Isolated, Dual Channel, RS-232 Line
Driver/Receiver
ADM3252E
Data Sheet
FUNCTIONAL BLOCK DIAGRAM
C1
0.1µF
16V
C3
0.1µF
10V
C1+ C1– V+
ADM3252E
0.1µF
VCC
10µF
2.5 kV fully isolated (power and data) RS-232 transceiver
isoPower integrated, isolated dc-to-dc converter
Operational from single 3.3 V or 5 V supply
460 kbps data rate
2 × Tx and 2 × Rx channels
Meets EIA/TIA-232E specifications
ESD protection to IEC 61000-4-2 on RINx and TOUTx pins
Contact discharge: ±8 kV
Air gap discharge: ±15 kV
0.1 μF charge pump capacitors
High common-mode transient immunity: >25 kV/μs
Safety and regulatory approvals (pending)
UL recognition
2500 V rms for 1 minute per UL 1577
VDE certificate of conformity
IEC 60747-5-2 (VDE 0884, Part 2)
VIORM = 560 V peak
CSA Component Acceptance Notice #5A
Operating temperature range: −40°C to +85°C
44-ball chip scale package ball grid array (CSP_BGA)
OSC
VISO
VOLTAGE
DOUBLER
RECT
ROUT1
DECODE
ENCODE
DECODE
ENCODE
C2+ C2–
C4
0.1µF
16V
V–
VOLTAGE
INVERTER
ENCODE
TIN2
C2
0.1µF
16V
REG
DECODE
ROUT2
0.1µF
ENCODE
TIN1
10µF
DECODE
GND
R
RIN1*
TOUT1
T
R
T
RIN2*
TOUT2
GNDISO
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON THE RS-232 INPUTS.
10515-001
FEATURES
Figure 1.
APPLICATIONS
Isolated RS-232 interface
High noise data communications
Industrial communications
Industrial/telecommunications diagnostic ports
Medical equipment
GENERAL DESCRIPTION
The ADM3252E is a high speed, 2.5 kV, fully isolated, dualchannel RS-232/V.28 transceiver device that is operational 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 isoPower™. There is
no requirement to use a separate isolated dc-to-dc converter. Chip
scale transformer iCoupler® technology from Analog Devices, Inc.,
is used for both the isolation of the logic signals and the integrated
dc-to-dc converter. The result is a total isolation solution.
Rev. A
isoPower technology in the ADM3252E uses high frequency
switching elements to transfer power through its transformer.
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.
The ADM3252E conforms to the EIA/TIA-232E and ITU-T V.28
specifications and operates at data rates of up to 460 kbps. Four
external 0.1 μF charge pump capacitors are used for the voltage
doubler/inverter, permitting operation from a single 3.3 V or 5 V
supply. The ADM3252E is available in a 44-ball, chip scale
package ball grid array (CSP_BGA) and is specified over the
−40°C to +85°C temperature range.
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2012–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
