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PDF CT1698 Data sheet ( Hoja de datos )
| Número de pieza | CT1698 | |
| Descripción | CT1698 MIL-STD-1397 Type E 10MHz Low Level Serial Interface | |
| Fabricantes | Aeroflex Circuit Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CT1698 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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CT1698
MIL-STD-1397 Type E 10MHz
Low Level Serial Interface
Features
• Optional transformer isolation
• Internally set threshold
• Matched to 50 ohm system impedance power on and off
• Operates with ±5 volt supplies
• Power management
• External output level adjustment
• 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
• Interfaces directly to the CT2500 protocol device
• Other Wire and Fiber Optic types available
CIRCUIT TECHNOLOGY
www.aeroflex.com
FLEX LA
ISO
9001
CE R T I F I E D
General Description
CT1698 is a single hybrid microcircuit which incorporates a serial encoder, transceiver, and Manchester decoder in one package.
The encoder accepts serial NRZ data in conjunction with two synchronous clocks. The CT1698 receiver section accepts bipolar
Manchester encoded signals and passes level detected signals to the serial decoder. The CT1698 has a power management function
and a variable drive level option. The transmitter standby mode is available to reduce the overall power consumption of the CT1698.
The variable drive level output is externally programmable for testing purposes. Aeroflex Circuit Technology is a 80,000 square foot
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
Serial
Manchester
Encoder
Power
Management
Power Management
Drive 1
XFMR SEC/DATA Input
XFMR SEC
Primary
+5V Data
Output
Primary
Data
Output
XFMR SEC
XFMR SEC/DATA Input
Drive 2
Decoded Data Envelope
Manchester
Decoder
and
Clock Regeneration
Data
Reconstruction
Rx Strobe
ClockR
Decoded DataR
Figure 1 – Block Diagram
eroflex Circuit Technology – Data Bus Modules For The Future © SCDCT1698 REV A 6/12/98
1 page  
Drive Level Control Pins
External Resistors may be connected from pins 5 and 6 to VEE or GND to change the Transmitter Output
Level. If pins 5 and 6 are left open the CT1698 operates within the MIL-STD-1397 Type E specification.
Resistors connected from pins 5 and 6 to VEE or Ground must be equal. Unequal resistors will result in a
transmitter output offset level.
The formula for peak to peak transmitter output swing with resistors connected between 5 and 6 to VEE
is:
VOUTpk-pk =
1.39
+
125 ±
REXT
15% Volts,
REXT > 90Ω
The formula for peak to peak transmitter output swing with resistors connected between pins 5 and 6 to
ground is:
VOUTpk-pk =
1.39
-
50 (VEE -2.5)
REXT
±
15% Volts,
REXT > 180Ω
Functional Description and Pinout
Pin
#
Pin Name
1 XFMR primary/
TX data output
2 XFMR secondary
3 TXDATA output/
RX data input
4 No connection
5 Drive 2
6 Drive 1
7 -5 Volts
8 RX strobe
9 Power management
input
10 Encoder enable
11 Case/signal GND
12 Case/signal GND
13 Decoded data
envelope
14 TP3 test point
15 TP1 test point
16 TP2 test point
17 -5 Volts
18 TP4 test point
19 ClockR
20 No connection
21 Decoded DataR
Aeroflex Circuit Technology
Function
Transformer lead for connection to center conductor of tri-axial
cable
Secondary isolated winding, same phase as center conductor
Transmitter-receiver I/O pin (usually connected to pin 2)
Load or
Drive
Output level adjustment selected by resistor to GND or VEE
Output level ajustment selected by resistor to GND or VEE
Low level disables receiver
3 S loads
Controls transmitter power consumption in conjunction with pin 10 1 S load
Controls transmitter power consumption in conjunction with pin 9 1 S load
High after reception of first half bit; goes low after reception of last
half bit (normally low in inactive state)
Alignment point: no electrical connection permitted
Alignment point: no electrical connection permitted
Alignment point: no electrical connection permitted
4 S drive
Alignment point: no electrical connection permitted
Reconstructed clock; one clock pulse per input bit received
3 S drive
NRZ reconstructed data. Sampled on clockR rising edge
3 S drive
5 SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet CT1698.PDF ] | |
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