CT1698 Datasheet, PDF (5/7 Pages) Aeroflex Circuit Technology – CT1698 MIL-STD-1397 Type E 10MHz Low Level Serial Interface

Drive Level Control Pins
External Resistors may be connected from pins 5 and 6 to V_EE 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 V_EE 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 V_EE
is:
V_OUTpk-pk =
1.39
+
125 ±
R_EXT
15% Volts,
R_EXT > 90Ω
The formula for peak to peak transmitter output swing with resistors connected between pins 5 and 6 to
ground is:
V_OUTpk-pk =
1.39
-
50 (V_EE -2.5)
R_EXT
±
15% Volts,
R_EXT > 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 R_X 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 Clock_R
20 No connection
21 Decoded Data_R
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 V_EE
Output level ajustment selected by resistor to GND or V_EE
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 clock_R rising edge
3 S drive
5
SCDCT1698 REV A 6/12/98 Plainview NY [phone]