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PDF LTM2882 Data sheet ( Hoja de datos )
| Número de pieza | LTM2882 | |
| Descripción | uModule Transceiver Power | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM2882 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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LTM2882
Dual Isolated RS232
µModule Transceiver + Power
Features
Description
n RS232 Transceiver: 2500VRMS for 1 Minute
n UL-CSA Recognized
File #E151738
n CSA Component Acceptance Notice 5A
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
Interfacing
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 HBM ESD on
Isolated RS232 Interface or Across Isolation Barrier
n High Common Mode Transient Immunity: 30kV/μs
n Maximum Continuous Working Voltage: 560VPEAK
n True RS232 Compliant Output Levels
n 15mm × 11.25mm BGA and LGA Packages
Applications
The LTM®2882 is a complete galvanically isolated dual
RS232 µModule® (micromodule) 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 2500VRMS 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.
n Isolated RS232 Interface
n Industrial Communication
n Test and Measurement Equipment
n Breaking RS232 Ground Loops
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
1Mbps Operation
3.3V (LTM2882-3)
5V (LTM2882-5)
OFF ON
VL VCC
ON
DIN
T1IN
R1OUT
LTM2882
VCC2
DE
DOUT
T1OUT
R1IN
5V
AVAILABLE CURRENT:
150mA (LTM2882-5)
100mA (LTM2882-3)
5V/DIV
10V/DIV
5V/DIV
TIN
T1OUT/R1IN
T2OUT/R2IN
R1OUT
R2OUT
T2IN
R2OUT
GND
GND2
T2OUT
R2IN
2882 TA01a
400ns/DIV
2882 TA01b
DRIVER OUTPUTS TIED TO RECEIVER INPUTS
TOUT LOAD = 250pF + RIN
ROUT LOAD = 150pF
For more information www.linear.com/LTM2882
2882fg
1
1 page  
LTM2882
s witching Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications
GND2 = 0V, ON = VL unless otherwise noted.
are
at
TA
=
25°C.
LTM2882-3
VCC
=
3.3V,
LTM2882-5
VCC
=
5.0V,
VL
=
VCC,
and
GND
=
SYMBOL
PARAMETER
Receiver
tPHLR, tPLHR
Receiver Propagation Delay
tSKEWR
Receiver Skew |tPHLR – tPLHR|
tRR, tFR
Receiver Rise or Fall Time
Auxiliary Channel
tPHLL, tPLHL
tRL, tFL
Power Supply
Propagation Delay
Rise or Fall Time
Power-Up Time
CONDITIONS
CL = 150pF (Figure 3)
CL = 150pF (Figure 3)
CL = 150pF (Figure 3)
CL = 15pF, tR and tF < 4ns (Figure 4)
CL = 150pF (Figure 4)
ON = ↑ to VCC2(MIN)
MIN TYP MAX UNITS
l
0.2 0.4
µs
40 ns
l
60 200
ns
l
60 100
ns
l
60 200
ns
l
0.2 2
ms
I solation Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. LTM2882-3 VCC = 3.3V, LTM2882-5 VCC = 5.0V, VL = VCC, and GND =
GND2 = 0V, ON = VL unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VISO
Rated Dielectric Insulation Voltage
1 Minute, Derived from 1 Second Test
1 Second (Notes 5, 6)
2500
±4400
VRMS
V
VIORM
CTI
DTI
Common Mode Transient Immunity
Maximum Working Insulation Voltage
VL = ON = 3.3V, VCM = 1kV, ∆t = 33ns (Note 2)
(Notes 2, 5)
Partial Discharge
Comparative Tracking Index
Depth of Erosion
Distance Through Insulation
Input to Output Resistance
VPR = 1050 VPEAK (Notes 2, 5)
IEC 60112 (Note 2)
IEC 60112 (Note 2)
(Note 2)
(Notes 2, 5)
30
560
400
600
0.017
0.06
109
5
kV/µs
VPEAK
VRMS
pC
VRMS
mm
mm
Ω
Input to Output Capacitance
(Notes 2, 5)
6 pF
Creepage Distance
(Notes 2, 5)
9.48 mm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Guaranteed by design and not subject to production test.
Note 3: Maximum Data Rate is guaranteed by other measured parameters
and is not tested directly.
Note 4: This device includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 105°C when overtemperature protection is active.
Continuous operation above specified maximum operating junction
temperature may result in device degradation or failure.
Note 5: Tests performed from GND to GND2, all pins shorted each side of
isolation barrier.
Note 6: The rated dielectric insulation voltage should not be interpreted as
a continuous voltage rating.
For more information www.linear.com/LTM2882
2882fg
5
5 Page 
Block Diagram
LTM2882
VCC
VL
GND
ON
DIN
T1IN
R1OUT
T2IN
R2OUT
2.2µF
2.2µF
DC/DC
CONVERTER
5V
REG
2.2µF
VDD
VEE
VCC2
GND2
DE
DOUT
ISOLATED
COMMUNI-
CATIONS
INTERFACE
ISOLATED
COMMUNI-
CATIONS
INTERFACE
VDD
VEE
5k
VDD
VEE
5k
T1OUT
R1IN
T2OUT
R2IN
2882 BD
For more information www.linear.com/LTM2882
2882fg
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LTM2882.PDF ] | |
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