pin

Signal

1

AGND1

26

OUT1

2

-Sense1

27

+Sense1

3

AGND1

26

OUT2

4

-Sense2

27

+Sense2

5

AGND1

26

OUT3

6

-Sense3

27

+Sense3

7

AGND1

26

OUT4

8

-Sense4

27

+Sense4

9

AGND1

26

OUT5

10

-Sense5

27

+Sense5

11

AGND1

26

OUT6

12

-Sense6

27

+Sense6

13

AGND1

26

OUT7

14

-Sense7

27

+Sense7

15

AGND1

26

OUT8

16

-Sense8

27

+Sense8

17

42

18

Xtrig +

43

Xtrig-

19

44

20

XClk+

45

XClk-

21

46

22

47

23

48

24

AGND1

49

AGND1

25

AGND1

50

AGND1


Connector B

Pin

Signal

Pin

Signal

1

AGND2

26

OUT1

2

-Sense9

27

+Sense9

3

AGND2

26

OUT1

4

-Sense10

27

+Sense10

5

AGND2

26

OUT1

6

-Sense11

27

+Sense11

7

AGND2

26

OUT1

8

-Sense12

27

+Sense12

9

AGND2

26

OUT1

10

-Sense13

27

+Sense13

11

AGND2

26

OUT1

12

-Sense14

27

+Sense14

13

AGND2

26

OUT1

14

-Sense15

27

+Sense15

15

AGND2

26

OUT1

16

-Sense16

27

+Sense16

17

42

18

Xtrig +

43

Xtrig-

19

44

20

XClk+

45

XClk-

21

46

22

47

23

48

24

AGND2

49

AGND2

25

AGND2

50

AGND2

Connector C

Pin

Signal

Pin

Signal

1

Ch1 +

26

Ch1 -

2

Ch2 +

27

Ch2 -

3

Ch3 +

28

Ch3 -

4

Ch4 +

29

Ch4 -

5

Ch5 +

30

Ch5 -

6

Ch6 +

31

Ch6 -

7

Ch7 +

32

Ch7 -

8

Ch8 +

33

Ch8 -

9

Ch9 +

34

Ch9 -

10

Ch10 +

35

Ch10 -

11

Ch11 +

36

Ch11 -

12

Ch12 +

37

Ch12 -

13

Ch13 +

38

Ch13 -

14

Ch14 +

39

Ch14 -

15

Ch15 +

40

Ch15 -

16

Ch16 +

41

Ch16 -