Terminal
TRANSCEIVER
UNDER TEST
TX DATA OUT
RX DATA IN
RX DATA OUT
RX DATA OUT
Isolation
Transformer
1:N
Coupling
Transformer
1 : 1.414
R
Zo
B
Isolation
Resistors
R = 0.75 Z
O
A
B'
TX DATA OUT
RX DATA IN
R
Data
Bus
Wire
Pair
A'
Zo
INT INT
RX RX
EXT EXT
RX RX
NC
NC
Transformer turns ratio:
N = 0.707
Recommend Technitrol 1553-1
NOTE: Internal RX Threshold
Wiring Shown
Terminal Input Impedance B – B'
MIL-STD-1553B para 4.5.2.1.2.3
1K
Ω
minimum. 75KHz – 1MHz
FIGURE 3 – DATABUS INTERFACE USING TRANSFORMER COUPLING
(FIGURE 9, MIL-STD-1553B)
Terminal
TRANSCEIVER
UNDER TEST
TX DATA OUT
RX DATA IN
RX DATA OUT
RX DATA OUT
Isolation
Transformer
1:N
55Ω
Zo
B
A
B'
TX DATA OUT
RX DATA IN
55Ω
Data
Bus
Wire
Pair
A'
Zo
INT
RX
NC
INT
RX
NC
EXT EXT
RX RX
R
R
NOTE: External RX Threshold Wiring
Shown – R < 10K Ohms.
Transformer turns ratio:
N=1
Recommend Technitrol 1553-1
Terminal Input Impedance B – B'
MIL-STD-1553B para 4.5.2.2.2.3
2K
Ω
minimum. 75KHz – 1MHz
FIGURE 4 – DATABUS INTERFACE USING DIRECT COUPLING
(FIGURE 10, MIL-STD-1553B)
SCD4404N Rev D 12/19/07
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6
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
