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In this article, we will introduce the isolated RS-485 transceiver, which is a new product from Analog Devices.
The ADM2795E is a 5kV rms signal isolated RS-485 transceiver with up to ±42V ac/dc peak bus overvoltage fault protection on the RS-485 bus terminals. This product uses Analog Devices' iCoupler® technology, which combines a 3-channel isolated RS-485 transceiver and IEC electromagnetic compatibility (EMC) overload protection in a single package.
The ADM2795E is an RS-485/RS-422 transceiver with integrated IEC 61000-4-5 Level 4 surge protection capable of protection up to ±4kV on the RS-485 bus terminals (A and B) .
The device features up to ±2 kV IEC 61000-4-4 Level 4 EFT protection and IEC 61000-4-2 Level 4 ESD protection on the bus terminals and ±15 kV without latch-up on the transceiver interface terminals. It can withstand up to In addition, an extended ±25V common-mode input range improves data communications reliability in noisy environments.
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Certified IEC EMC Performance Overview
Communication ports for industrial automation programmable logic controllers (PLCs) using RS-485 interfaces are susceptible to high common-mode noise, ground potential differences, miswiring failures, electrostatic discharge (ESD), and electrical high speed (EFT) , may be affected by lightning surges, etc. System-level IEC standards, such as IEC61131-2 for industrial automation, specify IEC ESD, EFT, and surge protection levels, as well as radiated, conducted, and porcelain immunity. To comply with these standards, the ADM2795E is IEC EMC certified as listed below.
RS-485 A/Bバス・ピンでレベル4のEMC保護認定
- IEC 61000-4-5 サージ保護（±4kV）
- IEC 61000-4-4 EFT保護（±2kV）
- IEC 61000-4-2 ESD保護
- ±8kVの接触放電
- ±15kVの空気放電
Certified to IEC 61000 resistance across the insulation barrier
- IEC 61000-4-2 ESD
- IEC 61000-4-4 EFT
- IEC 61000-4-5サージ
- IEC 61000-4-6 RF伝導耐性
- IEC 61000-4-3 放射性耐性
- IEC 61000-4-8磁気耐性
Assumed target application
ADM2795Eを使用する際に想定するアプリケーションの例としては下記があります。
- Heating, Ventilation, and Air Conditioning (HVAC) Network
- 工業用フィールド・バス
- building automation
- utility network
開発初期段階からの検討が重要
In industrial applications, RS-485 communication ports that are exposed to a variety of transient phenomena can be damaged. Failure to consider EMC countermeasures and problems discovered late in the design cycle often results in design changes and schedule overruns. For this reason, it is best to address EMC issues early in the design cycle. There are various methods for EMC countermeasures, but why not try using the ADM2795E as one method?
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