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PDF LTM2885 Data sheet ( Hoja de datos )
| Número de pieza | LTM2885 | |
| Descripción | RS485/RS422 uModule Transceiver + Power | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM2885 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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FEATURES
nn RS485/RS422 Transceiver: 6500VRMS for 1 Minute
nn Reinforced Insulation
nn Isolated DC Power: 5V at 150mA
nn No External Components Required
nn 20Mbps or Low EMI 250kbps Data Rate
nn High ESD: ±15kV HBM on Transceiver Interface
nn High Common Mode Transient Immunity: 50kV/μs
nn Integrated Selectable 120Ω Termination
nn Extended Creepage and Clearance ~14.6mm
nn 1.62V to 5.5V Logic Supply Pin for Flexible
Digital Interface
nn Maximum Continuous Working Voltage: 690VRMS
nn High Input Impedance Failsafe RS485 Receiver
nn Current Limited Drivers and Thermal Shutdown
nn Compatible with TIA/EIA-485-A and PROFIBUS
nn High Impedance Output During Internal Fault Condition
nn Low Current Shutdown Mode (< 10µA)
nn General Purpose CMOS Isolated Channel
nn 22mm × 9mm × 5.16mm Surface Mount BGA Package
APPLICATIONS
nn Isolated RS485/RS422 Interface
nn Industrial Networks
nn Breaking RS485 Ground Loops
nn Isolated PROFIBUS-DP Networks
LTM2885
6500VRMS Isolated
RS485/RS422 µModule
Transceiver + Power
DESCRIPTION
The LTM®2885 is a complete galvanically isolated
full-duplex RS485/RS422 µModule® (micromodule)
transceiver. No external components are required. A
single supply powers both sides of the interface through
an integrated, isolated, low noise, efficient 5V output
DC/DC converter.
Coupled inductors and an isolation power transformer
provide 6500VRMS of isolation between the line transceiver
and the logic interface. This device is ideal for systems
where the ground loop is broken allowing for large common
mode voltage variation. Uninterrupted communication is
guaranteed for common mode transients up to 50kV/μs.
Maximum data rates are 20Mbps or 250kbps in slew
limited mode. Transmit data, DI, and receive data, RO, are
implemented with event driven low jitter processing. The
receiver has a one-eighth unit load supporting up to 256
nodes per bus. A logic supply pin allows easy interfacing
with different logic levels from 1.62V to 5.5V, independent
of the main supply.
Enhanced ESD protection allows this part to withstand up
to ±15kV (human body model) on the transceiver interface
pins to isolated supplies and ±25kV through the isolation
barrier to logic supplies without latch-up 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 Half-Duplex RS485 μModule Transceiver
5V
LTM2885 Operating Through 100kV/μs CM Transients
VCC
VL
RO
RE
TE
DE
DI
GND
PWR
LTM2885
VCC2
A
B
5V
OUT
GND2
Y
Z
2885 TA01a
TWISTED-PAIR
CABLE
5V/DIV
5V/DIV
DI
MULTIPLE SWEEPS
OF COMMON MODE
TRANSIENTS
300V/DIV
For more information www.linear.com/LTM2885
RO
20ns/DIV
2885 TA01b
2885f
1
1 page  
LTM2885
S WITCHING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature
noted.
range,
otherwise
specifications
are
at
TA
=
25°C.
VCC
=
5.0V,
VL
=
3.3V,
GND
=
GND2
=
0V,
ON
=
VL
unless
otherwise
SYMBOL PARAMETER
Driver SLO = VCC2
fMAX Maximum Data Rate
tPLHD
tPHLD
Driver Input to Output
∆tPD
Driver Input to Output Difference
|tPLHD – tPHLD|
tSKEWD
Driver Output Y to Output Z
ttRFDD Driver Rise or Fall Time
ttZLLZDD
,
,
ttZHHZDD
,
Driver Output Enable or Disable
Time
Driver SLO = GND2
fMAX
tPLHD
tPHLD
∆tPD
tSKEWD
Maximum Data Rate
Driver Input to Output
Driver Input to Output Difference
|tPLHD – tPHLD|
Driver Output Y to Output Z
ttRFDD
ttLZZLDD
,
,
ttZHHZDD
,
Receiver
Driver Rise or Fall Time
Driver Output Enable or Disable
Time
tPLHR
tPHLR
tSKEWR
ttRFRR
ttZLLZRR
,
,
ttZHHZRR
,
tRTEN, tRTZ
Receiver Input to Output
Differential Receiver Skew
|tPLHR – tPHLR|
Receiver Output Rise or Fall Time
Receiver Output Enable Time
Termination Enable or Disable
Time
Generic Logic Input
ttPPLHHLLL11
DIN to DOUT Input to Output
Power Supply Generator
VCC2 – GND2 Supply Start-Up
Time
(0V to 4.5V)
CONDITIONS
(Note 3)
RDIFF = 54Ω, CL = 100pF
(Figure 4)
(RFDigIFuFr=e
54Ω,
4)
CL
=
100pF
(RFDigIFuFr=e
54Ω,
4)
CL
=
100pF
(RFDigIFuFr=e
54Ω,
4)
CL
=
100pF
(RFLig=ur5e005Ω) , CL = 50pF
(Note 3)
RDIFF = 54Ω, CL = 100pF
(Figure 4)
RDIFF = 54Ω, CL = 100pF
(Figure 4)
RDIFF = 54Ω, CL = 100pF
(Figure 4)
(RFDigIFuFr=e
54Ω,
4)
CL
=
100pF
(RFLig=ur5e005Ω) , CL = 50pF
CL = 15pF, VCM = 2.5V, |VAB| = 1.4V,
tR and tF < 4ns, (Figure 6)
C(FLig=u1re5p6F)
C(FLig=u1re5p6F)
(RFLig=u1rkeΩ7,) CL = 15pF
RE = 0V, DE = 0V, VAB = 2V, VB = 0V (Figure 8)
CtRL
= 15pF,
and tF <
4ns
ON VL, No Load
MIN TYP MAX UNITS
20
l
l
l
l
l
Mbps
60 85
ns
1 8 ns
1 ±8 ns
4 12.5 ns
170 ns
250
l
l
kbps
1 1.55 µs
50 500
ns
±200 ±750
ns
0.9 1.5
µs
400 ns
l
100 140
ns
l 1 8 ns
l 3 12.5 ns
l 50 ns
l 100 µs
l
60 100
ns
l
200 500
µs
For more information www.linear.com/LTM2885
2885f
5
5 Page 
TEST CIRCUITS
Y
GND
OR
DI DRIVER
VL
Z
+
V–OD
R
R+
V–OC
2885 F01
Figure 1. Driver DC Characteristics
LTM2885
Y
GND
OR
DI DRIVER
VL
Z
IOSD
+– –7V TO 12V
2885 F02
Figure 2. Driver Output Short-Circuit Current
IIN A OR B
VIN +–
RECEIVER
B OR A
RIN
=
VIN
IIN
2885 F03
Figure 3. Receiver Input Current and Input Resistance
For more information www.linear.com/LTM2885
2885f
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LTM2885.PDF ] | |
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