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ADUM4160 Arkusz danych(PDF) 11 Page - Analog Devices

Numer części ADUM4160
Szczegółowy opis  Full/Low Speed 5 kV USB Digital Isolator
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ADuM4160
Rev. C | Page 11 of 16
In a fully compliant application, a downstream facing port must
be able to detect whether a peripheral is low speed or full speed
based on the application of the upstream pull-up. The buffers
and logic conventions must adjust to match the requested speed.
Because the ADuM4160 sets its speed by hard wiring pins, the
part cannot adjust to different peripherals on the fly.
The practical result of using the ADuM4160 in a host port is
that the port works at a single speed. This behavior is acceptable
in embedded host applications; however, this type of interface is
not fully compliant as a general-purpose USB port.
Isolated cable applications have a similar issue. The cable operates
at the preset speed only; therefore, treat cable assemblies as
custom applications, not general-purpose isolated cables.
POWER SUPPLY OPTIONS
In most USB transceivers, 3.3 V is derived from the 5 V USB
bus through an LDO regulator. The ADuM4160 includes internal
LDO regulators on both the upstream and downstream sides.
The output of the LDO is available on the VDD1 and VDD2 pins.
In some cases, especially on the peripheral side of the isolation,
there may not be a 5 V power supply available. The ADuM4160
has the ability to bypass the regulator and run on a 3.3 V supply
directly.
Two power pins are present on each side, VBUSx and VDDx. If 5 V
is supplied to VBUSx, an internal regulator creates 3.3 V to power
the xD+ and xD− drivers. VDDx provides external access to the
3.3 V supply to allow external bypass as well as bias for external
pull-ups. If only 3.3 V is available, it can be supplied to both
VBUSx and VDDx. This disables the regulator and powers the
coupler directly from the 3.3 V supply.
Figure 5 shows how to configure a typical application when the
upstream side of the coupler receives power directly from the
USB bus and the downstream side is receiving 3.3 V from the
peripheral power supply. The downstream side can run from a
5V VBUS2 power supply as well. It can be connected in the same
manner as VBUS1 as shown in Figure 5, if needed.
PRINTED CIRCUIT BOARD LAYOUT (PCB)
The ADuM4160 digital isolator requires no external interface
circuitry for the logic interfaces. For full speed operation, the
D+ and D− line on each side of the device requires a 24 Ω ± 1%
series termination resistor. These resistors are not required for
low speed applications. Power supply bypassing is required at
the input and output supply pins (Figure 5). Install bypass
capacitors between VBUSx and VDDx on each side of the chip. The
capacitor value should have a value of 0.1 µF and be of a low
ESR type. The total lead length between both ends of the
capacitor and the power supply pin should not exceed 10 mm.
Bypassing between Pin 2 and Pin 8 and between Pin 9 and
Pin 15 should also be considered, unless the ground pair on
each package side is connected close to the package.
VBUS1
GND1
VDD1
PDEN
SPU
UD–
UD+
GND1
VBUS2
GND2
VDD2
SPD
PIN
DD–
DD+
GND2
ADuM4160
VBUS1 = 5.0V INPUT
VDD1 = 3.3V OUTPUT
VBUS2 = 3.3V INPUT
VDD2 = 3.3V INPUT
Figure 5. Recommended Printed Circuit Board Layout
In applications involving high common-mode transients, it is
important to minimize board coupling across the isolation
barrier. Furthermore, design the board layout such that any
coupling that does occur equally affects all pins on a given
component side. Failure to ensure this can cause voltage
differentials between pins exceeding the absolute maximum
ratings of the device, thereby leading to latch-up or permanent
damage.
DC CORRECTNESS AND MAGNETIC FIELD
IMMUNITY
Positive and negative logic transitions at the isolator input
cause narrow (~1 ns) pulses to be sent to the decoder via the
transformer. The decoder is bistable and is, therefore, either set
or reset by the pulses, indicating input logic transitions. In the
absence of logic transitions at the input for more than about
12 USB bit times, a periodic set of refresh pulses indicative of
the correct input state are sent to ensure dc correctness at the
output. If the decoder receives no internal pulses for more than
about 36 USB bit times, the input side is assumed to be unpowered
or nonfunctional, in which case the isolator output is forced to a
default state (see Table 10) by the watchdog timer circuit.
The limitation on the magnetic field immunity of the ADuM4160
is set by the condition in which induced voltage in the receiving


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