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DC1554A-B

Description
evaluation kit trxr ltm2882-5
CategoryDevelopment board/suite/development tools   
File Size311KB,6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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evaluation kit trxr ltm2882-5

DEMO MANUAL DC1747A
LTM2882:
Dual Isolated RS232
µModule Transceiver + Power
DESCRIPTION
Demonstration circuit 1747A is a dual isolated RS232
μModule
®
transceiver with integrated power featuring
the LTM
®
2882. The demo circuit provides a 2-chan-
nel, 2500V
RMS
, galvanically isolated RS232 transceiver
interface. The demo circuit features an EMI optimized
circuit configuration and printed circuit board layout. All
components are integrated into the μModule transceiver.
The demo circuit operates from a single external supply
on V
CC
. The part generates the output voltage V
CC2
and
communicates all necessary signaling across the isola-
tion barrier using Linear Technology’s isolator μModule
technology.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
PERFORMANCE SUMMARY
SYMBOL
V
CC
V
CC2
f
MAX
PARAMETER
Input Supply Range
Output Voltage
Maximum Data Rate
(T
A
= 25°C)
CONDITIONS
LTM2882−5
LTM2882−3
LTM2882-5 I
LOAD
= 150mA
LTM2882-3 I
LOAD
= 100mA
R
L
= 3k, C
L
= 2.5nF
R
L
= 3k, C
L
= 1nF
R
L
= 3k, C
L
= 250pF
GND to GND2
MIN
4.5
3.0
4.7
4.7
100
250
1000
560
400
30
TYP
5
3
5
5
MAX
5.5
3.6
UNITS
V
V
V
V
kbps
kbps
kbps
V
DC
V
RMS
kV/μs
V
IORM
Maximum Working Insulation Voltage
Common Mode Transient Immunity
OPERATING PRINCIPLES
The LTM2882 contains an isolated DC/DC converter de-
livering power to V
CC2
at 5V from the input supply V
CC
.
Isolation is maintained by the separation of GND and GND2
where significant operating voltages and transients can
exist without affecting the operation of the LTM2882. The
logic side ON pin enables or shuts down the LTM2882.
RS232 signaling is controlled by the logic inputs T1IN,
T2IN and DE. Connection to the transceiver pins, R1IN-
T1OUT or R2IN-T2OUT, permits RS232 communication on
the isolated side of the demo circuit. The circuit features
two channels, supporting multiple RS232 channels or
the addition of flow control on a single RS232 interface.
The spare logic channel, DIN to DOUT, is configured to
control the state of the driver outputs, T1OUT and T2OUT,
by connecting DOUT to DE.
Data is transmitted out the driver pins T1OUT and T2OUT
from the inputs T1IN and T2IN with the input DE set to
ON. Data is received through the receiver pins R1IN and
R2IN to the outputs R1OUT and R2OUT; receivers are
always active.
The demo circuit has been designed and optimized for low
RF emissions. To this end, some features of the LTM2882
are not available for evaluation on the demo circuit.
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