ADM3251EARWZ-REEL UART Interface IC Digital Isolators Iso SGL CH Line Dvr/Rcvr

FEATURES

• 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 RIN and TOUT 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
• DIN EN 60747-5-2 (VDE 0884 Teil 2): 2003-01
• CSA Component Acceptance Notice #5A Operating temperature range: −40°C to +85°C Wide body, 20-lead SOIC package

APPLICATIONS

• High noise data communications
• Industrial communications
• General-purpose RS232 data links Industrial/telecommunications diagnostic ports Medical equipment

GENERAL DESCRIPTION

The ADM3251E1 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 isoPowerTM integrated, isolated power. There is no requirement to use a separate isolated dc-to-dc converter. Chip-scale trans- former 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 the

1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. transformer. 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.