J3,30DK,00,3.5 Navman Wireless, J3,30DK,00,3.5 Datasheet - Page 4

• Manufacturer Part Number: J3,30DK,00,3.5
• Description: DEV KIT FOR JUPITER 3 AND J3-30
• Manufacturer: Navman Wireless
• Type: Receiver, GPSr

Specifications of J3,30DK,00,3.5

• Frequency: 1575.42MHz
• For Use With/related Products: Jupiter 3, J3-30
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 943-1006

Jupiter 3-30
2.2 Receiver architecture
The functional architecture of the Jupiter 3-30 receiver is shown in Figure 2-1.
2.3 Major components of the Jupiter 3-30
lna(lownoiseamplifier): this amplifies the GPS signal and provides enough gain for the receiver to use a passive antenna.
A very low noise design is used to provide maximum sensitivity.
lnaswitch: this switch controls the LNA during low power modes.
Biast: this provides the voltage to an external active antenna.
BandpassSaWfilter(1.575GHz): this filters the GPS signal removing unwanted signals caused by external influences that
would corrupt the operation of the receiver. The filtered signal is fed to the RF input of GSC3 chipset for further processing.
The filter has a bandwidth of 2 MHz.
tCXo(temperatureCompensatedCrystaloscillator): this highly stable 16.369 MHz oscillator controls the down conversion
process for the RFIC block.
regulator: this dual low-noise regulator provides two outputs of 2.85 V power to the RF section and the digital IO section of
the GSC3 chip.
mainpower: primary supply voltage range is 3.0–3.6 V.
Brownoutdetector: the precision voltage detector chip senses the input voltage and resets the module in case of any drop in
the voltage. This detector chip also serves the function of power-on-reset.
or-ingcircuit: this circuit distributes the RTC/SRAM voltage from either the main voltage supply or the back-up voltage
input in order for the RTC/SRAM elements to work in low power and continuous modes. However a back-up voltage must be
connected if the device is to be shut down and expected to perform Hot and Warm starts.
Vdd_rtCregulator: supplies a regulated voltage for the RTC/SRAM cell within the GSC3 chip.
Batterypower: the back-up battery supply feeds the VDD_RTC regulator through the OR-ing circuit, and provides the power
to the battery-backed SRAM and the RTC section of the GSC3.
V_ANT
bias T
input
V
active or passive antenna
switch
LNA
LNA
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Datasheet
SAW Filter
TCXO
Figure 2-1: Jupiter 3-30 architecture
RTC crystal
LNA_EN
XTAL_IN
RFIN
VCC_RF
regulator
Controls
GPIO/
combined RF/baseband device
VDD_BB
GSC3f/LPx
UART
ports
3.0 – 3.6V in
brown-out
detector
power
SRESET
main
VDD_RTC
VDD_RTC
regulator
OR-ing
Circuit
1.9 – 3.6V
battery
power
2