DC1746A-A Linear Technology, DC1746A-A Datasheet

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DC1746A-A

Manufacturer Part Number
DC1746A-A
Description
EVALUATION KIT LOW EMI LTM2881-3
Manufacturer
Linear Technology
Series
µModuler
Datasheets

Specifications of DC1746A-A

Main Purpose
Interface, Transceiver RS-422/RS-485
Embedded
No
Utilized Ic / Part
LTM2881
Primary Attributes
3V Supply, Isolated, Transceiver + Power
Kit Contents
Board, Datasheet
Tool / Board Applications
Interface-Backplane, PCI, PCI Express, RS-XXX, Digital & Opto Isolator
Mcu Supported Families
LTM2881
Development Tool Type
Hardware - Eval/Demo Board
Lead Free Status / RoHS Status
Not applicable / Not applicable
Secondary Attributes
-
DESCRIPTION
Demonstration circuit 1746A is an isolated RS485/RS422
μModule
The demo circuit is a 2500V
RS485/RS422 transceiver interface. The demo circuit
features an EMI optimized circuit confi guration and printed
circuit board layout. All components are integrated into
the μModule transceiver. The demo circuit operates from
a single external supply on V
PERFORMANCE SUMMARY
SYMBOL
V
V
f
V
OPERATING PRINCIPLES
The LTM2881 contains an isolated DC/DC converter, de-
livering power to V
Isolation is maintained by the separation of GND and GND2
where signifi cant operating voltages and transients can
exist without affecting the operation of the LTM2881. The
logic side ON pin enables or shuts down the LTM2881.
RS485/RS422 signaling is controlled by the logic inputs
DE, DI, TE and RE. Connection to the transceiver pins (A,
B, Y and Z) allows full- or half-duplex operation on the
isolated side of the demo circuit. A full-/half-duplex switch
is included on the demo circuit to ease setting the system
confi guration. The SLO pin confi gures the slew rate of the
driver output pins Y and Z.
MAX
CC
CC2
IORM
®
PARAMETER
Input Supply Range
Output Voltage
Maximum Data rate
Maximum Working Insulation Voltage
Common Mode Transient Immunity
transceiver + power featuring the LTM
CC2
at 5V from the input supply, V
CC
RMS
. The part generates the
galvanically isolated
(T
CONDITIONS
LTM2881-5
LTM2881-3
I
SLO = V
GND to GND2
A
LOAD
®
= 25°C)
2881.
= 0mA to 100mA, DE = 0V
CC
µModule Transceiver + Power
CC2
.
output voltage V
signaling across the isolation barrier using LTC’s isolator
μModule technology.
Design fi les for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Data is transmitted out the driver pins Y and Z from the
input DI with DE set on. Data is received through the dif-
ference in A and B to the output RO with RE set on.
The demo circuit has been designed and optimized for low
RF emissions. To this end some features of the LTM2881
are not available for evaluation on the demo circuit. The
logic supply voltage, V
All control signals are selectable by jumper programming
only, including ON, RE, DE, TE and SLO. The spare logic
channel D
DEMO MANUAL DC1746A
IN
Isolated RS485/RS422
to D
OUT
CC2
is not available.
and communicates all necessary
L
, is tied to V
MIN
560
400
4.5
3.0
4.7
20
30
CC
TYP
5
3
5
on the demo circuit.
LTM2881:
MAX
5.5
3.6
dc1746af
UNITS
Mbps
kV/μs
V
1
RMS
V
DC
V
V
V

Related parts for DC1746A-A

DC1746A-A Summary of contents

Page 1

... A full-/half-duplex switch is included on the demo circuit to ease setting the system confi guration. The SLO pin confi gures the slew rate of the driver output pins Y and Z. DEMO MANUAL DC1746A µModule Transceiver + Power output voltage V ® ...

Page 2

... Transverse Electromagnetic Waveguides” CISPR 22 CLASS B LIMIT 40 30 DC1746A DETECTOR = QuasiPeak RBW = 120kHz –10 VBW = 300kHz SWEEP TIME = 17s – POINTS = 501 –30 0 100 200 300 400 500 1000 600 700 800 900 FREQUENCY (MHz) DC1746A F01 Figure 1. DC1746A Radiated Emissions dc1746af ...

Page 3

... JP2 ON JP3 ON JP4 ON JP5 OFF SW1 HALF DUPLEX DEMO MANUAL DC1746A 2. With power off, connect the input power supply to V and GND on pin header J1. 3. Turn on the power at the input. NOTE: Make sure that the input voltage does not exceed 6V. ...

Page 4

... DEMO MANUAL DC1746A PCB LAYOUT Layer 1. Top Layer Layer 3. Signal Layer PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION Required Circuit Components I.C., LTM2881CY-3 I.C., LTM2881CY-5 Hardware/Components (For Demo Board Only C1, C5 CAP ., TANT 10μF 10V 20% TAJA CAP ., CER 1μF 10V 20% 0508 ...

Page 5

... SCHEMATIC DIAGRAM Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. DEMO MANUAL DC1746A dc1746af 5 ...

Page 6

... DEMO MANUAL DC1746A Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods ...

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