CT1815FP datasheet(2/7 Pages) AEROFLEX

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Aeroflex Circuit Technology

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

Transmission

The CT1815 accepts synchronous NRZ Data in

conjunction with two clocks signals. The NRZ data

stream is then converted to Manchester code which

is transformer coupled to a 75 ohm Tri-axial cable for

transmission up to 1000 ft.

The transmitter may be placed into standby

condition. This reduces power consumption by

approximately 600mW. Power management is made

available via two standard TTL input pins. The

Receiver is always active and is not affected by the

power management circuitry.

The transceiver is matched for 75 ohm operation

over a wide band of frequencies. This condition is

maintained with power on and off.

Reception

The CT1815 receiver section accepts a bipolar

signal which is level detected and passed to the

serial decoder. The decoder section reconstructs

the data and strips the clock from the serial stream.

An NRZ decoded data stream is then produced

synchronously with a recovered clock. The receiver

is designed to meet the MIL-STD-1397 Type D

requirements.

Electrical Requirements

The specification detailed herein encompasses a

hybrid Transceiver/Encoder-Decoder designed to

meet the requirements of the MIL-STD-1397 Type D.

The transceiver is transformer coupled to the

specified triaxial cable and is screened to the

individual test methods of MIL-STD-883

See Figure 1 for Block Diagram. Inputs and

Outputs are all Synchronous NRZ DATA STREAMS

Transformer Isolation

The CT1815 is connected with pin 3 and pin 32 to

the ACT15-1031 transformer secondary winding.

The center tap of the secondary winding is

connected to +5 volts. For matching 75

Ω load

operation, a 78

Ω resistor must be placed across the

primary winding of the transformer.

Encoder Timing / Transmitter Specification

Symbol

Parameter / Condition

Min

Typ

Max

Unit

Encode Timing

Input data set-up time

Encode clock set-up time

Encode envelope set-up time

Encode envelope turn-off time

Transmitter activation set-up time

150

Transmitter deactivation hold-time

tw1

20 MHz gated CK pulse width high

tw2

Encoder shift CK pulse width high

Output Signals

Output amplitude (see Figure 2)

2.75

3.25

3.75

Pulse period

100

103

Width of 1st positive half bit

Width of last half bit

T/2

Half pulse period

Pulse rise time

2.0

V/ns

Pulse fall time

2.0

V/ns

Voltage overshoot

350

Tos

Offset Voltage 2T after last zero crossing

150

Tdtx

Delay from 20 MHz clock input to data output on

transformer secondary

Output Impedance

Ω

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