EVAL-ADuM3151Z User Guide UG-720
EVALUATION BOARD CIRCUITRY
PCB EVALUATION GOALS
The E VA L-ADuM3151Z board is intended to achieve the
following goals:
• Evaluate the full range of SPIsolator data transfer
functions.
• Power each side of the SPIsolator isolator independently.
• Allow high differential voltage to be applied between the
two sides of the SPIsolator isolator.
• Allow connecting easily to power, other circuit boards and
instrumentation.
Although the evaluation board comes with the ADuM3151BRSZ
SPIsolator digital isolator installed, the board is also compatible
with the ADuM3151ARSZ. ADuM3152ARSZ, ADuM3152BRSZ,
ADuM3153ARSZ, and ADuM3153BRSZ.
CONNECTORS
The PCB provides support for three types of interconnections:
• SMA edge-mounted connectors.
• Through-hole signal ground pairs.
• Terminal blocks for power connections.
With these three options, both temporary and permanent
connections to the board can easily be made.
When coaxial connections are desired, SMA connector positions
are available for V
DD1
and V
DD2
power supplies, as well as all
digital inputs. These SMA connector positions are left
unpopulated so that the user can customize the connectors
for a given application.
Pins that are outputs only may not have access to a coaxial
connection. The native output buffers of the ADuM3151/
ADuM3152/ADuM3253 are not capable of driving a 50 Ω coaxial
terminated cable. Bring out signals leaving the board through the
provided through holes or headers.
Figure 2 shows examples of installed SMA connectors; these
connectors were chosen because they are not only low profile
and provide excellent mechanical connections to the PCB but
also support 50 Ω coaxial cabling. Because most lab equipment is
compatible with BNC connectors, adaptors may be required to
use some on-board connectors.
Figure 2. Optional Components
Power can be connected through the T1 and T2 terminal blocks or
can be wired directly to the PCB via the PR1 and PR2 through-
hole positions or the VDD1 and VDD2 SMA connectors can be
populated to connect the coaxial cable. Each through-hole pair
provides a power and ground with the power on the Pin 1 hole.
The pin spacing of each through-hole connector is 200 mil
between centers. This matches the pin spacing required for
Tektronix active scope probes. If a scope probe connection is
desired, the header shown in Figure 2 can be soldered into the
through-hole positions, and the signal pin can be trimmed to
match the height requirements of a Tektronix active scope probe.
POWER INPUT
Each side of the EVA L -ADuM3151Z SPIsolator isolator requires
an off-board power source. Each power source must be
independent if common-mode voltages are to be applied across
the isolation barrier. Sharing a single supply for both sides of the
part across the isolation barrier does not harm the isolator, and it
is useful for functional testing of the ADuM3151 SPIsolator
isolator when common-mode voltages are not present.
A ground plane and a power plane are present on Layer 2 and
Layer 3 of the PCB on each side of the isolation barrier. Power
connects to the V
DD1
and GND
1
planes
for Side 1 and connects
to the V
DD2
and GND
2
planes for Side 2.
SCOPE PROBE
SCOPE PROBE HEADER
SMA CONNECTOR
PADS TO
CONNECT
SMA
SHORTING
JUMPER
12437-002
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