Analog Devices EVAL-ADM2482EEB3Z Manual de usuario

Evaluation Board User Guide

UG-210

One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: 781.329.4700 •Fax: 781.461.3113 •www.analog.com

Evaluation Boards for the ADM2482E and ADM2487E Isolated RS-485 Transceivers

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 12

FEATURES

Easy evaluation of the ADM2482E/ADM2487E

Isolated ground plane layout

Configurable as full duplex or half duplex

Evaluation of the ADM2482E at 16 Mbps

Evaluation of the ADM2487E at 500 kbps

ADM2482E/ADM2487E APPLICATIONS

Isolated RS-485/RS-422 interfaces

Process field bus (PROFIBUS) networks

Industrial field networks

Multipoint data transmission systems

EVALUATION KIT CONTENTS

EVAL-ADM2482EEB3Z, EVAL-ADM2487EEB3Z,

EVAL-ADM2482EEB5Z, or EVAL-ADM2487EEB5Z

GENERAL DESCRIPTION

The ADM2482E/ADM2487E evaluation boards allow the

ADM2482E/ADM2487E isolated RS-485 transceivers to be

quickly and easily evaluated. The evaluation board allows all of

the input and output functions to be exercised without the need

for external components.

The ADM2482E/ADM2487E feature an integrated transformer

driver that outputs a pair of square waves to an external trans-

former to provide isolated power. When the ADM2482E/

ADM2487E are powered by 3.3 V on the logic side (VDD1), a trans-

former, U3, is required with a turns ratio of 1:1.5 (DA2303-AL).

This ensures that there is enough headroom for the ADP3330

LDO to output a regulated 3.3 V output (EVAL-ADM2482EEB3Z

and EVAL-ADM2487EEB3Z).

When the ADM2482E/ADM2487E are powered by 5 V on the

logic side, a transformer, U3, is required with a turns ratio of 1:1

(GA3157-AL) to give a 5 V input for the ADP3330, which regu-

lates an output of 3.3 V output (EVAL-ADM2482EEB5Z and

EVAL-ADM2487EEB5Z).

FUNCTIONAL BLOCK DIAGRAM

09479-001

DD1

IN OUT

GND

SD ADP3330

D1 D2

ADM2482E/ADM2487E

OSC

+3.3V ISO

LDO

RECTIFIER

POWER

CONNECTOR

CENTER TAPPED

TRANSFORMER

LOGIC

CONNECTO

TxD

RxD

DD1

GND

DD2

BUS

CONNECTO

GALVANIC ISOLATION

Figure 1.

UG-210 Evaluation Board User Guide

Rev. A | Page 2 of 12

TABLE OF CONTENTS

Features .............................................................................................. 1

ADM2482E/ADM2487E Applications .......................................... 1

Evaluation Kit Contents................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Evaluation Board Configurations................................................... 3

3.3 V Evaluation Board................................................................ 3

5 V Evaluation Board................................................................... 3

Full Duplex, Bus Biasing And Termination Resistors on

Receiver Input................................................................................3

Full Duplex, Bus Biasing And Termination Resistors on

Receiver and Transmitter .............................................................3

Half Duplex with Bus Biasing and Termination .......................3

Powering Up the Bus Side............................................................3

Evaluation Board Schematic and Artwork.....................................5

Ordering Information.......................................................................9

Bill of Materials..............................................................................9

Related Links......................................................................................9

REVISION HISTORY

8/11—Rev. 0 to Rev. A

Changed EVAL2482EEB5Z to EVAL-ADM2482EEB5Z,

EVAL2487EEB5Z to EVAL-ADM2487EEB5Z, and ADP1710 to

ADP3330 Throughout ..................................................................... 1

Change to Figure 1 ........................................................................... 1

Changes to Evaluation Board Configurations Section................ 3

Changes to Table 1............................................................................ 4

Change to Figure 2 ........................................................................... 5

Changes to Figure 3.......................................................................... 6

Changes to Figure 4.......................................................................... 7

Changes to Figure 5.......................................................................... 8

Changes to Table 2 and Related Links Section ............................. 9

11/10—Revision 0: Initial Version

Evaluation Board User Guide UG-210

Rev. A | Page 3 of 12

EVALUATION BOARD CONFIGURATIONS

3.3 V EVALUATION BOARD

The EVAL-ADM2482EEB3Z and EVAL-ADM2487EEB3Z are

shipped in a 3.3 V full-duplex configuration without any bus

biasing resistors inserted by default. The jumper settings are

shown in Table 1. The transformer fitted as U3 for the 3.3 V

version of the evaluation board is the DA2303-AL with a turns

ratio of 1:1.5. The DA2303-AL allows enough headroom for the

ADP3330 LDO to output a regulated 3.3 V output.

