EVAL-ADG5248FEBZ User Guide
UG-835
Rev. A | Page 5 of 14
EVALUATION BOARD HARDWARE
Evaluate the operation of the
ADG5248F
using the
EVAL-
ADG5248FEBZ
. Figure 1 shows a typical evaluation setup
where only a power supply and signal generator are required.
Figure 2 shows the block diagram of the main components of
the evaluation board.
Using this evaluation board, the
ADG5248F
passes signals from
either the source or drain connectors. The source pins have fault
detection circuitry that react to an overvoltage event. During an
overvoltage event, the channel where the fault occurs turns off,
and the FF pin pulls low. The SF pin pulls low when the A0/F0,
A1/F1, and EN/F2 pins select the source where the overvoltage
occurs. See the
ADG5248F
data sheet for more details.
POWER SUPPLY
Connector J3 provides access to the supply pins of the
ADG5248F
. The VDD, GND, and VSS screw terminals link to
the appropriate pins on the
ADG5248F
. For dual supply voltages,
power the evaluation board from ±5 V to ±22 V. For single supply
voltages, connect the GND and V
SS
terminals together, and power
the evaluation board with 8 V to 44 V. Additionally, an on-board
LDO regulator is provided for digital control voltage. If necessary,
connect a secondary voltage source to EXT_VL to control the
digital voltages. To use EXT_VL, move the 0 Ω resistor from
R20 to R21. Do not expose the on-board LDO regulator to
voltages greater than 28 V; remove R18 and supply an
alternative digital voltage via EXT_VL if required.
INPUT SIGNALS
Two screw connectors provide access to the source and drain
pins of the
ADG5248F
. Additional Subminiature Version B (SMB)
connector pads are available if extra connections are required. The
ADG5248F
is overvoltage protected on the source side, and each
source terminal (S1 to S8) can be presented with a voltage of up to
+55 V or −55 V. See the
ADG5248F
data sheet for more details.
Each trace on the source and drain side includes two sets of
0603 pads, which can be used to place a load on the signal path
to ground. A 0 Ω resistor is placed in the signal path and can be
replaced with a user defined value. The resistor combined with
the 0603 pads create a simple resistor capacitor (RC) filter.
The
ADG5248F
uses a parallel interface to control the operation of
the switches. The switch operation can be manually controlled
using the SW1 to SW4 switches, or an external controller can be
interfaced directly to the control pins by using the SMB connectors
(EN/F2, A0/F0, A1/F1, and A2) and removing the 0 Ω R54 to
R57 resistors.
OUTPUT SIGNALS
There are two outputs on the
ADG5248F
. The FF pin indicates
when the device is operating 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, A1/F1, and EN/F2 inputs.
For visual indication, LEDs are mounted on the evaluation board.
When the device is operating normally, the FF and SF pins remain
high and LED1 and LED3 illuminate green. If an overvoltage
occurs at any of the source pins, the FF pin pulls low and LED2
illuminates red. If an overvoltage occurs at the source pin selected
by A0/F0, A1/F1, and EN/F2, the SF pin pulls low and LED4
illuminates red.
SMB connectors interface the evaluation board with external
controllers.
