6

SCD4444 Rev B

NC

FIGURE 3 – TYPICAL CONNECTIONS – DATABUS INTERFACE, DIRECT COUPLED STUB,

FIGURE 4 – TYPICAL CONNECTIONS – DATABUS INTERFACE, DIRECT COUPLED STUB,

-VTH RTN

+VTH RTN

Rx GND3

Rx GND2

Rx GND1

GND2

CTRUNC

GND1

VCA CONT 1

Tx DATA BUF IN

VREF

Tx DATA FIL OUT

Tx DATA FIL OUT

Tx DATA BUF IN

Tx INHIBIT IN

Tx DATA IN

Tx DATA IN

+VTH

Rx 1 IN

COMP 1 NH

COMP 1 NI

Rx 2 OUT

Rx 1 OUT

COMP IN

Rx FIL OUT

Rx DATA IN

Tx DATA OUT

*

Rx DATA IN

Tx DATA OUT

*

COMP +VTH IN

COMP -VTH IN

-VTH

VL

COMP +VTH IN

43

46

29

50

42

55

20

26

23

19

13

11

8

6

57

58

59

34, 54, 56

39

45

37

38

36

31

32

33

28

30

41

48

51

16

52

3

40

44

10-15pF

NPO

0.01µF

CERAMIC

0.47µF

CERAMIC

0.01µF

CERAMIC

6.8µF

TANTALUM

+

+15Vdc

Tx DATA OUT

Tx DATA OUT

Rx DATA OUT

Rx DATA OUT

0.01µF

CERAMIC

6.8µF

TANTALUM

+

Tx INHIBIT IN

Tx DATA IN

Tx DATA IN

8

7

5

4

1 : 1

6

3

1

2

NC

COMP 2 NI

COMP 2 NH

Rx 2 IN

55

55

5K

Ω

5K

Ω

1/

1/

2/

Notes:

1/ 5K

Ω Tolerance ±5%, Ratio 1%.

2/ Range 10-15pF. To adjust positive half of command sync for nominal 1500ns.

Rx STROBE IN

27

Rx STROBE IN

Zo

Zo

Data

Bus

Wire

Pair

A

A'

B

B'

+5Vdc

ACT4444

10

35, 47

43

46

29

50

42

55

20

26

23

19

13

11

8

6

57

58

59

34, 54, 56

1, 18

53

41

48

51

16

52

3

10-15pF

NPO

0.01µF

CERAMIC

0.47µF

CERAMIC

0.01µF

CERAMIC

10K

Ω, 5%

6.8µF

TANTALUM

+

+15Vdc

Tx DATA OUT

Tx DATA OUT

-15Vdc

0.01µF

CERAMIC

6.8µF

TANTALUM

0.01µF

CERAMIC

6.8µF

TANTALUM

+

Tx INHIBIT IN

Tx DATA IN

Tx DATA IN

8

7

5

4

1 : 1

6

3

1

2

55

55

5K

Ω

5K

Ω

1/

1/

2/

Notes:

1/ 5K

Ω Tolerance ±5%, Ratio 1%.

2/ Range 10-15pF. To adjust positive half of command sync for nominal 1500ns.

Pulse 1553-1

Zo

Zo

Data

Bus

Wire

Pair

A

A'

B

B'

+5Vdc

39

45

37

38

36

31

32

33

30

28

40

44

NC

NC

Rx DATA OUT

Rx DATA OUT

39

45

37

38

36

31

32

33

30

28

40

44

NC

Rx DATA OUT

Rx DATA OUT

-VTH RTN

+VTH RTN

Rx GND3

Rx GND2

Rx GND1

GND2

CTRUNC

GND1

VCA CONT 1

Tx DATA BUF IN

VREF

Tx DATA FIL OUT

Tx DATA FIL OUT

Tx DATA BUF IN

Tx INHIBIT IN

Tx DATA IN

Tx DATA IN

COMP IN

Rx FIL OUT

Rx DATA IN

Tx DATA OUT

*

Rx DATA IN

Tx DATA OUT

*

VL

ACT4444

+VTH

COMP 2 NI

COMP 2 NH

Rx 2 IN

Rx 1 IN

COMP 1 NH

COMP 1 NI

Rx 1 OUT

Rx 2 OUT

COMP +VTH IN

COMP -VTH IN

-VTH

COMP +VTH IN

+VTH

COMP 2 NI

COMP 2 NH

Rx 2 IN

COMP +VTH IN

COMP -VTH IN

-VTH

COMP +VTH IN

Rx STROBE IN

27

Rx STROBE IN

or Equivalent

Pulse 1553-1

or Equivalent

NORMALLY HIGH RECEIVER IDLE STATE

NORMALLY LOW RECEIVER IDLE STATE

*

*

* High current lines (~100mA)

+

9

5, 14

1/

50K

Ω

50K

Ω

1%

1%

10K

Ω, 5%

60

61

DEXORIN

DEXORIN

1, 18

53

*

9

50K

Ω

50K

Ω

1%

1%

60

61

DEXORIN

DEXORIN

10

35, 47

-15Vdc

0.01µF

CERAMIC

6.8µF

TANTALUM

*

* High current lines (~100mA)

+

5, 14