GPS receiver A1080-A
10.3 VANT Pin (antenna voltage input pin)
The VANT pin is an input pin.
The supply voltage for an active GPS antenna has to be fed into the Vant pin.
The easiest way to do that is to connect Vcc to VANT. The maximum current is
50mA.
Note
: Shortcut between ANT and GND may damage the A1080-A GPS receiver
module. This should be avoided by using an antenna current limiter.
Please find proposal for simple current limiter below. If other transistors are used,
other resistor values may be necessary as well. We strongly recommend simulating
and testing your realized version before using it.
The little schematics below work for Vcc from 3V to 5V. The antenna current will be
limited to around 50mA.
Figure 13: Application note: Antenna current limiter
Page 24 of 31
User’s Manual
V2.3 - 07/07
