Aeroflex Circuit Technology

SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700

6

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

TXDATA output/

RX DATA input

Transmitter-Receiver I/O pin (usually connected to pin 33)

33

XFMR secondary

Secondary isolated winding, same phase as outer signal

conductor

34

XFMR primary/

TX DATA output

Transformer lead for connection to outer signal conductor of

tri-axial

Functional Description and Pinout (continued)

Pin

#

Pin Name

Function

Load or

Drive

Load and Drive Definitions

1 S load: requires

1 S drive:

Absolute Maximum Ratings

-7 Volts Max

Logic Input Voltage Applied:

Logic Low

-1.2V @ 10mA Max

Logic High

+5.5 Volts

When used with the internal transformer, the

CT1698 will not be damaged by cable open circuits

or by short circuits of the following types:

•

Line-to-line

•

Line-to-ground

•

To voltage sources of 0 to 115 volts

alternating current, 60 hertz, line-to-ground

Environmental Parameters

Operating Temperature

-55°C to +100°C Case

Storage Temperature

-55°C to +150°C

Screened per individual test methods of

MIL-STD-883

Power Consumption

Current (mA)

Typ

Max

325

450

85

105

380

510

125

160