UG-042 Datasheet, PDF (4/8 Pages) Analog Devices – Evaluating the 16-Lead SOIC and the 16-Lead QSOP Digital Isolators

UG-042
EVAL-ADuMQSEBZ User Guide
Figure 4. Side 1 Terminal Block Connector
The power and ground from the screw terminal block (if
installed) are connected to the Side 1 power and ground pads
of the DUT and provide power and ground to pull-up and pull-
down resistors and terminations.
The ADuM640x devices differ from the rest of the isoPower
devices in that they have an additional power supply input on
Pin 7 that replaces the RCOUT pin present on the ADuM5401,
ADuM5402, ADuM5403, and ADuM5404. Bypass and connect
this pin to VDD1 for proper operation of the ADuM640x. It is
recommended that a 0.1 µF capacitor be installed at R5 and a
0 W resistor at R4. The ADuM640x devices are not compatible
with power sharing; therefore, do not install an ADuM5000 at U1
when using the ADuM640x.
Side 2 Power Supply Connections
The Side 2 connections are different from those on Side 1. With
standard iCoupler devices, these connections are power supply
inputs for Side 2. However, with isoPower devices such as the
ADuM540x, these same connections can be power outputs for
off-board circuits. In addition, they can be configured as an
independent power supply for the project area.
Figure 5. Side 2 Terminal Block Connector
Power is connected to the terminal block connector (if installed),
IO_1D, as shown in Figure 5. Power is connected to IO_1D
Pin 1 at the top, and ground is connected to Pin 2. Provisions
for adding in-line inductors for noise isolation or for isolating
the jacks from the on-board power connections were made with
the inclusion of Z6 and Z7. These positions are populated with
0 Ω resistors to connect power from the ADuM540x to the
IO_1D terminal block.
When standard iCoupler isolators are installed, populate the Z6
and Z7 pads with 0 Ω resistors to connect the power jacks to the
power pins of the DUT. Replace these resistors with inductors if
noise isolation is required.
When isoPower devices are installed on the evaluation board,
the power configuration required can vary greatly, depending
on the demands of the application. With 0 Ω resistors or
inductors installed at Z6 and Z7, the power jacks can provide
power from the isoPower device to an external device.
Rev. C | Page 4 of 8