EVAL-ADG5404FEBZ Datasheet, PDF (4/10 Pages) Analog Devices – Protected against overvoltage on source pins

UG-790
EVALUATION BOARD HARDWARE
Use the EVAL-ADG5404FEBZ to evaluate the ADG5404F.
Figure 1 shows a typical setup where only a power supply and
signal generator are required. Figure 2 shows a block diagram of
the main components of the evaluation board.
The connectors on the board pass signals through the ADG5404F
switch. The source pins have fault detection circuitry that reacts
to an overvoltage. During an overvoltage event, the switch turns
off and the FF pin pulls low. The SF pin pulls low when the
source where the overvoltage occurs is the one selected by the
A0/F0 and A1/F1 pins. See the ADG5404F data sheet for
further details.
POWER SUPPLIES
Connector J3 provides access to the supply pins of the ADG5404F.
VDD, GND, and VSS link to the appropriate pins on the
ADG5404F. For dual-supply voltages, power the evaluation board
from ±5 V to ±22 V. For single-supply voltages, connect the
GND and VSS terminals and power the evaluation board with
8 V to 44 V. Additionally, an on-board LDO regulator provides
for digital control voltage. If necessary, connect a secondary
voltage source to DC_V1 and use it as the digital control
voltage. To use DC_V1, set the header at LK5 to Position A.
INPUT SIGNALS
Two screw connectors connect the source and drain pins of the
ADG5404F. If extra connections are required, additional
Subminiature Version B (SMB) connector pads are laid out.
The ADG5404F is overvoltage protected on the source side, and
the maximum voltage that can be applied to S1 through S4 is
−55 V or +55 V. See the ADG5404F data sheet for more details.
Each trace on the source and drain side includes two sets of
gold pin connectors for placing a load on the signal path to
ground. Place a 0 Ω resistor in the signal path, or it can be
replaced with a user defined value. Use the resistor combined
EVAL-ADG5404FEBZ User Guide
with the gold pin connectors to create a simple resistor/capacitor
(RC) filter.
Use parallel interface channels (A0/F0 and A1/F1) to control the
operation of the ADG5404F switches. Use the headers on LK2
through LK4 to manually control the operation of the switches,
or connect an external controller directly to the control pins by
using the SMB connectors (A0/F0, A1/F1, and EN) and by
removing the link headers on LK2 through LK4.
OUTPUT SIGNALS
The ADG5404F has two outputs. The FF pin indicates when the
device operates normally or whether there is an overvoltage
fault on one of the source pins. The SF pin also indicates when
an overvoltage occurs on one of the source pins and transitions
low only when an overvoltage occurs on the channel selected by
the A0/F0 and A1/F1 inputs. For visual indication, an LED is
mounted on the evaluation board. Use LK8 to connect the LED
circuit. When the device operates normally, the FF pin remains
high, and the LED turns on. If an overvoltage occurs at any of
the source pins, the FF pin pulls low, and the LED turns off.
The LK9 selector allows the user to choose which output controls
the LED. Setting the header to Position A allows the FF pin to
control the LED. Setting the header to Position B, the SF pin
controls the LED.
SMB connectors can interface the evaluation board with external
controllers, and two gold pin connectors can connect a pull-up
resistor between the FF and SF signals and the digital supply.
The DR pin allows the user to choose the state of the drain pin
when the device deactivates during an overvoltage. The LK1
selector allows the user to choose between open circuit and pulling
to the rails.
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