UG-317 Datasheet, PDF (3/12 Pages) Analog Devices – Evaluation Board User Guide

Evaluation Board User Guide
UG-317
EVALUATION BOARD HARDWARE CONFIGURATION
TEST SETUP
JUMPER SETTINGS
The ADM2682E/ADM2687E evaluation board is shown
in Figure 2 with the default jumper settings on LK1 through
LK4 (driver and receiver enabled), power connection on J1,
input signal connection on J2, and probes attached to RXD,
TXD, Y, and Z for a loopback test (LK5 and LK6 are closed
to connect A to Y and B to Z).
The inputs to the ADM2682E/ADM2687E can be configured
using the jumpers on the evaluation board (see Table 1). Note
that multiple jumper blocks should not be placed on LK1 to
LK4 because the input sources may be shorted together. For
each link, a single jumper block can be moved from one posi-
tion to another, as specified in Table 1.
SIGNAL
GENERATOR
3.3V OR 5V
POWER
SUPPLY
GND1
J3
RXD
RXD
RE
DE
TXD
TXD
J2
J1
EVAL-ADM2682E_87EEBZ
LK1
A
B
LK2 _A
B
C
D
LK3
A
B
C
LK4
A
B
RXD
RE
DE
TXD
VCC
GND2
A ^LK6
A
B
B
Z _LK5
Z
Y
Y
VISO
SHIELD
J4
OSCILLOSCOPE
Figure 2. Basic Operation of the Evaluation Board for the ADM2682E/ADM2687E Isolated RS-485 Transceivers
Table 1. Jumper Configuration
Link
Connection Description
LK1
A
Connects the receiver output (RxD) of the ADM2682E/ADM2687E to the J3 connector.
B
Connects the receiver output (RxD) of the ADM2682E/ADM2687E to the J8-1 terminal block connector.
LK2
A
Connects the receiver enable input (RE) of the ADM2682E/ADM2687E to VCC. This setting disables the receiver.
B
Connects the receiver enable input (RE) of the ADM2682E/ADM2687E to GND1. This setting enables the receiver.
C
Connects the receiver enable input (RE) of the ADM2682E/ADM2687E to the J8-2 terminal block connector.
D
Connects the receiver enable input (RE) of the ADM2682E/ADM2687E to the driver enable input (DE); that is, the
input for both RE and DE is set by LK3. This setting ensures that when the driver is enabled, the receiver is
disabled, or when the driver is disabled, the receiver is enabled.
LK3
A
B
C
Connects the driver enable input (DE) of the ADM2682E/ADM2687E to VCC. This setting enables the driver.
Connects the driver enable input (DE) of the ADM2682E/ADM2687E to GND1. This setting disables the driver.
Connects the driver enable input (DE) of the ADM2682E/ADM2687E to the J8-3 terminal block connector.
LK4
A
Connects the driver input (TxD) of the ADM2682E/ADM2687E to the J8-4 terminal block connector.
B
Connects the driver input (TxD) of the ADM2682E/ADM2687E to the J2 connector.
LK5
Closed
Connects the ADM2682E/ADM2687E Receiver Input A to Driver Output Y. When LK5 and LK6 are both connected,
the evaluation board is configured for half-duplex operation.
Open
When LK5 and LK6 are both open, the evaluation board is configured for full-duplex operation.
LK6
Closed
Connects the ADM2682E/ADM2687E Receiver Input B to Driver Output Z. When LK5 and LK6 are both connected,
the evaluation board is configured for half-duplex operation.
Open
When LK5 and LK6 are both open, the evaluation board is configured for full-duplex operation.
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