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DESCRIPTION
Demonstration circuit 1851A showcases the LTC
RS232/RS485 dual multiprotocol transceiver with inte-
grated termination. Separate supply inputs power the
interface and logic sections, permitting operation of the
logic control and I/O down to 1.7V. LEDs indicate when
supplies are present. Control pins are accessible via tur-
rets for external connections, or they may be set high or
low by means of a jumper. All logic I/O and interface I/O
is routed to turrets. The RS485 interface lines are also
PERFORMANCE SUMMARY
PARAMETER
Input Supply
Maximum Data Rate
®
2872
Specifications are at T
CONDITIONS
V
Operating
CC
V
Operating
L
RS232
RS485
DEMO MANUAL DC1851A
Dual Multiprotocol Transceiver
with Integrated Termination
available at a terminal block for convenient connection of
a transmission line. Because the LTC2872 contains half-/
full-duplex switching, it is unnecessary to jumper A and
B to Y and Z for half-duplex operation.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
= 25°C
A
LTC2872
MIN
TYP
MAX
UNITS
3.0
5.5
1.7
V
CC
500
20
dc1851af
V
V
kbps
Mbps
1
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Related Manuals for Linear Technology DC1851A
Summary of Contents for Linear Technology DC1851A
- Page 1 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear low by means of a jumper. All logic I/O and interface I/O Technology Corporation. All other trademarks are the property of their respective owners.
- Page 2 DEMO MANUAL DC1851A QUICK START PROCEDURE Overview In summary, DC1851A features a turret for each and every LTC2872 logic, interface and supply pin. In addition the The LTC2872 dual multiprotocol transceiver contains two supply pins have banana jacks, and the control pins are identical channels, each comprising two RS232 drivers, connected to jumper blocks to establish their states.
- Page 3 RS232 mode, TE485 is overridden and the RS485 As shipped, jumpers on DC1851A are set to select termination for that channel is automatically disabled. full-duplex RS485 mode with terminations enabled for Default JP9 position low.
- Page 4 DEMO MANUAL DC1851A QUICK START PROCEDURE The LTC2872 may be made to self-oscillate as a ring duplex mode (connect Y to B and Z to A). The connection oscillator by connecting the drivers and receivers in one arrangement shown in Figure 2 forms a ring oscillator all-encompassing loop, and adding one inversion.
- Page 5 DEMO MANUAL DC1851A QUICK START PROCEDURE 3.3V SUPPLY ≈60mA – dc1851 F02 Figure 2. Ring Oscillator Connection Permits Examination of All Waveforms Without the Need for a Signal Generator. Oscillation Frequency ≈260kHz dc1851af...
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Page 6: Parts List
DEMO MANUAL DC1851A PARTS LIST REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP, 0805, 470nF, 10%, 25V, X5R AVX 08053D474KAT2A C2, C3, C4 CAP, 0805, 2.2μF, 10%, 25V, X7R AVX 08053C225KAT2A CAP, 0805 100nF, 10%, 25V, X7R AVX 08053C104KAT2A D1, D2 LED, GREEN PANASONIC LN1351C-(TR) IND, 2016, 22μF, 200mA... -
Page 7: 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 8 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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