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DC
-
0017105
4
MADR-011022
Rev. V2
-10 V to -25 V Driver for PIN Diode Switches
Internal Power Sequencer
For normal operation, negative bias should be
applied to V
EEB
(pin 6). The sequencer output V
SEQ
should be connected to the driver die negative bias
V
EEA
, with a 47 pF shunt capacitor, as shown in the
application schematic next page. The voltage rating
of this 47 pF capacitor should be sufficient according
to the operating V
EEB
.
When detected V
CC
is above the power sequencer
threshold, the negative bias V
EEB
will be passed to
the driver. When detected V
CC
is below the power
sequencer threshold, the power sequencer will pull
V
EEA
to ground to disable the driver.
Handling Procedures
Please observe the following precautions to avoid
damage:
Static Sensitivity
These electronic devices are sensitive to
electrostatic discharge (ESD) and can be damaged
by static electricity. Proper ESD control techniques
should be used when handling these HBM class 1B
devices.
Driver 1
Driver 2
EN
DS
C2
C1
EN
DS
C2
C1
V
CC
A1
B1
A2
B2
EN
C1
C2
Driving SP3T and SP4T Switches
Two drivers are needed to drive a SP3T or SP4T
switch. The DS pin of the first driver can be left open
due to the internal active pull
-
down. Connect the DS
pin of the second driver to V
CC
. See the figure below
for how to connect C1, C2, and EN. The combined
truth table is below:
Truth Table for Driving SP3T and SP4T
Inputs
Outputs
EN
C2
C1
A1
B1
A2
B2
1
X
X
H
H
H
H
0
0
0
L
H
H
H
0
0
1
H
L
H
H
0
1
0
H
H
L
H
0
1
1
H
H
H
L
Driving SPDT Switches
When driving SPDT switches, use C1 and EN as the
control inputs. Output A is the non
-
inverting output,
and output B is the inverting output. The unused
controls DS and C2 can be left open due to the
internal active pull
-
down. If an all
-
off RF state is not
required, leaving the EN pin open will automatically
enable the driver due to the internal active pull
-
down. The truth table is simplified as follows when
DS and C2 are left open:
Truth Table for Driving SPDT
EN
A
B
C1
1
X
H
H
0
L
H
0
0
H
L
1
