CT1815
10MHz Low Level Serial Interface
for MIL-STD-1397 Type D
Features
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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
CIRCUIT TECHNOLOGY
www.aeroflex.com
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9001
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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
CT1815. Aeroflex Circuit Technology is an 80,000ft
2
MIL-PRF-38534 certified facility in Plainview, N.Y.
Serial NRZ Data
10 MHz Shift Clock
20 MHz Gated Clock
Envelope
Master Reset
Encoder Enable
Power
Management
Power Management
Decoded Data Envelope
Manchester
Decoder
and
Clock Regeneration
Clock
R
Decoded Data
R
Data
Reconstruction
Serial
Manchester
Encoder
XFMR SEC/DATA Input
XFMR SEC
Primary
Data
Output
78Ω
Primary
Data
Output
XFMR SEC
ACT15-1031
External to
Hybrid
1CT:1
+5V
XFMR SEC/DATA Input
Rx Strobe
Figure 1 – Block Diagram
eroflex Circuit T
echnology
– Data Bus Modules For The Future © SCDCT1815 REV A 6/12/98
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
