NuPower
TM
Mini
Multi
‐
Octave
PA
User
Manual
Rev
1.4
8
Figure
4:
Micro
‐
D
Socket
Locations
4.2
DC
POWER
The
nominal
supply
voltage
for
the
NuPower
Mini
MOPA
is
+28
VDC;
however,
the
amplifier
module
is
able
to
support
operation
over
a
supply
voltage
range
of
+11
to
+32
VDC.
4.3
GROUND
The
signal
and
power
grounds
are
tied
together
in
the
PA
module.
4.4
RF
ENABLE
This
signal
is
the
logic
control
input
that
designates
whether
the
unit
is
in
transmit
or
standby
mode.
The
RF
Enable
line
is
pulled
high
internally
placing
the
PA
module
in
standby
mode.
If
the
pin
is
left
floating
(i.e.
not
connected),
the
unit
will
default
to
standby
mode.
Grounding
the
pin
(i.e.
a
voltage
below
+0.2
VDC)
places
the
unit
in
transmit
mode.
The
user
can
either
connect
the
RF
Enable
line
to
pins
3
&
4
on
the
CTRL/PWR
interface
connector,
or
an
open
drain
logic
line
capable
of
sinking
500
µ
A
to
place
the
unit
in
transmit
mode.
4.5
TEMP
FLAG
This
signal
is
an
output
to
indicate
an
over
‐
temperature
condition
in
the
NuPower
Mini
MOPA.
A
logic
high
(+5
VDC)
indicates
normal
operation,
while
a
logic
low
(0
VDC)
indicates
an
over
‐
temperature
condition.
The
NuPower
Mini
MOPA
incorporates
internal
logic
circuitry
that
turns
off
the
DC
bias
to
the
RF
transistors.
Caution:
The
amplifier
should
be
shut
down
and
allowed
to
cool
off
when
the
over
‐
temperature
flag
is
set
high
to
avoid
damage
to
the
module.
