MAX-M5Q - Hardware Integration Manual
FTX-HW-13008
Objective Specification
Design
Page 21 of 40
4.2.2
Active antenna design not using antenna supervisor
Active antennas have an integrated low-noise amplifier. Active antennas require a power supply that will
contribute to the total GPS system power consumption budget with additional 5 to 20 mA typically.
If the supply voltage of the MAX-M5Q receiver matches the supply voltage of the antenna (e.g. 3.0 V), use the
filtered supply voltage
VCC_RF
output to supply the antenna. See section 4.2.2.1.
In case of different supply voltage, use a filtered external supply as shown in section 4.2.2.2
4.2.2.1
Active antenna design, VCC_RF used to supply active antenna
Figure 13 shows an active antenna design supplied by VCC_RF.
Figure 13: Active antenna design, external supply from VCC_RF (for exact pin orientation, see data sheet [1])
For recommended parts, see section 4.3.
4.2.2.2
Active antenna design powered from external supply
Figure 14 shows a design with direct externally powered active antenna.
Figure 14: Active antenna design, direct external supply (for exact pin orientation, see data sheet [1])
For recommended parts, see section 4.3.
In case VCC_RF voltage does not match with the antenna supply voltage, use a filtered external supply
as shown in Figure 14.
