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50
Data Device Corporation
www.ddc-web.com
BU-65743/65843/65863/65864
D-06/04-0
B-3372/LVB-4203
B-3383/LVB-4103
Single epoxy transformer, through-hole, transformer coupled, 0.625" X 0.630", 0.300" max height,
+130 deg C max
Single epoxy transformer, through-hole, direct coupled, 0.625" X 0.630", 0.300" max height,
+130 deg C max
BTTC PART NO.
TRANSFORMER CONFIGURATION
TABLE 65. BTTC TRANSFORMERS FOR USE WITH BU-65743X8(9), BU-65843X8(9), BU-65863X8(9)
B-3390/LVB-4113
B-3389/LVB-4213
Single epoxy transformer, surface mount, direct coupled, 0.625" X 0.625", 0.130" max height,
+85 deg C max
Single epoxy transformer, surface mount, transformer coupled, 0.625" X 0.625", 0.130" max height,
+85 deg C max
B-3392/LVB-4123
B-3391/LVB-4223
Single epoxy transformer, surface mount, direct coupled, 0.625" X 0.625", 0.300" max height,
+130 deg C max
Single epoxy transformer, surface mount, transformer coupled, 0.625" X 0.625", 0.300" max height,
+130 deg C max
NOTE: SMT body package size (a” x b”) does NOT include SMT leads
INTERFACE TO MIL-STD-1553 BUS
(PCI MINI-ACE MARK3/PCI MICRO-ACE TE WITH 5V
TRANSCEIVER OPTION)
FIGURE 19 illustrates the interface between the PCI Mini-ACE
Mark3/PCI Micro-ACE TE with 5V transceiver option, and a MIL-
STD-1553 bus. Connections for both direct (short stub) and
transformer (long stub) coupling, as well as the peak to peak
voltage levels at various points (when transmitting), are indicat-
ed in the diagram.
5V TRANSFORMERS
In selecting 5V isolation transformers to be used with the PCI
Mini-ACE Mark3/Micro-ACE TE, there is a limitation on the max-
imum amount of leakage inductance. If this limit is exceeded, the
transmitter rise and fall times may increase, possibly causing the
bus amplitude to fall below the minimum level required by MIL-
STD-1553. In addition, an excessive leakage inductance imbal-
ance may result in a transmitter dynamic offset that exceeds
1553 specifications.
The maximum allowable leakage inductance is 6.0uH. It is mea-
sured as follows:
Defining the side of the transformer that connects to the device
as the "primary" winding, if one side of the primary is shorted to
the primary center-tap, the inductance should be measured
across the "secondary" (stud side) winding. This inductance
must be less than 6.0uH. Similarly, if the other side of the prima-
ry is shorted to the primary center-tap, the inductance measured
across the "secondary" (stub side) winding must also be less
than 6.0uH.
The difference between those two measurement is the "differen-
tial" leakage inductance. This value must be less than 1.0uH.
Beta Transformer Technology Corporation (BTTC), a subsidiary
of DDC, manufactures 5V transformers in a variety of mechani-
cal configurations with the required turns ratios of 1:2.5 direct
coupled, and 1:1.79 transformer coupled.
For further information, contact BTTC at 631-244-7393 or at
www.bttc-beta.com.