ADI ADM2795E 5kVrms绝缘RS－485收发器解决方案

ADI公司的ADM2795E是5kVrms信号绝缘RS-485收发器.采用ADI公司的iCoupler®技术,集成了3路绝缘器,RS-485收发器和IEC电磁兼容(EMC)瞬态保护,IEC 61000-4-5 Level 4浪涌保护,RS-485总线引脚保护电压±4 kV,RS-485接口引脚保护高达±15 kV,工作温度−40°C到+125°C,主要用在加热,通风设备和空调(HVAC)网络,工业现场总线,建筑物自动化和公用事业网络.本文介绍了ADM2795E主要特性,框图,几种应用测试图以及评估板EVAL-ADM2795EEBZ主要特性,电路图,材料清单和PCB设计图.

The ADM2795E is a 5 kV rms signal isolated RS-485 transceiver that features up to ±42 V of ac／dc peak bus overvoltage fault protec-tion on the RS-485 bus pins. The device integrates Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator, RS-485 transceiver, and IEC electromagnetic compatibility (EMC) transient protection in a single package. The ADM2795E is a RS-485／RS-422 transceiver that integrates IEC 61000-4-5 Level 4 surge protection, allowing up to ±4 kV protection on the RS-485 bus pins (A and B). The device has IEC 61000-4-4 Level 4 EFT protection up to ±2 kV and IEC 61000-4-2 Level 4 ESD protection on the bus pins, allowing this device to withstand up to ±15 kV on the transceiver interface pins without latching up. This device has an extended common-mode input range of ±25 V to improve data communication reliability in noisy environments. The ADM2795E is capable of operating over wide power supply ranges, with a 1.7 V to 5.5 V VDD1 power supply range, allowing interfacing to low voltage logic supplies. The ADM2795E is also fully TIA／EIA RS-485／RS-422 compliant when operated over a 3 V to 5.5 V VDD2 power supply. The device is fully characterized over an extended operating temperature range of −40°C to +125°C, and is available in a 16-lead, wide-body SOIC package.

ADM2795E主要特性:

5 kV rms isolated RS-485／RS-422 transceiver

±42 V ac／dc peak fault protection on RS-485 bus pins

Certified Level 4 EMC protection on RS-485 A, B bus pins