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UT63M147BPA Datasheet(PDF) 6 Page - Aeroflex Circuit Technology |
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UT63M147BPA Datasheet(HTML) 6 Page - Aeroflex Circuit Technology |
6 / 20 page Appendix 2 - 6 DATA BUS INTERFACE 1 The designer can connect the UT63M14x to the data bus via a short-stub (direct-coupling) connection or a long-stub (transformer-coupling) connection. Use a short-stub connection when the distance from the isolation transformer to the data bus does not exceed a one-foot maximum. Use a long-stub connection when the distance from the isolation transformer exceeds the one-foot maximum and is less than twenty feet. Figure 5 shows various examples of bus coupling configurations. The UT63M14x series transceivers are designed to function with MIL-STD-1553A and 1553B compatible transformers. Note: 1. The 24-lead flatpack internally connects TXOUT to RXIN and TXOUT to RXIN for each channel. RECOMMENDED THERMAL PROTECTION All packages should mount to or contact a heat removal rail located in the printed circuit board. To insure proper heat transfer between the package and the heat removal rail, use a thermally-conductive material between the package and the heat removal rail. Use a material such as Mereco XLN-589 or equivalent to insure heat transfer between the package and heat removal rail. Figure 8. Transceiver Test Circuit MIL-STD-1553B Figure 5. Bus Coupling Configuration 55 OHMS 55 OHMS 20 FT MAX 1:1.4 Note: ZO defined per MIL-STD-1553B, Section 4.5.1.5.2.1. ZO ZO +5V DC OPERATION 1:1.79 1:2.5 SHORT-STUB DIRECT COUPLING 1 FT. MAX. LONG-STUB TRANSFORMER COUPLING .75 ZO .75 ZO TXOUT RXIN RXIN TXOUT |
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