Aeroflex Circuit Technology

SCDCT1815 REV A 6/12/98 Plainview NY (516) 694-6700

5

Functional Description and Pinout

Pin

#

Pin Name

Function

Load or

Drive

1

No connection

2

No connection

3

XFMR secondary/

RX data input

Transmitter-receiver I/O pin

4

Test Point

No connection permitted

5

Test Point

No connection permitted

6

Test Point

No connection permitted

7

-5 Volts

8

Low level disables receiver

3 S loads

9

Power management

input

Controls transmitter power consumption in conjunction with pin 10

1 S load

10

Encoder enable

Controls transmitter power consumption in conjunction with pin 9

1 S load

11

Case/signal GND

12

Case/signal GND

13

Decoded data

envelope

High after reception of first half bit; goes low after reception of last

half bit (normally low in inactive state)

4 S drive

14

TP3 test point

Alignment point: no electrical connection permitted

15

TP1 test point

Alignment point: no electrical connection permitted

16

TP2 test point

Alignment point: no electrical connection permitted

17

-5 Volts

18

TP4 test point

Alignment point: no electrical connection permitted

19

Reconstructed clock; one clock pulse per input bit received

3 S drive

20

No connection

21

3 S drive

22

No connection

23

+5 volts

24

+5 volts

25

10 MHz encoder shift

clock

One cycle required per data bit. Must be high in first half of bit cell

1 S load

26

NRZ serial input data

Serial input to be Manchester encoded with the 20 MHz gated CK

1 S load

27

Encode envelope

Must be high to enable transmission; must go low before reception

of last 20 MHz positive edge to complete transmission

1 S load

28

20 MHz gated clock

(encoder)

Each bit to be encoded requires two positive edges of the 20 MHz

CK. These edges must occur at 25ns and 75ns into the bit cell.

The end of transmission requires an additional edge in conjunction

1 S load

29

Master reset

reset pulse <15 nsec

Logic low resets encoder

2 S load

30

No connection

31

No connection

32

XFMR secondary/

RX DATA input

Transmitter-Receiver I/O pin

33

XFMR secondary

Secondary isolated winding, same phase as outer conducter

34

XFMR primary/

TX DATA output

Transformer lead for connection to outer conductor of tri-axial