AMY-5M - Hardware Integration Manual
GPS.G5-MS5-08207-A3
Preliminary
Design-in
Page 14 of 54
2.1.7
Separate supplies of 1.8 V (1.75…2.0V) and 1.4 V (1.4…3.6 V)
The dual 1.8V and 1.4V power supply the most efficient configuration to run u-blox 5 receivers (see section
2.1.3 for details). It assures stability since the sensitive RF supply is well separated from the fluctuating base band
power supply.
C
AMY-5
VDD_IO
VDD_IO 1.65...3.6 V
XTAL_IN
XTAL_OUT
V_DCDC
1.4...3.6 V
1.4V Supply
1.4...3.6 V
Backup Battery
V_BCKP
VDD_ANA
VDD_LNA
VDD_C
V_TH
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
VDD_3V
1.75...2.0 V
1.8V Supply
VDD_RF
VDD_B
(optional)
V_RESET
Connect
XTAL_IN
to GND
if no RTC used
leave
V_TH
open
Figure 6: Separate supplies of 1.8 V and 1.4 V
