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參數(shù)資料
| 型號： | BU-62843F3-200Q |
| 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, CQFP72 |
| 封裝： | 1 INCH, CERAMIC, QFP-72 |
| 文件頁數(shù)： | 84/99頁 |
| 文件大小： | 578K |
| 代理商： | BU-62843F3-200Q |
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Data Device Corporation
62743_pre7_noSA-DB.DOC
www.ddc-web.com
8-07-02
85
TRANSFORMERS
In selecting isolation transformers to be used with the PCI Enhanced Mini-ACE,
there is a limitation on the maximum 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 imbalance may result in a transmitter
dynamic offset that exceeds 1553 specifications.
The maximum allowable leakage inductance is 6.0uH. It is measured as follows:
Defining the side of the transformer that connects to the PCI Enhanced Mini-
ACE 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 primary 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 “differential” leakage
inductance. This value must be less than 1.0uH.
Beta Transformer Technology Corporation (BTTC), a subsidiary of DDC,
manufactures transformers in a variety of mechanical configurations with the
required turns ratios of 1:2.5 direct coupled, and 1:1.79 transformer coupled.
Table 65
provides a listing of many of these transformers.
NOTES:
1. For the BU-6XXXXX4 versions of the PCI Enhanced Mini-ACE, which include
the McAir-compatible transceivers, only the B-3818 or B-3819 transformers
(shown in bold in the table) may be used.
2. For the BU-6XXXXX3 versions of the PCI Enhanced Mini-ACE with –1553B
transceivers, any of the transformers listed in the table may be used.
For further information, contact BTTC at 631-244-7393 or at www.bttc-beta.com.
Table 65. BTTC Transformers for Use with Enhanced Mini-ACE
Transformer Configuration
BTTC Part No.
Single epoxy transformer, through-hole, 0.625 X 0.625, 0.250” max height
B-3226
Single epoxy transformer, through-hole, 0.625 X 0.625, 0.220” max height. May be
used with BU-6XXXXX4 versions of the Enhanced Mini-ACE.
B-3818
Single epoxy transformer, flat pack, 0.625” X 0.625”, 0.275” max height
B-3231
Single epoxy transformer, surface mount, 0.625” X 0.625”, 0.275” max height
B-3227
Single epoxy transformer, surface mount, hi-temp solder, 0.625” X 0.625”, 0.220”
max height. May be used with BU-6XXXXX4 versions of the Enhanced Mini-ACE.
B-3819
Single epoxy transformer, flat pack, 0.625” X 0.625”, 0.150” max height
LPB-5014
Single epoxy transformer, surface mount, 0.625” X 0.625”, 0.150” max height
LPB-5015
Dual epoxy transformer, twin stacked, 0.625” X 0.625”, 0.280” max height
TST-9007
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