eroflex Circuit T

Features

• Internally set threshold

• Matched to 50 ohm system impedance power on and off

• Operates with ±5 volt supplies

• Power management

• Accepts synchronous input data

• Unique Manchester decoder requires no clock

• Generates one clock per received bit

• May be used for serial decoding of indefinite word lengths

• Other Wire and Fiber Optic types available

General Description

The CT1815 is a single hybrid micro-circuit which incorporates a serial encoder, transceiver, and Manchester decoder

in one package. The encoder accepts serial NRZ data in conjunction with two synchronous clocks. This data stream is

then Manchester encoded and maybe transformer coupled thru an external transformer to a 75 ohm tri-axial cable for

transmission through up to 1000 feet of cable. The CT1815 receiver section accepts bipolar Manchester encoded

signals and passes level detected signals to the serial decoder. The serial decoder reconstructs an NRZ data stream

with derived clock. This allows the data to be processed by our CT2500 monolithic protocol chip for MIL-STD-1397 serial

interfaces. All the input and output signals of the CT1815 are completely compatible with the CT2500. The CT1815 has

a power management function. A transmitter standby mode is available to reduce the overall power consumption of the

CIRCUIT TECHNOLOGY

www.aeroflex.com

for MIL-STD-1397 Type D

10MHz Low Level Serial Interface

F

I

E

I

D

C

E

R T

F

L E

X L A

ISO

9001

Serial

Manchester

Encoder

Power

Management

Manchester

Decoder

and

Clock Regeneration

Data

Reconstruction

Serial NRZ Data

10 MHz Shift Clock

20 MHz Gated Clock

Envelope

Master Reset

Encoder Enable

Power Management

Decoded Data Envelope

Rx Strobe

XFMR SEC/DATA Input

Primary

Output

+5V

XFMR SEC/DATA Input

Data

Primary

Output

Data

XFMR SEC

XFMR SEC

Figure 1 – Block Diagram

External to

Hybrid

1CT:1

ACT15-1031

CT1815

78

Ω