Analog Devices ADM2495E User Manual

Evaluating the ADM2495E 5.7kV
FEATURES
Simplified evaluation of the ADM2495E/ADM2495E-1 250kbps
►
half-duplex isolated RS-485 transceiver
2-layer PCB compliant to EN 55032 Class B radiated emissions
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Footprint for 10mm × 10mm, 16-lead SOIC_W package with
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>8.0mm creepage and clearance
On-board ADP7104 LDO regulators with jumper options for
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simplified evaluation in multiple supply configurations
Flexible, low voltage V
►
DD1
nodes as low as 1.7V
IEC 61000-4-2 ESD protection on the A pin and B pin
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±4kV contact discharge
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SMA connector for TxD input signal
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Optional on-board LTC6900
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Screw terminal blocks for connecting power, digital, and RS‑485
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signals
Jumper-selectable enable and disable for digital input signals
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Resistors and footprints for termination
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Test points for measuring all signals
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EVALUATION BOARD CONTENTS
EVAL-ADM2495EEBZ
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EQUIPMENT NEEDED
Oscilloscope
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Signal generator (optional)
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3 V to 5.5 V supply
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1.7 V to 5.5 V supply (optional)
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GENERAL DESCRIPTION
The EVAL-ADM2495EEBZ allows simplified, efficient evaluation
of the ADM2495E 5.7kV , 250kbps half-duplex signal isolated
RMS
RS-485 transceiver. The EVAL-ADM2495EEBZ can also be used to
evaluate the higher speed 20Mbps ADM2495E-1 by replacing the
low-speed part with the higher speed part.
The EVAL-ADM2495EEBZ comes with options for the evaluation
of the ADM2495E/ADM2495E-1 device in an individual system.
Digital and RS-485 bus signals are easily accessible via the screw
terminal blocks on the EVAL-ADM2495EEBZ. Each digital input can
be configured via the on-board jumper options.
Two on-board ADP7104 low dropout (LDO) regulators accept an
input voltage of up to 20V and output a range of selectable
supply voltages to the V and V
DD1
er options. The LDO regulators can be bypassed to power the
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Isolated, Half-Duplex RS-485 Transceiver with Fault Protection
RMS
supply rail for interfacing with I/O
oscillator for providing TxD signal
pins, configurable via jump-
DD2
User Guide | EVAL-ADM2495E
ADM2495E/ADM2495E-1 V
DD1
external power supplies.
The flexible V pin primary side logic supply allows the device to
DD1
operate with a digital input/output (I/O) voltage from 1.7V to 5.5V,
which enables communication with modern processors using either
a 1.8V or 2.5V power supply.
Different methods can be used to provide the transmit data input
(TxD) data input signal to the device. An optional
tor is included on the EVAL-ADM2495EEBZ and can be configured
to provide a clock signal as the TxD digital input within a 10kHz
to 20MHz range. Jumper settings allows frequency selections of
10kHz, 100kHz, 1MHz, 10MHz or TBD based on the value of
a customer installed 0603 resistor. Note that frequencies above
125kHz are intended for when the higher speed ADM2495E-1 part
is installed. A terminal block allows an easy wired connection to
a microcontroller or processor. For optimal signal integrity, use the
on-board subminiature version A (SMA) connector to connect an
external data signal.
The EVAL-ADM2495EEBZ has a footprint for the ADM2495E/
ADM2495E-1 half-duplex, isolated, RS-485 transceiver in a 10mm
× 10mm, 16‑lead, small outline, wide-body (SOIC_W) package.
Table 1 shows the available devices that can be evaluated using
the EVAL-ADM2495EEBZ.
Table 1. List of Available Devices for Evaluation
Device Isolation Rating
ADM2495E 5.7kV
RMS
ADM2495E-1 5.7kV
RMS
For full details on the ADM2495E/ADM2495E-1, see the
ADM2495E/ADM2495E-1 data sheet, which must be used in con-
junction with this user guide when using the EVAL-ADM2495EEBZ.
UG-2304
and V supply pins directly from
DD2
LTC6900 oscilla-
Maximum Data Rate
250kbps
20Mbps
Rev. A | 1 of 11