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dc1851af

DEMO MANUAL DC1851A

DESCRIPTION

LTC2872

Dual Multiprotocol Transceiver

with Integrated Termination

Demonstration circuit 1851A showcases the LTC®2872

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

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.

PERFORMANCE SUMMARY

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply

VCC Operating

VL Operating

3.0

1.7

5.5

VCC

V

V

Maximum Data Rate

RS232

RS485

500

20

kbps

Mbps

Specifications are at TA = 25°C