LTM2882
Dual Isolated RS232
µModule Transceiver + Power
FEATURES
DESCRIPTION
The LTM®2882 is a complete galvanically isolated dual
RS232μModule®transceiver. Noexternalcomponentsare
required. A single 3.3V or 5V supply powers both sides
of the interface through an integrated, isolated DC/DC
converter. A logic supply pin allows easy interfacing with
different logic levels from 1.62V to 5.5V, independent of
the main supply.
n
Isolated Dual RS232 Transceiver: 2500V
RMS
n
Isolated DC Power: 5V at Up to 200mA
n
No External Components Required
n
1.62V to 5.5V Logic Supply for Flexible Digital
Interface
n
High Speed Operation
1Mbps for 250pF/3kΩ Load
250kbps for 1nF/3kΩ Load
Coupled inductors and an isolation power transformer
100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load
3.3V ꢁLTM2882-3ꢂ or 5V ꢁLTM2882-5ꢂ Operation
No Damage or Latchup to 10kV ESD ꢃHM on
Isolated RS232 Interface or Across Isolation Harrier
ꢃigh Common Mode Transient Immunity: 30kV/ꢀs
Common Mode Working Voltage: 560V
True RS232 Compliant Output Levels
provide2500V
ofisolationbetweenthelinetransceiver
RMS
n
n
and the logic interface. This device is ideal for systems
with different grounds, allowing for large common mode
voltages. Uninterrupted communication is guaranteed for
common mode transients greater than 30kV/ꢀs.
n
n
n
n
PEAK
This part is compatible with the TIA/EIA-232-F standard.
Driver outputs are protected from overload and can be
shorted to ground or up to 15V without damage. An
auxiliary isolated digital channel is available. This channel
allows configuration for half-duplex operation by control-
ling the DE pin.
Small Low Profile ꢁ15mm × 11.25mm × 2.8mmꢂ
Surface Mount HGA and LGA Packages
APPLICATIONS
n
Isolated RS232 Interface
n
Industrial Communication
Enhanced ESD protection allows this part to withstand up
to 10kVꢁhumanbodymodelꢂonthetransceiverinterface
pins to isolated supplies and across the isolation barrier
to logic supplies without latchup or damage.
n
Test and Measurement Equipment
Hreaking RS232 Ground Loops
n
L, LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Isolated Dual RS232 μModule Transceiver
1Mbps Operation
3.3V ꢁLTM2882-3ꢂ
5V ꢁLTM2882-5ꢂ
TIN
5V/DIV
V
V
CC
LTM2882
L
V
5V
CC2
DE
AVAILAHLE CURRENT:
150mA ꢁLTM2882-5ꢂ
100mA ꢁLTM2882-3ꢂ
OFF ON
ON
T1OUT/R1IN
10V/DIV
DIN
DOUT
T1OUT
R1IN
T2OUT/R2IN
T1IN
R1OUT
5V/DIV
R2OUT
R1OUT
T2IN
T2OUT
R2IN
2882 TA01b
400ns/DIV
R2OUT
DRIVER OUTPUTS TIED TO RECEIVER INPUTS
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
GND
GND2
2882 TA01a
2882fa
1