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參數(shù)資料
| 型號： | CT1815FP |
| 廠商： | Aeroflex Inc. |
| 英文描述： | CT1815 10MHz Low Level Serial Interface for MIL-STD-1397 Type D |
| 中文描述： | CT1815 10MHz的串行接口低級別的MIL - STD - 1397 D型 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 81K |
| 代理商： | CT1815FP |
Aeroflex Circuit Technology
SCDCT1815 REV A 6/12/98 Plainview NY (516) 694-6700
2
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
load
operation, a 78
resistor must be placed across the
primary winding of the transformer.
Encoder Timing / Transmitter Specification
Symbol
Parameter / Condition
Min
Typ
Max
Unit
Encode Timing
t1
Input data set-up time
10
10
10
10
150
50
20
45
40
40
40
35
ns
ns
ns
ns
ns
ns
ns
ns
t2
Encode clock set-up time
t3
Encode envelope set-up time
t4
Encode envelope turn-off time
t5
Transmitter activation set-up time
t6
Transmitter deactivation hold-time
tw1
20 MHz gated CK pulse width high
30
55
tw2
Encoder shift CK pulse width high
Output Signals
Va
Output amplitude (see Figure 2)
2.75
97
45
47
47
3.25
100
3.75
103
65
65
53
2.0
2.0
350
150
V
ns
ns
ns
ns
V/ns
V/ns
mV
mV
T
Pulse period
Ts
Width of 1st positive half bit
Te
Width of last half bit
T/2
Half pulse period
50
Tr
Pulse rise time
Tf
Pulse fall time
Vs
Voltage overshoot
Tos
Offset Voltage 2T after last zero crossing
Tdtx
Delay from 20 MHz clock input to data output on
transformer secondary
Output Impedance
20
55
ns
Zo
70
75
80
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