ADM3251E Isolated Single Channel RS-232 Line Driver/Receiver

High noise data communications Industrial communications General-purpose RS-232 data links Industrial/telecommunications diagnostic ports Medical equipment

The ADM3251E is a high speed, 2.5 kV fully isolated, single- channel RS-232/V.28 transceiver device that operates from a single 5 V power supply. Due to the high ESD protection on the RIN and TOUT pins, the device is ideally suited for operation in electrically harsh environments or where RS-232 cables are frequently being plugged and unplugged.

The ADM3251E incorporates dual-channel digital isolators with isoPower™ integrated, isolated power. There is no requirement to use a separate isolated dc-to-dc converter. Chip-scale transformer iCoupler® technology from Analog Devices, Inc., is used both for the isolation of the logic signals as well as for the inte- grated dc-to-dc converter. The result is a total isolation solution.

The ADM3251E contains isoPower technology that uses high frequency switching elements to transfer power through thetransformer. Special care must be taken during printed circuit board (PCB) layout to meet emissions standards. Refer to Application Note AN-0971, Control of Radiated Emissions with isoPower Devices, for details on board layout considerations. The ADM3251E conforms to the EIA/TIA-232E and ITU-T V. 28 specifications and operates at data rates up to 460 kbps. Four external 0.1 μF charge pump capacitors are used for the voltage doubler/inverter, permitting operation from a single 5 V supply.

The ADM3251E is available in a 20-lead, wide body SOIC package and is specified over the −40°C to +85°C temperature range.

Applications

Features and Benefits

2.5 kV fully isolated (power and data) RS-232 transceiver
isoPower integrated, isolated dc-to-dc converter
460 kbps data rate
1 Tx and 1 Rx
Meets EIA/TIA-232E specifications
ESD protection on R_IN and T_OUT pins
±8 kV: contact discharge
±15 kV: air gap discharge
0.1 μF charge pump capacitors

High common-mode transient immunity: >25 kV/μs
Safety and regulatory approvals
UL recognition
2500 V rms for 1 minute per UL 1577
VDE Certificate of Conformity (pending)
DIN EN 60747-5-2 (VDE 0884 Teil 2): 2003-01
CSA Component Acceptance Notice #5A (pending)
Operating temperature range: −40°C to +85°C
Wide body, 20-lead SOIC package

Interface & Isolation

Isolated RS-232

Building Technology

Heating Ventilation and Air Conditioning
LED General Lighting

Security and Surveillance

Access Control
Scanning Equipment
Video Surveillance

Data Sheets

Document	note
ADM3251E: Isolated, Single-Channel RS-232 Line Driver/Receiver Data Sheet (Rev. G)	PDF 266 kB

User Guides

Document	note
UG-181: PLC Demo System, Industrial Process Control Demo System (Rev. A)	PDF 495.24 K
UG-124: EMI optimized evaluation kit user guide for the ADM3251E	PDF 191 kB
UG-120: Standard Evaluation Kit User Guide for the ADM3251E	PDF 158 kB