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