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ADM3071EARZ Datasheet(PDF) 17 Page - Analog Devices |
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ADM3071EARZ Datasheet(HTML) 17 Page - Analog Devices |
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ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E Rev. E | Page 17 of 20 LOW POWER SHUTDOWN MODE (ALL EXCEPT ADM3071E/ADM3074E/ADM3077E) Low power shutdown mode is initiated by bringing both RE high and DE low. In shutdown mode, the device draws less than 1 μA of supply current. RE and DE can be driven simulta- neously, but the parts are guaranteed not to enter shutdown if RE is high and DE is low for fewer than 50 ns. If the inputs are in this state for 600 ns or more, the parts are guaranteed to enter shutdown. Enable times tZH and tZL assume that the part was not originally in a low power shutdown state (see the section). Enable times (tZH(SHDN) and tZL(SHDN)) assume that the part was originally shut down. It takes drivers and receivers longer to become enabled from low power shutdown mode (tZH(SHDN), tZL(SHDN)) than from driver/ receiver disable mode (tZH, tZL). Test Circuits and Switching Characteristics DRIVER OUTPUT PROTECTION The ADM307xE family features two methods to prevent excessive output current and power dissipation caused by faults or by bus contention. Current limit protection on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see Figure 22 and Figure 23). In addition, a thermal shutdown circuit forces the driver outputs into a high impedance state if the die temperature rises excessively. TYPICAL APPLICATIONS The ADM3072E/ADM3075E/ADM3078E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figure 34 shows a typical network applications circuit. The ADM3071E/ADM3074E/ADM3077E transceivers are designed for point-to-point transmission lines (see Figure 35). The ADM3070E/ADM3073E/ADM3076E transceivers are designed for full-duplex RS-485 networks (see Figure 36). To minimize reflections, terminate the line at both ends with a termination resistor (the value of the termination resistor should be equal to the characteristic impedance of the cable used) and keep stub lengths off the main line as short as possible. B A R D RO DI DE ADM3072E/ ADM3075E/ ADM3078E ADM3072E/ ADM3075E/ ADM3078E ADM3072E/ ADM3075E/ ADM3078E ADM3072E/ ADM3075E/ ADM3078E B A R D RO DI DE B A R D RO RE DI DE B A R D RO RE DI DE RT RT NOTES 1. MAXIMUM NUMBER OF NODES: 256. 2. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE USED. RE RE Figure 34. ADM3072E/ADM3075E/ADM3078E Typical Half-Duplex RS-485 Network B A R D RO DI RO DI Y Z B A Y Z MASTER R D SLAVE ADM3071E/ ADM3074E/ ADM3077E ADM3071E/ ADM3074E/ ADM3077E Figure 35. ADM3071E/ADM3074E/ADM3077E Full-Duplex Point-to-Point Applications |
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