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ADM4856AR Datasheet(PDF) 12 Page - Analog Devices |
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ADM4856AR Datasheet(HTML) 12 Page - Analog Devices |
12 / 16 page ADM4850–ADM4857 Rev. 0 | Page 12 of 16 CIRCUIT DESCRIPTION The ADM4850–ADM4857 are high speed RS-485/RS-422 transceivers offering enhanced performance over industry- standard devices. All devices in the family contain one driver and one receiver, but offer a choice of performance options. The devices feature true fail-safe operation, which means that a logic high receiver output is guaranteed when the receiver inputs are open-circuit or short-circuit, or when they are connected to a terminated transmission line with all drivers disabled (see the Fail-Safe Operation section). SLEW-RATE CONTROL The ADM4850/ADM4854 feature a controlled slew-rate driver that minimizes electromagnetic interference (EMI) and reduces reflections caused by incorrectly terminated cables, allowing error-free data transmission rates up to 115 kbps. The ADM4851/ ADM4855 offer a higher limit on driver output slew rate, allowing data transmission rates up to 500 kbps. The driver slew rates of the ADM4852/ADM4856 and the ADM4853/ADM4857 are not limited, offering data transmission rates up to 2.5 Mbps and 10 Mbps, respectively. RECEIVER INPUT FILTERING The receivers of all the devices incorporate input hysteresis. In addition, the receivers of the 115 kbps ADM4850/ADM485 and the 500 kbps ADM4851/ADM4855 incorporate input filtering. This enhances noise immunity with differential signals that have very slow rise and fall times. However, it causes the propagation delay to increase by 20%. HALF-/FULL-DUPLEX OPERATION Half-duplex operation implies that the transceiver can transmit and receive, but it can only do one of these at any given time. However, with full-duplex operation, the transceiver can transmit and receive simultaneously. The ADM4850–ADM4853 are half-duplex devices in which the driver and receiver share differential bus terminals. The ADM4854–ADM4857 are full- duplex devices, which have dedicated driver output and receiver input pins. Figure 26 and Figure 27 show typical half- and full- duplex topologies. RO RE DE DI D R A B MAXIMUM NUMBER OF TRANSCEIVERS ON BUS: 256 RO RE DE DI D R A B R D RO RE DE DI AB R D RO RE DE DI AB ADM4850/ADM4851/ ADM4852/ADM4853 ADM4850/ADM4851/ ADM4852/ADM4853 Figure 26. Typical Half-Duplex RS-485 Network Topology GND RO DI D R A B RO DI D A B Z Y R GND VDD VDD Z Y ADM4854/ADM4855/ ADM4856/ADM4857 ADM4854/ADM4855/ ADM4856/ADM4857 Figure 27. Typical Full-Duplex Point-to-Point RS-485 Network Topology |
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