DC241B datasheet, PDF - EEWORLD Datasheet

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DC241B: Descriptionboard demo ltc1535csw; CategoryDevelopment board/suite/development tools; File Size163KB，4 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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DEMO MANUAL DC241B

LTC1535

Full Duplex, Isolated RS485

Transceiver with Slew Limiting

DESCRIPTION

Demonstration circuit 241B showcases the LTC

1535

isolated RS485 transceiver. The LTC1535 features 2,500V

isolation; the “left-half” of the chip contains familiar RS485

logic functions and an isolated switching converter, and

the “right-half” contains the RS485 transceiver. Both sides

include a communications section to send data back and

forth across the internal capacitive isolation barrier.

The LTC1535 allows the user to break ground loops that

cause problems in large systems, and it can also handle

high common mode swings relative to ground without

loss of data.

Isolation Considerations

The board, as constructed, is designed for 500V isolation,

limited by the CTX02-14659 transformer. A full 3750V UL

approvable transformer is also available from Coiltronics

as CTX02-14608. Note that the LTC1535 meets only a

2,500V test.

Logic Interface

The left-half of DC241B contains the logic interface sec-

tions. Large terminals are provided for +5V and logic ground

CC1

and GND1). The input current is approximately

94mA. The smaller terminals connect to RO (receiver

output),

(receiver enable), DE (driver enable), and DI

(driver input). The terminals are arranged to match the

LTC485 industry-standard pinout.

RS485 Interface

The right-hand side contains the isolated RS485 section.

The chip is designed for full duplex operation. So the

receiver input A-B and driver output Y-Z are brought out

to small terminals. The receiver also has a local output

RO2. Larger terminals V

CC2

and GND2 are powered from

the transformer, and require no external power. They

are included for the purpose of monitoring the isolated

converter output.

Other DC241B Features

Both sides have green LEDs (D1, D3) for monitoring the

presence of power. A 3.3k series resistor makes for dim

viewing, but conserves current. For accurate power supply

current measurement disable the LEDs with JP1 and JP3.

120Ω, 1/4W terminations are included. They are selected

with jumpers JP4 (receiver) and JP5 (driver).

Half-duplex operation is simplified by S1, which simply

shorts A to Y and B to Z. Half to the left, full to the right.

The driver slew rate is controlled by JP2; slow left and

fast right.

Terminal block J1 is the fastest way to graft DC241B into a

system. J1 requires a 2mm screw driver (Xcelite

P3321

recommended). Xcelite R181 won’t fit no matter how hard

you push.

Design files for this circuit board are available at

http://www.linear.com/demo

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.

dc241bf

DEMO MANUAL DC241B

DEMONSTRATION BOARD IMPORTANT NOTICE

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. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever.

LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction

is not exclusive.

Please read the DEMO BOARD manual prior to handling the product.

Persons handling this product must have electronics training and

observe good laboratory practice standards.

Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

dc241bf

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900

●

LT 0811 • PRINTED IN USA

FAX: (408) 434-0507

●

www.linear.com

LINEAR TECHNOLOGY CORPORATION 2011

DC241B Related Products

	DC241B	LTC1535CSW#TR	LTC1535ISW#TR	LTC1535ISW#PBF
Description	board demo ltc1535csw	IC transceiver rs485 iso 28soic	IC transceiver rs485 iso 28soic	IC transceiver rs485 iso 28soic
Brand Name	-	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	-	incompatible	incompatible	conform to
Maker	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	-	SOIC	SOIC	SOIC
package instruction	-	SOP, SOP16/28,.4	SOP, SOP16/28,.4	SOP, SOP28,.4
Contacts	-	28	28	28
Manufacturer packaging code	-	SW	SW	SW
Reach Compliance Code	-	_compli	not_compliant	compliant
ECCN code	-	EAR99	EAR99	EAR99
Differential output	-	YES	YES	YES
Number of drives	-	1	1	1
Input properties	-	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER	DIFFERENTIAL SCHMITT TRIGGER
Interface integrated circuit type	-	LINE TRANSCEIVER	LINE TRANSCEIVER	LINE TRANSCEIVER
Interface standards	-	EIA-422; EIA-485	EIA-422; EIA-485	EIA-422; EIA-485
JESD-30 code	-	R-PDSO-G16	R-PDSO-G16	R-PDSO-G16
JESD-609 code	-	e0	e0	e3
length	-	17.9 mm	17.9 mm	17.9 mm
Humidity sensitivity level	-	1	1	1
Number of functions	-	1	1	1
Number of terminals	-	16	16	16
Maximum operating temperature	-	70 °C	85 °C	85 °C
Minimum output swing	-	1.5 V	1.5 V	1.5 V
Maximum output low current	-	0.004 A	0.004 A	0.004 A
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	SOP	SOP	SOP
Encapsulate equivalent code	-	SOP16/28,.4	SOP16/28,.4	SOP28,.4
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	-	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	-	255	255	260
power supply	-	5 V	5 V	5 V
Certification status	-	Not Qualified	Not Qualified	Not Qualified
Maximum receive delay	-	855 ns	855 ns	855 ns
Number of receiver bits	-	1	1	1
Maximum seat height	-	2.65 mm	2.65 mm	2.65 mm
Maximum slew rate	-	73 mA	73 mA	73 mA
Maximum supply voltage	-	5.5 V	5.5 V	5.5 V
Minimum supply voltage	-	4.5 V	4.5 V	4.5 V
Nominal supply voltage	-	5 V	5 V	5 V
Supply voltage 1-max	-	7.5 V	7.5 V	7.5 V
Mains voltage 1-minute	-	4.5 V	4.5 V	4.5 V
Supply voltage1-Nom	-	5 V	5 V	5 V
surface mount	-	YES	YES	YES
technology	-	CMOS	CMOS	CMOS
Temperature level	-	COMMERCIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Matte Tin (Sn)
Terminal form	-	GULL WING	GULL WING	GULL WING
Terminal pitch	-	1.27 mm	1.27 mm	1.27 mm
Terminal location	-	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	-	40	40	30
maximum transmission delay	-	1560 ns	1560 ns	1560 ns
width	-	7.5 mm	7.5 mm	7.5 mm

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Shortcut: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DZ

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