JP14-R-LP & JP14-Q-LP F
ALCOM
GPS R
ECEIVERS
V
ERSION
1.0.0
6.5 DC input signals
VCC
This pin is the main DC power supply for 3,3 V
±
5 %
powered boards JP14-R-LP/Q-LP.
RF_IN
Active antennas have an integrated low-noise
amplifier. They can be directly connected to this pin
(
RF_IN
)
. If an active antenna is connected to
RF_IN
,
the integrated low-noise amplifier of the antenna
needs to be supplied with the correct voltage
through pin
VANT
.
C
aution:
Do not connect or disconnect the antenna
while the JP14-R and JP14-Q are running.
Caution
:
The RF_IN is always fed from the input
voltage on the VANT. Do not use any input voltage
on the RF_IN pin.
VANT
This pin is an input and reserved for an external DC
power supply for an active antenna.
The antenna bias for an external active antenna can
be provided in two ways to pin
VANT
.
In order to use a 5 V or 12 V active GPS antenna, the
VANT
has to be connected to 5 V, 12 V external
power supply, respectively.
The other possibility is available when you connect
the
VCCRF
output (which provides 2.85 V) to
VANT
,
so that an antenna with 2.85 V supply voltage can be
used.
Hint: The input voltage on the
VANT
should be
chosen in according to the antenna to be used.
Note: The GPS receivers JP14-R-LP/Q-LP have to be
connected to active GPS antennas with a max. current
25 mA.
VCCRF
This pin is an output, which pr2.85 V DC, and
can be connected to the V_ANT, to supply the
connected GPS antenna (2,85V active antenna).
Note: The maximum output current on this pin should
be limited upto 25 mA to protect the GPS receiver from
damage.
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