EVAL-CN0159-EB1Z Analog Devices Inc, EVAL-CN0159-EB1Z Datasheet - Page 3

• Manufacturer Part Number: EVAL-CN0159-EB1Z
• Description: BOARD, EVAL, FOR CN0159
• Manufacturer: Analog Devices Inc
• Type: USB Cable Isolatorr
• Series: -r

Specifications of EVAL-CN0159-EB1Z

• Kit Contents: Board
• Mcu Supported Families: CN0159
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Silicon Manufacturer: Analog Devices
• Silicon Core Number: CN0159
• Design Resources: USB Cable Isolator Circuit (CN0159)
• Main Purpose: Interface, Isolator USB Cable
• Embedded: No
• Utilized Ic / Part: ADuM1100, ADuM4160, ADuM5000
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Circuit Note
CIRCUIT DESCRIPTION
Power for the upstream USB connector is derived from the 5 V
VBUS voltage available on the USB cable. The bus voltage also
drives an ADuM5000, which is used to create a VBUS2 voltage
for the downstream side of the
of power for the peripheral. The
its high isolation voltage and small form factor. It provides
sufficient power to operate small bus-powered devices such as a
mouse, keyboard, and memory stick. Because this component
uses chip-scale micro transformers, the internal switching
frequencies are very high, and designs must be able to minimize
radiated emissions by using ferrite beads on the cable well
and following recommendations referred to in the
Application
techniques must be employed to pass system EMI/RFI tests.
See
layout and Gerber files are available for the
isolation board at
The
for power, bus speed, and ESD/EOS protection that must be
determined. Peripheral devices run at one of three speeds,
low (1.5 Mbps), full (12 Mbps), and high (480 Mbps). The
ADuM4160
handshaking signals that are used to negotiate that speed.
High speed mode starts as a full speed configuration; the
peripheral requests high speed support through a process
called a high speed chirp. The
speed chirp; therefore, the request for high speed operation is
never passed to the host, and the peripheral automatically
continues to work at full speed. This application includes a
switch and a single channel isolator that allows the user to select
a cable speed of full or low by setting the SPU and SPD pins.
This feature is optional if single speed operation is adequate.
Tutorial MT-031
ADuM4160
Note. Specific layout, decoupling, and grounding
does not support high speed operation and blocks
http://www.analog.com/CN0159-DesignSupport.
isolated cable application has several options
and
Tutorial MT-101
ADuM4160
ADuM4160
ADuM5000
for guidance. Complete
ADuM4160
ignores the high
with up to 100 mA
was chosen for
AN-0971
USB cable
Figure 2. Isolated Cable Box
Rev. A | Page 3 of 5
Power is provided through the VBUSx pins. The 3.3 V signaling
voltage is created by internal 3.3 V regulators at the VDDx pin.
The
examined in other circuit notes. In the circuit shown in Figure 1,
both the upstream and downstream sides of the
set to derive power from the VBUSx lines and the internal
regulators.
The
upstream pull-up under control of the peripheral. This function
is controlled by the PIN input. In this application, the PIN input
is shorted high so that the upstream pull-up is applied as soon
as peripheral power is applied.
Protection devices are used in this circuit. These were chosen
from manufacturers that have a wide variety of components
available; the particular components were chosen to allow them
to be replaced by 0 Ω shorts, removing them from the circuit.
The choice of protection should be reviewed by the designer
and can range anywhere from not needing external protection
to needing a full complement of transient suppressors and filter
elements. The circuit elements included in this application show
what type of protection can be used.
When the circuit is functioning, packets are detected and data
Data shown in Figure 3 and Figure 4 show a typical full speed
transaction both as time domain data and as an eye diagram.
Features to note in the real-time data are the passive idle state at
the start of the packet, which transitions to a driven J, and then
the end of packet at the end of the transaction that shows as a
single-ended zero state followed by an idle J. It is the automatic
flow of control and the handling of these special logic states
that make the
marketplace.
is shuttled from one side of the isolation barrier to the other.
ADuM4160
ADuM4160
ADuM4160
supports other power configurations that are
has an option to delay application of the
chip possible and unique in the
ADuM4160
CN-0159
are