Bypass On The Pcb; High Voltage Capability - Analog Devices EVAL-3CH4CHSOICEBZ User Manual

EVAL-3CH4CHSOICEBZ User Guide
•
A populated 2-pin header provides a signal ground pair
that can be used for clip leads or shorting a channel to
ground temporarily.
•
There are groupings of three open through holes, consisting
of a signal and two ground connections. These holes can be
used for hardwiring signal wires into the PCB, installing a
header to accept an active probe, or installing a 2-pin header
to allow adjacent channels to temporarily be shorted together.
•
A 0805 pad layout between the signal and ground where a
load capacitor or resistor can be installed.
Figure 3 shows many of the optional components installed as well
as how jumpers can temporarily connect channels. The figure
shows a signal connecting to the first-channel SMA and fanning
out to the top three channels, monitored by an active scope probe.
Figure 4. Configuration and Monitoring Structures (Showing a Datapath from an External Connection to the DUT Pin)
1 SMA CONNECTOR PADS
2 TERMINATION
6 OPEN THROUGH HOLES
FOR ACTIVE PROBES
GND/GND/SIGNAL
5 2-PIN HEADER
GND/SIGNAL
Rev. 0 | Page 5 of 10

BYPASS ON THE PCB

Optional surface-mount bulk capacitors, C1 and C14, are
installed near the power connectors compensate for long cables
to the power supply. Bypass capacitors, C7 and C8, are installed
near the iCoupler isolator and consist of a 0.1 µF capacitor for
both DUT power supply pins.
The PCB also implements a distributed capacitive bypass. The
capacitive structure consists of power and ground planes spaced
closely on the inner layers of the PCB. This minimizes noise
and the transmission of electromagnetic interference (EMI)
without using complex design features.

HIGH VOLTAGE CAPABILITY

The PCB is designed in adherence with 2500 V basic insulation
practices. High voltage testing beyond 2500 V is not recommended.
The evaluation board must not be relied on for safety functions.
3 CONNECT TO SMA
4 PULL-UP
7 LOAD
UG-935