Analog Devices EVAL-ADM2482EEB3Z User manual

Evaluation Board User Guide
UG-210
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •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
V
DD1
IN OUT
GND
SD ADP3330
B
A
R
T
Z
Y
RE
D1 D2
ADM2482E/ADM2487E
OSC
+3.3V ISO
LDO
RECTIFIER
POWER
CONNECTOR
CENTER TAPPED
TRANSFORMER
LOGIC
CONNECTO
R
DE
TxD
RxD
V
DD1
GND
1
GND
2
GND
1
GND
2
GND
2
V
DD2
BUS
CONNECTO
R
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
16
VDD2
6RE 7DE 8TXD
15
GND2
14
A
13
B
12
Z
11
Y
10
NC
5RXD 4VDD1
9
GND2
U1
ADM2482_87EBRWZ
J1-1 J1-2
J3
J13
1 2 3 45
6 7 8
U3
TRANSCENTRE_POE30P
SKD1 SKD2
C3
100nF
A B
LK1
A
C4
C5
100nF
RT
120r
LK11
LK13
LK12
A B
LK8
A B
LK5
R1
51r
R5
51r
R6
51r
R9 0
LK14
R10
51r
J2-1 J2-2
J8-1 J8-2 J8-3 J8-4
A
B C
LK2
A
B C
LK3
A
B C
LK4
A
B C
LK6
R7 0 R8 0
C8
100nF
R2
820r LK7
LK9
LK10
LK15
LK16
J4-1 J4-2 J4-3 J4-4 J4-5 J4-6
+
C11
22uF
C10
10uF 10V
B Z Y
D1 D2
RE
RTS
RXD
TXD
GND1
GND2
X555
T1
T2
VDD1
VDD2
X556
C6
100nF
C7
100nF
C9 100nF
R3
820r
R4
820r
R11
820r
RT1
120r
2IN 6SD
1
OUT
3
ERR
5
NR
4GND
U2
ADP3330
+
C1 22uF
+
C2 10uF
VDD1 VDD1
VDD1
VDD2
VDD1
VDD1 VDD1
VDD2
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.
RELATED LINKS
Resource Description
ADM2482E Product Page, 2.5 kV Signal Isolated, ESD Protected, Full/Half Duplex RS-485 Transceiver w/ Transformer Driver (16 Mbps)
ADM2487E Product Page, 2.5 kV Signal Isolated, ESD Protected, Full/Half Duplex RS-485 Transceiver w/ Transformer Driver (500 kbps)
ADP3330 Product Page, High Accuracy Ultralow I(Q), 200 mA, SOT-23, anyCAP® Low Dropout Regulator

UG-210 Evaluation Board User Guide
Rev. A | Page 10 of 12
NOTES