Evaluation Board User Guide
UG-043
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
i
Coupler ADuM4160 USB Isolator Evaluation Board
Please see the last page for an important warning and disclaimers.
Rev. 0 | Page 1 of 8
INTRODUCTION
USB use has displaced older communications standards, such
as RS-232, as the default serial communications port in PC-based
systems. When compared to these other standards, USB has
many enhanced features, such as power for peripherals, automatic
driver installation, and higher data rates. However, when using
USB, it is difficult to provide isolation, which has limited its
acceptance in medical and industrial applications.
Analog Devices, Inc., has introduced the
ADuM4160
USB
isolator to address the difficult task of isolating the bus. The
ADuM4160 USB isolator evaluation board was constructed
to allow an easy interface to existing applications by standard
cabling or discrete wiring.
The design goals of this evaluation platform are to
•
Connect to systems through standard USB Type A and
Type B connectors.
•
Draw power from the USB host or from an external 5.0 V
or 3.3 V power supply.
•
Support isolated power for the downstream interface
through an
ADuM5000
iso
Power® dc-to-dc converter.
•
Support external downstream power from a 5 V or 3.3 V
power supply.
•
Provide test points for all power and signal paths.
•
Support low and full speed communications.
•
Support enumeration control.
•
Support external ESD protection.
•
Support common-mode chokes in xD+/xD−.
•
Support ferrite inductors in V
BUSx
and GND
x
lines.
FEATURES OF THE ADuM4160
The ADuM4160 provides support for full speed and low speed
data communications by interfacing directly with the xD+ and
xD− lines. It is designed to be transparent to USB data traffic
other than adding about as much delay as a hub and cable.
Features of the isolator include the following:
•
Built-in voltage regulators allow the ADuM4160 to draw
power from either 5 V or 3.3 V sources.
•
Application of the upstream pull-up resistor is under the
control of a downstream pin, PIN (Pin 12).
•
The operating speed of the isolator is set by pins on the
upstream and downstream sides of the part, SPU and SPD
(Pin 5 and Pin 13, respectively).
The upstream side of the ADuM4160 is Pin 1 through Pin 8,
is connected to the left-hand side of the evaluation board, and
interfaces through a Type B connector. The downstream facing
side is Pin 9 through Pin 16, is connected to the right-hand side
of the evaluation board, and interfaces through a Type A connector.
The evaluation board allows configuration of all of the features of
the ADuM4160 chip as well as providing support for a variety of
possible power schemes. The board also allows common-mode
voltages; however, it is not recommended for performing safety
related testing, such as high voltage withstand testing. Perform this
type of testing on the component level or on a production board.
EVALUATION BOARD
08
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8-
0
0
1
Figure 1. USB Evaluation Board