5 V EVALUATION BOARD

The EVAL-ADM2482EEB5Z and EVAL-ADM2487EEB5Z are

shipped in a 5 V full-duplex configuration without any bus

biasing resistors inserted by default. The jumper settings are

shown in Table 1. The transformer fitted as U3 for the 5 V

version of the evaluation board is the GA3157-AL with a turns

ratio of 1:1. The GA3157-AL is required to give a 5 V input to

the ADP3330 LDO, which regulates an output of 3.3 V.

FULL DUPLEX, BUS BIASING AND TERMINATION

RESISTORS ON RECEIVER INPUT

Bus biasing resistors can be fitted on the receiver input by

inserting resistors R3 and R4. Jumpers LK11 and LK13 must be

inserted for the bus biasing resistors to be active. All jumper

combinations are shown in Table 1.

A termination resistor can be fitted on the receiver input by

inserting RT. The value of the termination resistor should be

equal to the characteristic impedance of the cable used. To

activate the termination resistor, Jumper LK12 must be inserted.

FULL DUPLEX, BUS BIASING AND TERMINATION

RESISTORS ON RECEIVER AND TRANSMITTER

Bus biasing resistors can be fitted on the transmitter output as

well as on the receiver input. Resistors R3, R4, R2, and R11 and

Jumpers LK11, LK13, LK7, and LK9 must be inserted for this

configuration.

A termination resistor can also be fitted on the transmitter

output by inserting RT1. The value of the termination resistor

should be equal to the characteristic impedance of the cable

used. To activate the termination resistor, Jumper LK10 must be

inserted.

HALF DUPLEX WITH BUS BIASING AND

TERMINATION

To configure the evaluation board as half duplex, Receiver Input

Pin A must be connected to Transmitter Output Pin Y and

Receiver Input Pin B must be connected to Transmitter Output

Pin Z. This is accomplished by inserting Jumper LK15 and

Jumper LK16.

In this configuration if biasing resistors are inserted, only the

resistors on the receiver input, or on the transmitter output

should be selected. This is achieved by either inserting resistors

R3 and R4 and jumpers LK11 and LK13 (leaving LK7 and LK9

open), or by inserting resistors R2 and R11 and jumpers LK7

and LK9 (leaving LK11 and LK13 open).

Similarly only the termination resistor on the receiver input or

on the transmitter output should be selected (e.g. LK12

inserted, LK10 open).

POWERING UP THE BUS SIDE

The bus side can be powered using either the regulator built

into the board or by using an external power source. Jumper

LK1 allows the user to select between these two methods. By

inserting Jumper LK1 into Position A, the board can be pow-

ered using an external power source. Inserting Jumper LK1 into

Position B selects the built-in regulator to supply the bus side.

UG-210 Evaluation Board User Guide

Rev. A | Page 4 of 12

Table 1. Board Configurations and Jumper Settings

Configuration Jumpers Fitted Jumpers Open

Full Duplex Configuration LK 15, LK16

Half-Duplex Configuration (A Connected to Y, B Connected to Z) LK15, LK16

No Biasing Resistors LK7, LK9, LK11, LK13

Bus Biasing Resistors on A/B only LK11, LK13 LK7, LK9

Bus Biasing Resistors on Y/Z only LK7, LK9 LK11, LK13

Bus Biasing Resistors on A/B and Y/Z (Full Duplex) LK7, LK9, LK11, LK13 LK 15, LK16

No Termination Resistors LK10, LK12

Termination Resistor on A/B only LK12 LK10

Termination Resistor on Y/Z only LK10 LK12

Termination Resistors on A/B and Y/Z (Full Duplex) LK10, LK12 LK 15, LK16

Powering the Bus Side Using the Regulator on the Board LK1 (Position B) LK1 (Position A)

Powering the Bus Side Using an External Power Supply LK1 (Position A) LK1 (Position B)

Using the Transformer on the Board LK2 (Position A) LK2 (Position C)

LK3 (Position A) LK3 (Position C)

Using the SMA Connector for RxD LK8 (Position A) LK8 (Position B)

Using the Screw Terminal for RxD LK8 (Position B) LK8 (Position A)

Using the SMA Connector for TxD LK5 (Position B) LK5 (Position A)

Using the Screw Terminal for TxD LK5 (Position A) LK5 (Position B)

RE High LK4 (Position A)

RE Low LK4 (Position B)

Using the Screw Terminal for RE LK4 (Position C)

DE High LK6 (Position A)

DE Low LK6 (Position B)

Using the Screw Terminal for DE LK6 (Position C)

