Features and Benefits
- Isolated RS-485/RS-422 transceiver, configurable as half or full duplex
- Integrated oscillator driver for external transformer
- ±15 kV ESD protection on RS485 input/output pins
- Complies with TIA/EIA-485-A-98 and ISO 8482:1987(E)
- Data rate: 500 kbps
- 5 V or 3.3 V operation (VDD1)
- 256 nodes on bus
- True fail-safe receiver inputs
- Safety and regulatory approvals
- UL recognition: 2500 V rms for 1 minute per UL 1577
- VDE certificates of conformity
- DIN VVDE V 0884-10 (VDE V 0884-10):2006-12
- VIORM = 560 V peak
- Thermal shutdown protection
- Operating temperature range: −40°C to +85°C
- Wide-body, 16-lead SOIC package
The ADM2482E/ADM2487E are isolated data transceivers with ±15 kV ESD protection and are suitable for high speed, half-duplex or full-duplex communication on multipoint transmission lines. For half-duplex operation, the transmitter outputs and receiver inputs share the same transmission line. Transmitter Output Pin Y is linked externally to Receiver Input Pin A, and Transmitter Output Pin Z to Receiver Input Pin B. The parts are designed for balanced transmission lines and comply with TIA/EIA- 485-A-98 and ISO 8482:1987(E).
The devices employ the Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. An on-chip oscillator outputs a pair of square waveforms that drive an external transformer to provide isolated power. The logic side of the device can be powered with either a 5 V or a 3.3 V supply, and the bus side is powered with an isolated 3.3 V supply.
The ADM2482E/ADM2487E driver has an active high enable, and the receiver has an active low enable. The driver output enters a high impedance state when the driver enable signal is low. The receiver output enters a high impedance state when the receiver enable signal is high.
The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention might cause excessive power dissipation. The part is fully specified over the industrial temperature range of −40°C to +85°C and is available in a 16-lead, wide-body SOIC package.
- Isolated RS-485/RS-422 interfaces
- Industrial field networks
- Multipoint data transmission systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The ADM2487E evaluation board allow the ADM2482E/ADM2487E isolated RS-485 transceivers to be quickly and easily evaluated. The evaluation board allows all of the input and output functions to be exercised without the need for external components.
The ADM2487E feature an integrated transformer driver that outputs a pair of square waves to an external transformer to provide isolated power. When the ADM2487E is powered by 3.3 V on the logic side (VDD1), a transformer, U3, is required with a turns ratio of 1:1.5 (DA2303-AL). This ensures that there is enough headroom for the ADP3330 LDO to output a regulated 3.3 V output (EVAL-ADM2482EEB3Z and EVAL-ADM2487EEB3Z).
When the ADM2487E is powered by 5 V on the logic side, a transformer, U3, is required with a turns ratio of 1:1 (GA3157-AL) to give a 5 V input for the ADP3330, which regulates an output of 3.3 V output (EVAL-ADM2482EEB5Z and EVAL-ADM2487EEB5Z).
Safety and Regulatory Compliance (1)
Product Selection Guide (1)
Press Releases (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.