Isolated Single Channel RS-232 Line Driver/Receiver
(ADM3251E)
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 un-
plugged.
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 trans-former iCoupler® technology from Ana-
log 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 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.
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 tem-
perature range.
Isolated, Dual Channel RS-232 Line Driver/Receiver
(ADM3252E)
The ADM3252E is a high speed, 2.5 kV, fully isolated, dual- channel RS-232/V.28 transceiver device that is opera-
tional from a single 3.3 V or 5 V power supply. Because of high ESD protection on the RIN1, RIN2, TOUT1, and
TOUT2 pins, the ADM3252E is ideally suited for operation in electrically harsh environments or where RS-232
cables are frequently plugged and unplugged.
The ADM3252E provides four independent isolation channels using the integrated and isolated power of isoPow-
er™. There is no requirement to use a separate isolated dc-to-dc converter. Chip scale transformer iCoupler® tech-
nology from Analog Devices, Inc., is used for both the isolation of the logic signals and the integrated dc-to-dc con-
verter. The result is a total isolation solution.
isoPower technology in the ADM3252E uses high frequency switching elements to transfer power through its trans-
former. Special care must be taken during printed circuit board (PCB) layout to meet emissions standards. Refer to
the AN-0971 Application Note, Recommendations for Control of Radiated Emissions with isoPower Devices, for
details on board layout considerations.
Isolated Single Channel RS-232 Line Driver/Receiver (ADM3251E)
2–10
ADSP-CM419F EZ-KIT
®
Manual