Tie RE and DE Together (Note Only One Jumper Can Be Inserted, Either

LK4 or LK6)

LK14 and (LK4 or LK6) LK4 or LK6

Evaluation Board User Guide UG-210

Rev. A | Page 5 of 12

EVALUATION BOARD SCHEMATIC AND ARTWORK

09479-001

1D1

2D2

3GND1

VDD2

6RE

7DE

8TXD

GND2

5RXD

4VDD1

GND2

ADM2482_87EBRWZ

J1-1

J1-2

J13

TRANSCENTRE_POE30P

SKD1

SKD2

100nF

LK1

100nF

120r

LK11

LK13

LK12

LK8

LK5

51r

R9 0

LK14

R10

51r

J2-1

J2-2

J8-1

J8-2

J8-3

J8-4

LK2

LK3

LK4

LK6

R7 0

R8 0

100nF

820r LK7

LK9

LK10

LK15

LK16

J4-1

J4-2

J4-3

J4-4

J4-5

J4-6

C11

22uF

C10

10uF

10V

RTS

RXD

TXD

GND1

GND2

X555

VDD1

VDD2

X556

100nF

C9 100nF

820r

R11

820r

RT1

120r

2IN

6SD

OUT

ERR

4GND

ADP3330

22uF

10uF

VDD1

VDD2

VDD1

VDD2

Figure 2. ADM2482E/ADM2487E Evaluation Board Circuit Diagram

UG-210 Evaluation Board User Guide

Rev. A | Page 6 of 12

09479-003

Figure 3. ADM2482E/ADM2487E Evaluation Board Silkscreen

Evaluation Board User Guide UG-210

Rev. A | Page 7 of 12

09479-004

Figure 4. ADM2482E/ADM2487E Evaluation Board Component Side

UG-210 Evaluation Board User Guide

Rev. A | Page 8 of 12

09479-005

Figure 5. ADM2482E/ADM2487E Evaluation Board Solder Side

Evaluation Board User Guide UG-210

Rev. A | Page 9 of 12

ORDERING INFORMATION

BILL OF MATERIALS

Table 2.

Qty Reference Designator Description Supplier/Part Number

1 C1 Capacitor, Size 1210, 22 μF AVX 1210ZD226KAT2A

2 C2, C10 Capacitor, Size 1210, 10 μF AVX 1210ZC106KAT2A

2 C3, C8 Capacitor, Size 0805, 100 nF AVX 08055C104KAT2A

1 C4 Capacitor, Size 0603, 100 nF Do not insert

3 C5, C6, C7 Capacitor, Size 0603, 100 nF AVX CM105X7R104K16AT

1 C9 Capacitor, Size 0603, 100 nF Do not insert

1 C11 Capacitor, CAP\TAJ_B, 22 μF AVX TAJB226K016R

2 J1, J2 CON\POWER Camden CTB5000/2

2 J3, J13 SMB Radiall R114426000

1 J4 CON\POWER6 Wieland Electric 25.161.0653.0

1 J8 CON\POWER4 Camden CTB5000/4

11LK1 to LK16 Header, 2 row, 36 + 36 way Harwin M20-9983646

2 LK1, LK5 JUMPER_2, JUMPER_2_SWAP_AB Harwin M7566-05

4 LK2 to LK4, LK6 JUMPER_3 Harwin M7566-05

9 LK7, LK9 to LK16 Jumper, SIP-2P Harwin M7566-05

1 LK8 JUMPER_2 Harwin M7566-05

4 R1, R5, R6, R10 Resistor, 805, 51 Ω Multicomp MC 0.1W 0805 5% 51R

4 R2 to R4, R11 Resistor, R1/8W, 820 Ω Multicomp MCCFR0W8J0821A20

3 R7, R8, R9 Resistor, R1/2W_NARROW, 0 Ω Wire Link

2 RT, RT1 Resistor, R1/8W, 120 Ω Multicomp MCCFR0W8J0121A20

6 RE, RTS, RXD, TXD, D1, D2 Test point Vero 20-313140

6 T1, T2, A, B, Y, Z Test point Vero 20-313138

3 VDD1, VDD2, X556 Test point Vero 20-313137

3 X555, GND1, GND2 Test point Vero 20-2137

2 SKD1, SKD2 ZPD10, DO35_P, Schottky diode Fairchild Semiconductor 1N5817

1 U1 RS-485 transceiver, 16-lead SOIC_W Analog Devices ADM2482EBRWZ/ADM2487EBRWZ

1 U2 LDO, 6-lead SOT-23 Analog Devices ADP3330

1 U3 SMT power transformer Coilcraft GA3157-AL/Coilcraft DA2303-AL

1Only one header is required per board.

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