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Evaluation Board User Guide
DATA I/O CONNECTIONS
Side 1 Data I/O
Signals can be provided to the board and routed to the required
input pins through the IO_1C terminal block connector, as
shown in Figure 4. Four channel inputs/outputs can be connected
from IO_1C Pin 3 through IO_1C Pin 6 to the respective A, B,
C, and D channels of the ADuM540x.
Signals from the IO_1C terminal block connector channels can
also be routed to some of the other data lines through the JP1A
and JP1B jumper blocks (these jumper blocks correspond to
BNC Channel A and Channel B, if you populate them). Each
jumper block allows a channel signal from the IO_1C terminal
block to be connected to additional data input lines by configuring
the jumpers. The jumper blocks can also be used to wrap
signals from an i Coupler output back to an input by using the
JP1A or JP1B block to cross-connect inputs and outputs.
A common way to provide signals is with a function generator
through 50 Ω coax cables. The ADuM540x board has a layout
UG-042
DESIGN AREA
The design area of the evaluation board is provided to allow
breadboarding of application components such as RS-485 and
CAN transceivers, ADC or DAC components with direct
interconnects. The design area, as shown in Figure 6, accepts
most surface-mount narrow- and wide-body components with
50 mil and 100 mil pitch, as well as narrow- and wide-body
300 mil DIP through-hole devices. These surface-mount discrete
components and jumper wires can be used to complete a wide
variety of circuits.
The design area has convenient connection points to the
primary data path, CHA to CHD, of the i Coupler, as well as
power connections for V ISO and GND ISO . To allow signals from
the design area to be routed to the IO_1D terminal block,
remove the 0 Ω resistors for R23 through R26. Note that no
ground plane is provided in the design area.
V ISO
Z6
position at IO_1A and IO_1B for adding two BNC connectors,
but these are not provided with the board. You can purchase the
coax cables (Tyco AMP 227699-2) and populate these BNC
connectors. In addition, to have 50 Ω terminations on the board
for the added BNC connectors, a 50 Ω through-hole resistor
should be added at the R1 and R2 positions. It is possible to
route data outputs to this connector as well, but it is not recom-
mended because proper termination is not possible for logic level
signals, and improper termination can cause severe ringing on
the output lines.
The Side 1 I/O structure also includes pull-up/pull-down/load
positions, R7 through R14. Discrete through-hole resistors and
capacitors can be installed at these positions to simulate most
loading conditions or to provide pull-ups for open collector
outputs.
GND ISO
CHA
CHB
CHC
DESIGN AREA
Z7
CHA
CHB
CHC
Side 2 Data I/O
Signals can be provided to the board and routed to the required
input pins through the IO_1D terminal block connector, as
shown in Figure 5. It consists of terminal block connections that
CHD
R23
CHD
IO_1D
1
operate like the Side 1 structures. The terminal block connections
can also be used to wrap signals from an i Coupler output back
to an input.
R25
R24
R26
In addition to the off-board I/O connections, each data channel
is provided with through-hole connections to the design area.
Rev. A | Page 5 of 8
V ISO
Figure 6. Design Area
8
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