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ADM483EARZ Datasheet(PDF) 11 Page - Analog Devices |
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ADM483EARZ Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page ADM483E Rev. A | Page 11 of 16 GENERAL INFORMATION The ADM483E is a robust RS-485 transceiver that operates from a single 5 V supply. It is ideally suited for operation in electrically harsh environ- ments or where cables may be plugged and unplugged. It is also immune to high RF field strengths without special shielding precautions. The ADM483E is intended for balanced data transmission and complies with both EIA Standards RS-485 and RS-422. It contains a differential line driver and a differential line receiver; it is suitable for half-duplex data transmission because the driver and receiver share the same differential pins. The input impedance on the ADM483E is 12 kΩ, allowing up to 32 transceivers on the differential bus. The ADM483E operates from a single 5 V ± 10% power supply. Excessive power dissipation caused by bus contention or by output shorting is prevented by a thermal shutdown circuit. This feature forces the driver output into a high impedance state if, during fault conditions, a significant temperature increase is detected in the internal driver circuitry. The receiver has a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). A high level of robustness is achieved using internal protection circuitry, eliminating the need for external protection components such as transorbs or surge suppressors. Low electromagnetic emissions are achieved using slew limited drivers, minimizing interference both conducted and radiated. The ADM483E can transmit at data rates up to 250 kbps. A typical application for the ADM483E is illustrated in Figure 23. This figure shows a half-duplex link where data may be transferred at rates up to 250 kbps. A terminating resistor is shown at both ends of the link. This termination is not critical because the slew rate is controlled by the ADM483E and reflections are minimized. The communications network can be extended to include multipoint connections as shown in Figure 26. Up to 32 transceivers can be connected to the bus. E 3 8 4 M D A E 3 8 4 M D A RS-485/RS-422 LINK RO DI DE DI DE B A GND B A GND RO 0.1µF 0.1µF +5V +5V VCC VCC RE RE Figure 23. Typical Half-Duplex Link Application Table 6 and Table 7 show the truth tables for transmitting and receiving. Table 6. Transmitting Truth Table Inputs Outputs RE DE DI B A X1 1 1 0 1 X1 1 0 1 0 0 0 X1 High-Z High-Z 1 0 X1 High-Z High-Z 1 X = don’t care. Table 7. Receiving Truth Table Inputs Outputs RE DE A − B RO 0 0 ≥ +0.2 V 1 0 0 ≤ −0.2 V 0 0 0 Inputs O/C 1 1 0 X1 High-Z 1 X = don’t care. ESD TRANSIENT PROTECTION SCHEME The ADM483E uses protective clamping structures on its inputs and outputs that clamp the voltage to a safe level and dissipate the energy present in ESD (electrostatic discharge). The protection structure achieves ESD protection up to ±15 kV according to the Human Body Model. |
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