HI-2579, HI-2581
MIL-STD-1553
BUS A
(Direct Coupled)
Isolation
Transformer
BUSA
55Ω
Transceiver A
BUSA
1:2.5
55Ω
MIL-STD-1553
BUS B
(Transformer Coupled)
Isolation
Transformer
MIL-STD-1553
Stub Coupler
BUSB
52.5Ω
Transceiver B
BUSB
1:2.5
1:1.4
52.5Ω
HI-2579
Figure 3. Bus Connections Example using HI-2579
VDD
Each Bus
Isolation
Transformer
TXA/B
TXA/B
RXA/B
RXA/B
BUSA/B
55Ω
MIL-STD-1553
Transceiver
BUSA/B
55Ω
35Ω
HI-2579
GND
Point
“AD”
Figure 4. Direct Coupled Test Circuit
VDD
Each Bus
Isolation
Transformer
TXA/B
TXA/B
RXA/B
RXA/B
BUSA/B
70Ω
MIL-STD-1553
Transceiver
BUSA/B
HI-2579
GND
Point
“AT”
Figure 5. Transformer Coupled Test Circuit
HOLT INTEGRATED CIRCUITS
7