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HCPL-4200 датащи(PDF) 9 Page - Agilent(Hewlett-Packard) |
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HCPL-4200 датащи(HTML) 9 Page - Agilent(Hewlett-Packard) |
9 / 12 page 1-331 Figure 14. Typical Logic High Enable Propagation Delay vs. Temperature. Figure 15. Typical Logic Low Enable Propagation Delay vs. Temperature. Figure 16. Test Circuit for Common Mode Transient Immunity. Applications Data transfer between equipment which employs current loop circuits can be accomplished via one of three configurations: simplex, half duplex or full duplex communication. With these configurations, point-to- point and multidrop arrangements are possible. The appropriate configuration to use depends upon data rate, number of stations, number and length of lines, direction of data flow, protocol, current source location and voltage compliance value, etc. Simplex The simplex configuration, whether point to point or multi- drop, gives unidirectional data flow from transmitter to receiver(s). This is the simplest configuration for use in long line length (two wire), for high data rate, and low current source compliance level applications. Block diagrams of simplex point- to-point and multidrop arrangements are given in Figures 17a and 17b respectively for the HCPL-4200 receiver optocoupler. For the highest data rate per- formance in a current loop, the configuration of a non-isolated active transmitter (containing current source) transmitting data to a remote isolated receiver(s) should be used. When the current source is located at the trans- mitter end, the loop is charged approximately to VMI (2.5 V). Alternatively, when the current source is located at the receiver end, the loop is charged to the full compliance voltage level. The lower the charged voltage level the faster the data rate will be. In the configurations of Figures 17a and 17b, data rate is independent of the current source voltage compliance level. An adequate compliance level of current source must be available for voltage drops across station(s) during the MARK state in multi- drop applications or for long line length. The maximum compliance level is determined by the trans- mitter breakdown characteristic. A recommended non-isolated active transmitter circuit which can be used with the HCPL-4200 in point-to-point or in multidrop 20 mA current loop applications is given in Figure 18. The current source is controlled via a standard TTL 7407 buffer to provide high output impedance of current source in both the ON |
Аналогичный номер детали - HCPL-4200 |
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Аналогичное описание - HCPL-4200 |
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