LTM2882 Datasheet, PDF (1/16 Pages) Linear Technology – Dual Isolated RS232 μModule Transceiver + Power

Electrical Specifications Subject to Change
LTM2882
Dual Isolated RS232
µModule Transceiver + Power
FEATURES
n _{Isolator μModule Technology}
n _{Isolated Dual RS232 Transceiver: 2500VRMS}
n _{Integrated Isolated DC/DC Converter:}
1W, 65% Efficiency
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
100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load
n _{3.3V (LTM2882-3) or 5V (LTM2882-5) Operation}
n _{No Damage or Latchup to ±10kV ESD HBM on}
Isolated RS232 Interface or Across Isolation Barrier
n _{High Common Mode Transient Immunity: 30kV/μs}
n _{Common Mode Working Voltage: 560VPEAK}
n _{True RS232 Compliant Output Levels}
n _{Small Low Profile (15mm × 11.25mm × 2.8mm)}
Surface Mount LGA Package
APPLICATIONS
n _{Isolated RS232 Interface}
n _{Industrial Communication}
n _{Test and Measurement Equipment}
n _{Breaking RS232 Ground Loops}
DESCRIPTION
The LTM^®2882 is a complete galvanically isolated dual
RS232 μModule^® transceiver. No external components are
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.
Coupled inductors and an isolation power transformer
provide 2500V_RMS of isolation between the line transceiver
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/μs.
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.
Enhanced ESD protection allows this part to withstand up
to ±10kV (human body model) on the transceiver interface
pins to isolated supplies and across the isolation barrier
to logic supplies without latchup or damage.
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
3.3V (LTM2882-3)
5V (LTM2882-5)
OFF ON
V_L V_CC
ON
DIN
LTM2882
V_CC2
DE
DOUT
5V
AVAILABLE CURRENT:
150mA (LTM2882-5)
100mA (LTM2882-3)
T1IN
T1OUT
R1OUT
R1IN
T2IN
T2OUT
R2OUT
R2IN
GND
GND2
2882 TA01a
5V/DIV
1Mbps Operation
TIN
10V/DIV
5V/DIV
T1OUT/R1IN
T2OUT/R2IN
R1OUT
R2OUT
400ns/DIV
2882 TA01b
DRIVER OUTPUTS TIED TO RECEIVER INPUTS
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
2882p
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