Analog Devices EVAL-ADM2485EB3Z, User Manual

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Evaluation Board User Guide
UG-213
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 Board for the ADM2485 Half-Duplex, Isolated RS-485 Transceiver with
Transformer Driver
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 12
FEATURES
Easy evaluation of the ADM2485
Evaluation of the ADM2485 at 16 Mbps
Easy evaluation of integrated transformer driver
ADM2485 APPLICATIONS
Isolated RS-485/RS-422 interfaces
Process field bus (PROFIBUS) networks
Industrial field networks
Multipoint data transmission systems
EVALUATION KIT CONTENTS
EVAL-ADM2485EB3Z or
EVAL-ADM2485EB5Z
GENERAL DESCRIPTION
The ADM2485 evaluation board allows the ADM2485 isolated
RS-485 transceiver 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.
When the ADM2485 is powered by 3.3 V on the logic side, a
transformer, TI, is required with a turns ratio of 1:2.2
(DA2304_AL) to step up the 3.3 V to 6 V. This ensures that
there is enough headroom for the
ADP667 LDO to output a
regulated 5 V output (EVAL-ADM2485EB3Z).
If the ADM2485 is powered by 5 V on the logic side, a trans-
former, TI, is required with a turns ratio of 1:1.5 (DA2303_AL)
so that there is enough headroom for the
ADP667 LDO to
output a regulated 5 V output (EVAL-ADM2485EB5Z).
EVALUATION BOARD
094
82
-00
6
Figure 1.