The ADM2209E is a complete， dual RS-232 port on a single chip， containing six drivers and ten receivers and fully meeting EIA-232 and V.28 specifications. The device features an onboard dc-to-dc converter to generate a –12 V power rail， eliminating the need for a negative power supply. The ADM2209E is suitable for operation in harsh electrical environments and is compliant with the EU directive on EMC （89/336/EEC）。 Both the level of emissions and immunity are in compliance. EM immunity includes ESD protection in excess of ±15 kV on all I-O lines （1000-4-2）， Electrical Fast Transient protection （1000-4-4） and Radiated Immunity （1000-4-3）。 EM emissions include radiated and conducted emissions as required by Information Technology Equipment EN55022， CISPR22. The ADM2209E conforms to the EIA-232E and CCITT V.28 specifications and operates at data rates up to 460 kbps.