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參數(shù)資料
| 型號： | BU-63925G3-190 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CDSO70 |
| 封裝： | CERAMIC, GULL LEAD, 70 PIN |
| 文件頁數(shù)： | 30/48頁 |
| 文件大小： | 405K |
| 代理商： | BU-63925G3-190 |
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36
Data Device Corporation
www.ddc-web.com
BU-63825
C-02/06-0
INTERFACE TO MIL-STD-1553 BUS
FIGURE 18 illustrates the interface from the various versions of
the Sp’ACE II series terminals to a 1553 bus. The figure also indi-
cates connections for both direct (short stub) and transformer
(long stub) coupling, plus the peak-to-peak voltage levels that
appear at various points (when transmitting).
TABLE 33 lists the characteristics of the required isolation trans-
formers for the various Sp’ACE II terminals, the DDC and Beta
Transformer Technology Corporation corresponding part num-
ber, and the MIL (DESC) drawing number (if applicable). Beta
Transformer Technology Corporation is a direct subsidiary of
DDC.
For both coupling configurations, the isolation transformer is the
transformer that interfaces directly to the Sp’ACE II component.
For the transformer (long stub) coupling configuration, the trans-
former that interfaces the stub to the bus is the coupling trans-
former. The turns ratio of the isolation transformer varies,
depending upon the peak-to-peak output voltage of the specific
Sp’ACE II terminal.
The transmitter voltage of each model of the BU-63825 varies
directly as a function of the power supply voltage. The turns
ratios of the respective transformers will yield a secondary volt-
age of approximately 28 volts peak-to-peak on the outer taps
(used for direct coupling) and 20 volts peak-to-peak on the inner
taps (used for stub coupling).
In accordance with MIL-STD-1553B, the turns ratio of the cou-
pling transformer is 1.0 to 1.4. Both coupling configurations
require an isolation resistor to be in series with each leg con-
necting to the 1553 bus; this protects the bus against short cir-
cuit conditions in the transformers, stubs, or terminal compo-
nents.
TABLE 33. ISOLATION TRANSFORMER GUIDE
B-2388
M21038/27
-13,
B-2344,
M21038/27
-18
BUS-29854
1:0.83
SURFACE
MOUNT
B-2387
M21038/27
-12,
M21038/27
-17
LPB-5002
LPB-5009
LPB-6002
LPB-6009
LPB-5001
LPB-5008
LPB-6001
LPB-6008
RECOMMENDED XFORMER
PLUG-IN
BUS-25679,
B-2203,
M21038/27
-02
B-2204,
M21038/27
-03
XFORMER
COUPLED
2:1
1:0.67
1.25:1
(Note 5)
BU-63825X2
1.4:1
BU-63825X1
DIRECT
COUPLED
SP’ACE II
PART
NUMBER
TURNS RATIO
Notes for TABLE 33 and FIGURE 18:
(1) Shown for one of two redundant buses that interface to the BU-
63825
(2) Transmitted voltage level on 1553 bus is 6 Vp-p min, 7 Vp-p nomi-
nal, 9 Vp-p max.
(3) Required tolerance on isolation resistors is 2%. Instantaneous
power dissipation (when transmitting) is approximately 0.5 W (typ),
0.8 W (max).
(4) Transformer pin numbering is correct for the DDC (e.g., BUS-
25679) transformers. For the Beta transformers (e.g., B-2203) or
the QPL-21038-31 transformers (e.g., M21038/27-02), the winding
sense and turns ratio are mechanically the same, but with reversed
pin numbering; therefore, it is necessary to reverse pins 8 and 4 or
pins 7 and 5 for the Beta or QPL transformers (Note: DDC trans-
former part numbers begin with a BUS- prefix, while Beta trans-
former part numbers begin with a B- prefix).
(5) The B-2204, B-2388, and B-2344 transformers have a slightly differ-
ent turns ratio on the direct coupled taps then the turns ratio of the
BUS-29854 direct coupled taps. They do, however, have the same
transformer coupled ratio. For transformer coupled applications,
either transformer may be used. The transceiver in the BU-63825
was designed to work with a 1:0.83 ratio for direct coupled applica-
tions. For direct coupled applications, the 1.20:1 turns ration is rec-
ommended, but the 1.25:1 may be used. The 1.25:1 turns ratio will
result in a slightly lower transmitter amplitude. (Approximately 3.6%
lower) and a slight shift in the Sp’ACE II's receiver threshold.
See TABLE 34
1:2.5
1:1.79
BU-63825
X3/X6
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