Evaluation Board Circuitry; Pcb Evaluation Functions; Connectors; Power Input - Analog Devices EVAL-3CH4CHSOICEBZ User Manual

UG-935

EVALUATION BOARD CIRCUITRY

PCB EVALUATION FUNCTIONS

The EVAL-3CH4CHSOICEBZ
iCoupler® data transfer functions, powers each side of the
iCoupler isolator independently, and applies high differential
voltages between the two sides of the isolator. The board is
intended for evaluation of the components, but has not been
safety certified for high voltage operation. If differential voltages
above 60 V are applied, external safety measures appropriate for
the voltage must be in place.
The evaluation board comes with power terminals, bypass
capacitors, and header pins installed. The compatible iCoupler
digital isolator must be ordered and installed separately. The
EVAL-3CH4CHSOICEBZ is compatible with triple- and quad-
channel iCoupler standard data isolator devices, including the on-
off keying architecture devices such as the ADuM130D/
ADuM130E/ADuM131D/ADuM131E
ADuM140E/ADuM141D/ADuM141E/ADuM142D/ADuM142E
in 16-lead SOIC_W and 16-lead SOIC_N packages. Figure 2
shows a general footprint of a supported device, showing the data
channel, power, and ground pins.
V 1
DD1
2
GND
1
ENCODE
3
V
IA
4 ENCODE
V
IB
V
5 DECODE
OC
V
OD 6 DECODE
DISABLE /V
7
1 E1
GND
8
1
Figure 2. Functional Block Diagram of the

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, it is possible to make temporary and
permanent connections to the board.
When coaxial connections are required, SMA connector positions
are available for digital input and output signals and VDD1 and
VDD2 power supplies. The SMA connector positions must be
ordered from a distributor separately. Figure 3 shows examples of
installed SMA connectors; these connectors are not only low
profile and provide excellent mechanical connections to the
PCB but also support 50 Ω coaxial cabling.
board evaluates the full range of
and ADuM140D/
16 V
DD2
15
GND
2
DECODE
14
V
OA
DECODE 13
V
OB
V
ENCODE 12
IC
V
ENCODE 11 ID
DISABLE /V
10
2 E2
GND
9
2
ADuM140D/ADuM140E
EVAL-3CH4CHSOICEBZ User Guide
2) SMA CONNECTOR
5) SCOPE PROBE
HEADER
Power can be connected through the J1 and J2 (Terminal 1 power,
Terminal 2, and GND, as marked on silkscreen) terminal blocks or
the optional VDD1 and VDD2 SMA connectors. Signals can be
routed in or out of the board with the provided header pins or
optional SMA connectors. The pin spacing of each through-hole
connector is 0.1 inch between centers. There are additional signal
test points with 0.2 inch spacing provided for active scope
probes. These header pins must be added separately. Installed
probe points are shown in Figure 3.

POWER INPUT

Each side of the iCoupler standard data isolator requires an off-
board power source. The power source must be independent if
common-mode voltages are applied across the isolation barrier
or damage may occur to the power supply.
Divided power and ground planes are present on Layer 2 and
Layer 3 of the PCB on each side of the isolation barrier shown
in Figure 7 and Figure 8. Power connects to VDD1 for Side 1
and to VDD2 for Side 2.

DATA INPUT/OUTPUT STRUCTURES

Each data channel has a variety of structures to configure, load,
and monitor both the input and output. Figure 4 shows an example
of the routing from an external connection to a DUT data
channel. Each data channel has similar connections available.
Starting at the external connection, the signal path is
constructed as follows:
•
A pad layout for a PCB board, edge-mounted SMA
connector.
•
Two 0805 pads are provided where 100 Ω resistors to
ground can be installed. The combined resistance is 50 Ω
to provide a termination for a standard coaxial cable.
•
A standard 0805 pad layout where the coaxial and termination
structures can connect to the rest of the signal path.
•
A 0603 pad layout between the signal path and
VDD1/VDD2 for a pull-up resistor.
Rev. 0 | Page 4 of 10
1) SCOPE PROBE
Figure 3. Optional Components
3) TERMINAL
BLOCK
6) PADS TO
CONNECT SMA
4) SHORTING
JUMPER