ADM2485

NOT RECOMMENDED FOR NEW DESIGNS

2.5 kV Signal Isolated, High Speed (16 Mbps), Half Duplex RS-485 Transceiver w/ Transformer Driver

Data Sheet (Rev. B) Product Selection Table

Part Models: 2
1ku List Price: Starting From $4.94

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Overview

Half-duplex, isolated RS-485 transceiver
Integrated oscillator driver for external transformer
PROFIBUS^® compliant
Complies with ANSI/TIA/EIA RS-485-A-98 and ISO 8482:1987(E)
Data rate: 16 Mbps
5 V or 3.3 V operation (V_DD1)
High common-mode transient immunity: >25 kV/μs
Wide-body, 16-lead SOIC package
50 nodes on bus

Isolated DE OUT status output
Thermal shutdown protection
Safety and regulatory approvals
- UL recognition: 2500 V rms for 1 minute per UL 1577
- VDE Certificate of Conformity
  - DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
  - Reinforced insulation, V_IORM = 560 V peak
Operating temperature range: –40°C to +85°C
Wide-body, 16-lead SOIC package

The ADM2485 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines and complies with ANSI/TIA/EIA RS-485-A-98 and ISO 8482:1987(E).

The device employs 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 with an external transformer. 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 5 V supply.

The ADM2485 driver has an active high enable. The driver differential outputs and the receiver differential inputs are connected internally to form a differential input/output port that imposes minimal loading on the bus when the driver is disabled or when V_DD1 or V_DD2 = 0 V. Also provided is an active high receiver disable that causes the receive output to enter a high impedance state.

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 and is available in a 16-lead, wide-body SOIC package.

Applications

Isolated RS-485/RS-422 interfaces
PROFIBUS networks
Industrial field networks
Multipoint data transmission systems

Part Models: 2
1ku List Price: Starting From $4.94

Documentation

Frequently Asked Question 1

FAQ 05/17/2017

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADM2485BRWZ	16-Lead SOIC Wide	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADM2485BRWZ-REEL7	16-Lead SOIC Wide	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Mar 21, 2025 - 25_0078 ADM2485 Die and Data Sheet Revision
		PCN25_0078_Form Material_Report Datasheet Specification Comparison Qualification Results Summary
ADM2485BRWZ	PRODUCTION
ADM2485BRWZ-REEL7	PRODUCTION
Mar 13, 2024 - 23_0069 Qualification Notification of Alternate Wafer Fab Site at ADI Limerick for Select Isolator Products
		PCN23_0069_Form Material_Report Qualification Results Summary Delta Qualification Matrix Qualification Results Summary
ADM2485BRWZ	PRODUCTION
ADM2485BRWZ-REEL7	PRODUCTION
Sep 22, 2015 - 15_0135 Alternate Assembly Site of Select Isolator Products in 8L/16L SOIC_N, 16L/20L SOIC_W and 16L/20L SOIC_IC at ASE Chungli
		PCN15_0135_Form Material_Report Detailed Change Description Qualification Results Summary
ADM2485BRWZ	PRODUCTION
ADM2485BRWZ-REEL7	PRODUCTION
Apr 22, 2015 - 14_0173 Qualification of Alternate Fab Foundry at Analog Devices, Limerick for IC and TC die in Isolator RS-485 Transceivers
		PCN14_0173_Form Material_Report Qualification Results Summary Flow Chart
ADM2485BRWZ	PRODUCTION
ADM2485BRWZ-REEL7	PRODUCTION
Feb 27, 2012 - 11_0066 Qualification of Alternate Fab Foundry Gold Plating Process Site for Isolation Products at ADI Limerick.
		PCN11_0066_Form Material_Report Qualification Plan Summary Flow Chart
ADM2485BRWZ	PRODUCTION
ADM2485BRWZ-REEL7	PRODUCTION
Aug 4, 2010 - 10_0117 Halogen Free Material Change for SOIC_W Products at Carsem
		PCN10_0117_Form Material_Report Reliability Report
ADM2485BRWZ	PRODUCTION
ADM2485BRWZ-REEL7	PRODUCTION
Dec 21, 2009 - 06_0159 Qualification of 8" S6 wafer fab process at Analog Devices, Limerick, Ireland.
		Material_Report PCN06_0159_Form RQR03910S
ADM2485BRWZ	PRODUCTION
ADM2485BRWZ-REEL7	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
MAX14940	RECOMMENDED FOR NEW DESIGNS	2.75kV_RMS Isolated 20Mbps Half-Duplex PROFIBUS/RS-485 Transceiver with ±35kV ESD Protection and Integrated Transformer Driver

Evaluation Kits

ADM2485 Evaluation Board

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Product Details

The ADM2485 evaluation board allows the ADM2485 isolated RS-485 transceiver 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. When the ADM2485 is powered by 3.3 V on the logic side, a transformer, TI, is required with a turns ratio of 1:2.2 (DA2304_AL) to step up the 3.3 V to 6 V. This ensures that there is enough headroom for the ADP667 LDO to output a regulated 5 V output (EVAL-ADM2485EB3Z).

If the ADM2485 is powered by 5 V on the logic side, a trans-former, TI, is required with a turns ratio of 1:1.5 (DA2303_AL) so that there is enough headroom for the ADP667 LDO to output a regulated 5 V output (EVAL-ADM2485EB5Z).