Linear LTC2803 Manual de usuario

LTC4260CGN

DESCRIPTION

Demonstration circuit827 is a 1.8V to 5.5V RS-232

DualTransceiverfeaturing theLTC2803 and LTC2804.

VERSION P/N

DC827A-A LTC2803CDHC

DC827A-B LTC2804CDHC

Design files for this circuit board are available. Call

the LTC factory.

, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT and

PowerPath are trademarks of Linear Technology Corporation.

PERFORMANCE SUMMARY

SYMBOL

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Supply Voltage

1.8 5.5 V

Logic Supply Voltage 1.8 5.5 V

SR(D)

Driver Slew Rate R

=3kΩ, 50pF<C

<2.5nF

LTC2803:

LTC2804:

150

V/µs

Maximum Data Rate R

= 3kΩ, C

= 2.5nF

= 3kΩ, C

= 1.0nF

= 3kΩ, C

= 250pF (LTC2804)

100

250

1000

kbps

JUMPERS

SCH NAME PURPOSE

JP1,

JP2

MODE,

Mode control, as follows:

PS MODE MODE NAME

OFF L Shutdown

OFF H Receivers Active

ON L Drivers Disabled

ON H Normal

JP3

LOGIC

SUPPLY

Selects supply for VL pin. Use setting “VL” for a

separate logic supply, or “VCC” to share a single

supply.

JP4,

JP5

TD/RD,

RTS/CTS

Selects Receiver loopback mode, for use with the

DB9 connector. In this configuration, R1OUT is con-

nected to T1IN and R2OUT is connected to T2IN.

SCH NAME PURPOSE

For the UART connected to the DB9, this wraps TD

back to RD and RTS back to CTS.

DEMO CIRCUIT

827

QUICK START GUIDE

LTC2803 and LTC2804

1.8V to 5.5V RS-232 Dual Transceiver

Downloaded from Arrow.com.

QUICK START PROCEDURE

Demonstrationcircuit827iseasytosetupforevaluat-

ing the LTC2803 and LTC2804. Referto Figure 1 or

Figure 2forpropersetup andfollowthe procedurebe-

low:

Placejumpersinthefollowing positions:

MODE H

PS ON

With power off,connect the primary power supply

to VCC and GND.

Set JP3 “Logic Supply”tothe correctposition.Ifa

separatelogic supplyisn’t needed, use the “VCC”

setting.IfaseparateLogic Supply willbe used,use

the“VL”settingand, withthepoweroff,connectthe

supplyto VL and GND.

Fortransmitterloopback mode (Figure 1),connect

each driveroutputtoareceiverinput.Connectinput

sourcestothe driverinputs.(Make surethatinput

voltages don’texceed 7V.) Omit Loopbackjumpers

JP4 and JP5 forthis mode.

Alternatively,tooperatethepartinreceiverloopback

mode(Figure2),connecta9-wire RS-232 cablebe-

tween DB9 connector J1 and the serial port of a

computer.Placejumpersinthetwo LOOPBACK po-

sitions:

TD/RD

CTS/RTS

Data may be transmitted and monitored using a

terminal emulation program such as Terminal,

HyperTerminal,TeraTerm Pro,or RealTerm.

Turn on the input supply/supplies in any order.

(Note: Make sure that the voltage doesn’t exceed

7V.)

Check for the proper generated supply voltages:

VDD = 6.5Vto 7.5V,and VEE =-6.8Vto-5.8V.

Send data!

Notes:

Inputs PS and MODE may be driven by signalsin-

stead of set withjumpers.If done, ensurethatthe

voltage of PS doesn’texceed VL.

Theterminalemulation program RealTerm canlock

up when RTS/CTS flow controlis used in receiver

loopback mode.

JP1

JP2

JP4

JP5

Downloaded from Arrow.com.Downloaded from Arrow.com.

LTC2803 AND LTC2804

Figure 1. Setup for Transmitter Loopback Mode

Figure 2. Setup for Receiver Loopback Mode

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

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