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Linear Technology DC1794A Demo Manual

Ltm2885 isolated rs485/rs422 module transceiver + power
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Description
Demonstration circuit 1794A is an isolated RS485/RS422
μModule
transceiver + power featuring the LTM
®
demo circuit is a 6500V
RS422 transceiver interface. The demo circuit features
an EMI optimized circuit configuration and printed circuit
board layout. The demo circuit operates from a single
external supply on V
perForMAnce sUMMArY
SYMBOL
PARAMETER
V
Input Supply Range
CC
V
Output Voltage
CC2
f
Maximum Data rate
MAX
V
Maximum Working Insulation Voltage
IORM
Common Mode Transient Immunity
operAting principles
The LTM2885 contains an isolated DC/DC converter, de-
livering power to V
Isolation is maintained by the separation of GND and GND2,
which significant operating voltages and transients can
exist without affecting the operation of the LTM2885. The
logic side ON pin enables or shuts down the LTM2885.
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 jumper
is included on the demo circuit to ease setting the system
configuration. The SLO pin configures the slew rate of the
driver output pins Y and Z.
Arrow.com.
Downloaded from
galvanically isolated RS485/
RMS
. The part generates the output
CC
at 5V from the input supply, V
CC2
DEMO MANUAL DC1794A
µModule Transceiver + Power
voltage V
CC2
2885. The
across the isolation barrier using LTC's isolator µModule
®
technology.
Design files 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.
(T
= 25°C)
A
CONDITIONS
LTM2885
I
= 0mA to 100mA, DE = 0V
LOAD
SLO = V
CC2
GND to GND2
Data is transmitted out the driver pins Y and Z from the
.
input DI with DE set on. Data is received through the dif-
CC
ference in A and B to the output RO with RE set on.
The LTM2885 µModule and demo circuit has been designed
and optimized for low RF emissions. To this end some
features of the LTM2885 are not available for evaluation
on the demo circuit, primarily to minimize the size of the
demo board and to limit the number of I/O connections.
The logic supply voltage, V
circuit. All control signals are selectable by jumper pro-
gramming only, including ON, RE, DE, TE and SLO. The
spare logic channel D
Isolated RS485/RS422
and communicates all necessary signaling
MIN
TYP
4.5
5
4.75
5
20
890
600
50
, is tied to V
L
to D
is not available.
IN
OUT
LTM2885
MAX
UNITS
5.5
V
V
Mbps
V
DC
V
RMS
kV/µs
on the demo
CC
dc1794afa
1

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Summary of Contents for Linear Technology DC1794A

  • Page 1 EMI optimized circuit configuration and printed circuit http://www.linear.com/demo board layout. The demo circuit operates from a single L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of external supply on V . The part generates the output Linear Technology Corporation.

  • Page 2: Operating Principles

    VBW = 300kHz –20 SWEEP TIME = 17s # OF POINTS = 501 –30 0 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) DC1794A F01 Figure 1. DC1794A Radiated Emissions dc1794afa Arrow.com. Arrow.com. Downloaded from Downloaded from...

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC1794A qUick stArt proceDUre Demonstration circuit 1794A is easy to set up and evalu- 2. With power off, connect the input power supply to V ate the performance of the LTM2885. Refer to Figure 2 and GND turrets.

  • Page 4: Pcb Layout

    DEMO MANUAL DC1794A pcB lAYoUt Layer 1. Top Layer Layer 2. Bottom Layer pArts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components I.C., LTM2885IY LINEAR LTM2885IY#PBF Hardware/Components (For Demo Board Only) CAP ., TANT 10μF 16V 10% 3216...

  • 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.
  • Page 6 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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Ltm2885

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