EVAL-ADG5462FEBZ Datasheet, PDF (5/12 Pages) Analog Devices – Protected against overvoltage on source pins

EVAL-ADG5462FEBZ User Guide
EVALUATION BOARD HARDWARE
To evaluate the ADG5462F use the EVAL-ADG5462FEBZ.
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.
In this evaluation board, the ADG5462F 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 on which the fault occurs
turns off, and the FF pin pulls low. See the ADG5462F data
sheet for more details.
POWER SUPPLY
Connector J3 provides access to the supply pins of the ADG5462F.
VDD, GND, and VSS link to the appropriate pins on the
ADG5462F. For dual-supply voltages, the EVAL-ADG5462FEBZ
is powered from ±5 V to ±22 V. For single-supply voltages, the
GND and VSS terminals are connected together to power the
EVAL-ADG5462FEBZ from 8 V to 44 V. Additionally, an on-
board LDO regulator provides the digital control voltage. If
necessary, connect a secondary voltage source to EXT_VL and
use it 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.
UG-908
INPUT SIGNALS
Two screw connectors connect to both the source and drain
pins of the ADG5462F. Additional subminiature Version B
(SMB) connector pads are available if extra connections are
required. The ADG5462F is overvoltage protected on the source
side, and each source terminal (S1 to S4) can be presented with a
voltage of up to +55 V or to −55 V. See the ADG5462F data sheet
for more details.
Each trace on the source and drain side includes two sets of
0603 pads, which 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 creates a simple resistor capacitor (RC) filter.
OUTPUT SIGNALS
The FF pin indicates when the device is operating normally or
whether there is an overvoltage fault on one of the source pins.
For visual indication, LEDs are mounted on the EVAL-
ADG5462FEBZ. When the device operates normally, the FF pin
remains high, and LED1 illuminates green. If an overvoltage
occurs at any of the source pins, the FF pin pulls low, and LED2
illuminates red.
Rev. 0 | Page 5 of 12