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LTC2873 Fiches technique(PDF) 22 Page - Analog Devices |
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LTC2873 Fiches technique(HTML) 22 Page - Analog Devices |
22 / 32 page LTC2873 22 REV B For more information www.analog.com APPLICATIONS INFORMATION Logic Loopback Aloopbackmodeconnectsthedriverinputstothereceiver outputs(non-inverting)providinganechoforself-test.This applies to both RS232 and RS485 transceivers. Loopback mode is entered when the LB pin is set to a logic-high and the relevant receiver is enabled. The RS485 driver output can be disabled in loopback mode if DE485/F232 is held low, or functions normally with DE485/F232 high. The RS232 driver output cannot be disabled when loopback is engaged in RS232 mode, and functions normally. The loopback signal traverses a path from the logic input cir- cuit at DI to the logic output at RO and does not exercise the entire driver or receiver circuit. Thus loopback, alone, is not a sufficient test to ensure full functionality of the LTC2873. Loopback does not affect the operation of the termination resistors. Robust ESD Protection TheLTC2873featuresexceptionallyrobustESDprotection. The transceiver interface pins (A and B) are protected to ±26kV human body model with respect to GND, VCC, or VL without latchup or damage. This protection holds whether the device is unpowered or powered in any mode of opera- tion. To note, ±26kV is an upper limit of the tester—the actual device protection level is higher. Every other pin on the device is protected to ±4kV ESD (HBM) for all-around robustness. Figure 22 shows the LTC2873 being struck repeatedly with 26kV of ESD energy (air gap discharge) during operation with no damage or circuit latchup. RS485 Cable Length vs Data Rate Many factors contribute to the maximum cable length that can be used for RS485 or RS422 communication, including driver transition times, receiver threshold, duty Figure 22. LTC2873 Struck Repeatedly with 26kV of ESD Energy While Operating. No Damage or Circuit Latchup Occurs |
Numéro de pièce similaire - LTC2873 |
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Description similaire - LTC2873 |
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